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A remarkable specimen of a fine, large, sub-fossilised egg of the Aepyornis maximus, popularly known as the 'giant elephant bird', featuring a beautifully mineralised surface, with an area where the hatchling exited, expertly reattached, leaving little visible trace. 6.3 kg total, 49.5 cm high including stand, egg: 30 cm



Private collection of Professor Raniero Gnoli, located in Castel Giuliano, Bracciano, in the Province of Rome. According to Professor Gnoli, the egg was acquired by a relative in a Parisian gallery approximately a century ago.

The Aepyornis maximus was one of the largest birds to ever exist, a flightless giant reaching nearly 10 feet in height and native to the island of Madagascar. Extinct by the 17th century, this extraordinary bird has captivated human imagination for centuries and inspired numerous myths and literary works. The eggs surpass the size of any known dinosaur egg and could accommodate the volume of seven ostrich eggs, approximately 160 chicken eggs, or an astonishing 12,000 hummingbird eggs. These eggs, once common on the island, are now among the few physical remnants of this magnificent species. While the precise cause of the elephant bird’s extinction is unknown, evidence strongly points to human activity, including hunting and habitat destruction. As the bird vanished from Madagascar’s landscapes, its myth grew, merging with folklore to leave an enduring legacy that connects history with imagination. This intact egg stands as a rare and tangible link to a bygone era, offering a profound sense of wonder for a species that once roamed the earth as the largest bird in recorded history.

Ichthyosaur from the Mixosaurus genus, with several small teeth visible in the mouth, large eye sockets, many of the spinous processes present on the spine, and a large number of the flipper bones present on both the fore and hind paddles. 10 kg, 64.5 cm



From the Guanling Biota formation, China. Previously with Shishang Corporation, Taiwan. From a West London gentleman collector; acquired from a professional fossil company in Taiwan.

Originally, ichthyosaur fossils were misidentified as ‘Saurian ’-being either lizards or forms of crocodile. The term 'Ichthyosaur' was first used in 1817 by the German naturalist Karl Dietrich Eberhard Konig, and he did not publish the name until 1825. By the 1830s, the name Ichthyosaur was widely used. Mixosaurus is considered to be a transitional genus that was smaller in size than the later dolphin-like Ichthyosaurs.

Featuring the top of the skull with an exposed left eye socket and part of the lower jaw also visible, a number of the cervical vertebrae present, as well as ribs and part of the right scapula. 5.75 kg, 36 cm



From the Guanling Biota formation, China. Previously with Shishang Corporation, Taiwan. From a West London gentleman collector; acquired from a professional fossil company in Taiwan.

Originally, ichthyosaur fossils were misidentified as ‘Saurian’, being either lizards or forms of crocodile. The term 'Ichthyosaur' was first used in 1817 by the German naturalist Karl Dietrich Eberhard Konig, and he did not publish the name until 1825. By the 1830s, the name Ichthyosaur was widely used.

Pair of Keichousaurus hui skeletons on matrices prepared underneath from a ventral view; the larger male with its back legs bent towards the tail, both with exposed hip bones and scapulae. 2.89 kg total, 23-26.4 cm



From the Guizhou formation, China. Previously with Shishang Corporation, Taiwan. From a West London gentleman collector; acquired from a professional fossil company in Taiwan.

Keichousaurus was a late Triassic marine reptile, a member of the Pleurosaur family, which went extinct 250 million years ago during the Triassic-Jurassic extinction event. They were specialised fish eaters and were highly unusual amongst marine reptiles in that they gave birth to live young rather than laying eggs. The male had more pronounced ulnar bones on its front legs.

Showing a complete skeleton Keichousaurus hui shown from above with clearly defined spinous processes, the front legs tucked partially above the ribs, a curving neck and a long tail. 17.7 kg, 28.9 cm



From the Guizhou formation, China. Previously with Shishang Corporation, Taiwan. From a West London gentleman collector; acquired from a professional fossil company in Taiwan.

Keichousaurus was a late Triassic marine reptile, a member of the Pleurosaur family, which went extinct 250 million years ago during the Triassic-Jurassic extinction event. They were specialised fish eaters and were highly unusual amongst marine reptiles in that they gave birth to live young rather than laying eggs.

Complete skeleton of a small Keichousaurus hui on a rectangular matrix, shown from the ventral side with visible hip bones and scapulae, front and hind limbs shown along the body and neck curving to the left. 567 grams, 16.9 cm



From the Guizhou formation, China. Previously with Shishang Corporation, Taiwan. From a West London gentleman collector; acquired from a professional fossil company in Taiwan.

Keichousaurus was a late Triassic marine reptile, a member of the Pleurosaur family, which went extinct 250 million years ago during the Triassic-Jurassic extinction event. They were specialised fish eaters and were highly unusual amongst marine reptiles in that they gave birth to live young rather than laying eggs.

An extinct genus of diapsid reptiles, Claudiosaurus germanini, beautifully preserved and featuring a full ribcage, limbs, the majority of the tail and neck vertebrae. 7.75 kg, 40 cm



From a UK collection formed in the 1980s. Property of an Essex, UK, gentleman.

In life, the Claudiosaurus's splayed feet would have been webbed. It had a relatively long body and neck, reaching an overall length of about 60 centimetres. It is presumed to have been partially oceanic, living in a similar way to the modern marine iguana.

Showing the armoured shell of the marine arthropod on a rectangular matrix. 1.89 kg, 22 cm



From a Lincolnshire, UK, collection.

Eurypterids could grow to up to one metre in size to compete with armoured fish for food and territory.

The spine section comprising ten large dorsal vertebrae with transverse processes, various other rib sections and bones from the paddle-like flippers; on a sedimentary matrix wrapped in a plaster field jacket. 15.25 kg, 88 cm



Ex Cambridgeshire, UK, collection.

The Mosasaur is an extinct, large marine reptile with an elongated body, long snout and paddle-like limbs. Found worldwide, they competed with other well-known sea predators of the Late Cretaceous, such as plesiosaurs and ichthyosaurs, for food, existing primarily on a diet of ammonoids, cuttlefish and fish.

Large assembled section of a jaw with ten large teeth displaying dark brown patina, set on a sandstone matrix. 9.37 kg, 63 cm



From a Cambridgeshire, UK, collection.

The Mosasaur is an extinct, large marine reptile with an elongated body, long snout and paddle-like limbs. Found worldwide, they competed with other well-known sea predators of the Late Cretaceous, such as plesiosaurs and ichthyosaurs, for food, existing primarily on a diet of ammonoids, cuttlefish and fish.

Comprising two hadrosaur eggs retaining evidence of the original leathery surface and how the eggshell was crushed before fossilising. 1.56 kg total, 10.2-10.9 cm



From the Nanxiong formation, China. Previously with Shishang Corporation, Taiwan. From a West London gentleman collector; acquired from a professional fossil company in Taiwan.

Dinosaur eggs are known from about 200 sites around the world, the majority in Asia and mostly in terrestrial (non-marine) rocks of the Cretaceous Period. It may be that thick calcite eggshells evolved during the Cretaceous (145 to 65 million years ago). Most dinosaur eggs have one of two forms of eggshell that are distinct from the shells of related modern animal groups, such as turtles or birds; however, some eggs closely resemble the type of shells seen in present-day ostrich eggs.

Matrix containing the majority of two elongated Oviraptor philocerataops eggs, retaining their leathery surface. 4.82 kg, 24 cm



From the Nanxiong formation, China. Previously with Shishang Corporation, Taiwan. From a West London gentleman collector; acquired from a professional fossil company in Taiwan.

Oviraptor, or 'egg thief', was a small feathered bipedal theropod. Being omnivorous, it fed on plants, insects, eggs and fish. Famously mis-named upon its initial discovery in association with a nest of eggs in 1924, it is now accepted that the oviraptor was nesting, not raiding; palaeontologists have since discovered oviraptor in association with eggs containing fossil oviraptor embryos.