OCR Text |
Show 8 MR. G. A. BOULENGER ON CHELONIAN REMAINS. [Jan. 6, 88 millimetres. Owing to the less advanced age of the specimen, the notch between the head and the external tuberosity does not exist; this notch I also find feebly marked in the skeleton of the not full-grown Dermochelys coriacea preserved in the British Museum. The fossil specimen is broken just above the radial process, but the outer posterior tubercular prolongation of this process, so characteristic of Proximal portion of left humerus of Eosphargis gigas. £ nat. size. the Athecae, is well preserved, and agrees strikingly with the fio-of Psephophorus rupeliensis given by Dollo \ with which the type-specimen of Eosphargis gigas also agrees, as stated by Lydekker2. _ In Eosphargis, as in Psephophorus rupeliensis, the intertubercul'ar pit is close to the radial border of the humerus, whilst in Psephophorus scaldii and in Dermochelys it is nearly equally distant from either border. The whole shape of the humerus of Psephophorus scaldii approaches so much nearer to Dermochelys that it appears to me questionable whether it is correct to refer P. scaldii, in the absence of any information as to the cranial and exoskeletal characters, to the genus Psephophorus rather than to Dermochelys. 1 Bull. Mus. Belg. v. 1888, pi. iv. fig. 7. 2 Cat. Foss. Rept. hi. p. 220. |