. Catalogue of the fossil Reptilia and Amphibia in the British Museum (Natural history) ... By Richard Lydekker ... Reptiles, Fossil; Amphibians, Fossil. 228 CHELONIA. Family PROTOSTEGID^E. Carapace apparently represented merely by a row of marginals, but the plastron very strongly developed and composed of thick ossifications. Humerus (when known) with the radial process short, blunt, and approximated to the head. Skull at present undescribed, but, according to Baur \ approximating to that of the Chelonidce. The procoelous vertebras of the type genus,which were provisionally regarded by Cope
. Catalogue of the fossil Reptilia and Amphibia in the British Museum (Natural history) ... By Richard Lydekker ... Reptiles, Fossil; Amphibians, Fossil. 228 CHELONIA. Family PROTOSTEGID^E. Carapace apparently represented merely by a row of marginals, but the plastron very strongly developed and composed of thick ossifications. Humerus (when known) with the radial process short, blunt, and approximated to the head. Skull at present undescribed, but, according to Baur \ approximating to that of the Chelonidce. The procoelous vertebras of the type genus,which were provisionally regarded by Cope as dorsals and are described as showing indications of transverse processes, are more probably referable to the cervical region. The above interpretation of the structure of the shell is Fig. Protosphargis veronensis.—Ventral aspect of the thoracico-abdoininal region ; from the Upper Cretaceous of Italy. Ty. (After Capellini.) based on the observations of Baur2, who regards the bones provi- sionally referred by Cope to the carapace as plastral. In the form from the Upper Cretaceous of Italy described by Capellini3 as ProtospJiargis (fig. 52), the humerus is unknown, and the ribs have not the scaly expansions found in the type of Protostega. It has 1 See note on p. 223. a Zool. Anzeig. vol. ix. pp. 087-689 (1886). 3 Atti E. Ac. Line. ser. 3, vol. xviii. p. 291 (1884).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). Dept. of Geology; Lydekker, Richard, 1849-1915. London, Printed by order of the Trustees
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