PELONEUSTES PHILAKCHTTS. 63 



teeth on each side of the syrnphysial region, which, moreover, remains about the same 

 width throughout (text-fig. 27, B). P. evansi also seems to have attained a greater 

 size, and various other differences between it and the present species are noted below. 



R. 3318. A nearly complete skeleton, the parts preserved being skull, mandible, twenty-one or 

 twenty-two cervical (text-figs. 17-19), two or three pectoral, twenty dorsal, and twenty- 

 eight caudal vertebrae, ribs (cervical (text-fig. 20), dorsal and ventral), scapulae (text- 

 fig. 21), coracoids (text-fig. 21), humeri, ilia (text-fig. 24), pubes (text-fig. 24), right 

 ischium (text-fig. 24), right femur. This skeleton, with the pelvis and paddles restored, 

 is mounted in the Gallery of Fossil Reptiles ; it is described and figured in the Geol. 

 Mag. [5] vol. vii. (1910) p. 110, pi. xii., and a restoration of it is now given (text- 

 fig. 26, p. 61). 



Some approximate dimensions (in centimetres) of this specimen are : — 



Skull : length from occipital condyle to tip of snout .... 55 - 7 



approximate transverse diameter of occipital condyle . 4 - 

 width between the outer ends of the lateral rami of the 



pterygoids 15 - 5 



length of the posterior interpterygoid vacuities . . . 6 - 6 

 width between outer angles of quadrates (exaggerated 



by crushing) 29-0 



Mandible : length 67'6 



„ of symphysis 21-4 



distance to which splenial enters symphysis . . . 10-0 



Vertebrae : 



Cervicals and pectoral 3. 



Length of centrum iu mid- 

 ventral line 2'3 



Width of posterior face . . 4-5 



Height to top of neural spme. 9-S 11-8 12-4 13-0 13-3 15-5 15-0 14-4 12-8 



Cervical ribs (text-fig. 20) : 



length 3-8 



width of articular bead l - 3 



height of articular head 2 - 3 



Coracoid (text-fig. 21, A, C) : 



greatest length (from antero-internal to postero-external 



angle) 47'0 



greatest length, parallel to long axis 46*5 



least width of the postglenoid portion 20*2 



width at posterior angle of glenoid cavily 243 



length of glenoid surface (approx.) 7'0 



„ scapular surface (approx.) 3'5 



* Pectoral. 



5. 



7. 



9. 



11. 



18. 



19. 



21. 



22*. 



2-6 



2-6 



2-7 



2-8 



3-2 



3-3 



33 



3-3 



6-1 



7-1 



1-5 



1-5 



2-1 



2-6 



