S-necked (Cryptodiran) Tortoise (Horuopus arcolatus), to show how the head is withdrawn by a vertical S-like curve. [Left] Side-necked (Pleurodirati) Tortoise (Stcrnothocrus niger), to show how the head is withdrawn by a lateral flexure of the neck [right]. from the book ' Reptiles, amphibia, fishes and lower chordata ' by Joseph Thomas Cunningham, Richard Lydekker, George Albert Boulenger, John Arthur Thomson, Publication date 1912 Publisher London : Methuen

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Size: 4200px × 2530px
Location: London
Photo credit: © Historic Illustrations / Alamy / Afripics
License: Royalty Free
Model Released: No

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