162 TEETIAET VEETEBEATA OF THE FATtTM. 



The dimensions (in centimetres) of some of the above specimens are : — 



C.9094. C.9074. 0.8261. C.8315. M. 8856 a. M. 8856 6. 

 Width between outer edges of articulation 



for skull 15-5 15-5 16 15-7 15-3 15 



„ of surfaces for axis 13-5 12 13 12 12 12 



,, to ends of transverse processes . . 25-7 . . . . 25 app. 26-4 25'4 



C. 8079. Nearly complete axis vertebra. This specimen shows the large peg-lik^e^ somewhat 

 compressed odontoid with distinct ventral facets the strong hypapophysial ridge^ the 

 very high neural arch with the neural spine deeply hollowed out posteriorly by a deep 

 fossa for the attachment of ligaments. 



M. 9123. Atlas vertebra similar to last, but less nearly complete. 



M. 8857. Imperfect centrum of smaller axis. Presented hy the Egyptian Government, 1904. 



The dimensions (in centimetres) of the above axis vertebrae are : — 



0.8079. M.9123. ,M.8857. 



Length of centrum with odontoid . . 12-5 12 app. 9-5 



Width of surface for atlas 11 app. 11 app. 10 



„ posterior face of centrum . . 7'5 app. 8 



Height to top of neural spine .... 14+ 15-5 



„ of neural canal 3 3'5 app. 



M. 8513. Eight astragalus. Figured in text-fig. 52. The dimensions (in centimetres) are : — 



Width of tibial surface, including facet for internal malleolus .... 8 



,, calcaneal surfaces 8 



„ navicular surface 7'7 



Presented hy W. E. de Winton, Esq., 1903. 



C. 8355. Portion of left astragalus. 



C. 10063. Imperfect left calcaneum. 



PalsBOmastodon parvus, Andrews. 

 [Text-figs. 50 C, 55-59.J 

 1905. Pakeomastodon parvus, G. W. Andrews, G-eol. Mag. [5] vol. ii. p. 562. 



T^pe Specimen. — Imperfect right ramus of mandible, with pm. 3-4 and m. 1-3 in 

 situ (text-fig. 55) ; British Museum. 



This species is distinguished from P. beadnelli by its small sixe, but at the same 

 time it approaches that species very nearly in the comparative simplicity of its teeth, 

 particularly in the form of m. 8, and in having the posterior end of the mandibular 

 symphysis some distance in advance of the anterior premolar, a character which at 

 once distinguishes it from P. wintoni. The third molar (text-figs. 50 C, 55) consists of 

 two transverse ridges, each composed of two tubercles, and a small third ridge consistino- 



