OCR Text |
Show 1905.] DINOSAUR CETIOSAURUS LEEDST. 2 3 5 Sacrum. The sacrum is known only by the neural spines (text-fig. 39, p. 233), of which it seems possible to identify four. Each spine is strengthened on its lateral face by an irregular vertical ridge of bone, and is sharply truncated at its upper end. Three are fused together into one plate and (from analogy with a corresponding arrangement in Diplodocus) may be regarded as belonging to the three anterior sacral vertebrae. The fourth spine is placed separately just behind the composite plate. Caudal Vertebrce. Of the four anterior caudal vertebras preserved in the new specimen, shown in text-fig. 39, p. 233, the two foremost are too much Text-fig. 41. Cetiosaurus leedsi.- Anterior caudal vertebra; anterior and (A) left lateral aspects. az., prezygapophysos ; 1., broken lateral flange of bone ; tr., transverse process, incomplete. About ^ nat. size. broken to display many of their characters. As mounted, indeed, the neural spines are hypothetically ascribed to the centra beneath them. The centra are very short and slightly broader than deep, each bearing traces of transverse processes placed rather low on |