CETPTOCLEIDUS OXONIENSIS. 193 



E. 3730 (Leeds Coll. 144). Imperfect skeleton, including skull (imperfect posteriorly, PI. IX. fig. 7), 

 atlas, axis and fifteen other cervical vertebrae, the centra of the posterior caudal vertebrse 

 still united with one another ; six ribs (cervical, dorsal, and sacral), left clavicle, radius, 

 ulna, and the greater part of one fore paddle, together with a number of odd bones of 

 the other ; distal halves of both femora, tibire, fibulte, and the greater part of the other 

 bones of both hind paddles. 



The skull (PL IX. fig. 7) is very much broken and is incomplete posteriorly ; the 

 upper and lower jaws are crushed together and it can be seen that the long sharp teeth 

 of the upper and lower series alternated throughout : there are about 24-25 lower 

 teeth on each side. In the cervical region the sutures between the centra and the neural 

 arches and ribs are still open. The terminal caudals do not seem to have borne ribs, but 

 the neural arches and chevrons were present on all but the last, or perhaps two last 

 vertebrse, although in this specimen they are for the most part represented only by the 

 facets for their attachment. 



The skull is too much crushed to give any reliable measurements. 



The dimensions (in centimetres) of other parts of this specimen are : — 



Tx , , Atlas and Anterior Middle 



VertebriTe - i ■ ■ 



axis. cervicals. cervical. 



Length of centrum in mid-ventral line .... 4-2 2'6 ax^p. 3*5 3'5 app. 



Width of posterior face of centrum ...... 3'0 3'1 4'5 5-3 



Height oE posterior race of centrum 2-3 5'5 4'1 app. 



Trie length of the united centra of the ten posterior caudal 



vertebi'iE 14'9 



Clavicle : length of outer horder 21'3 



„ symphj'sial border (:il'P-) 13'1 



Radius : length of preaxial border 14-1 



„ humeral border 15-2 



Femur: width of distal expansion 20'1 



Tibia : length 6'5 



width 9-2 



Pibula: length 54 



width 8-6 



E. 2412 (Leeds Coll. 31). A great part of the skeleton of a large adult individual. The parts 

 preserved are : — eighteen cervical vertebrce, mostly with fused arches and ribs (text- 

 figs. 79, 80), two pectorals, a dorsal, two sacrals (text-fig. 83), and twent3--two caudals 

 (text-fig. 84) ; ribs, abdominal ribs ; shoulder-girdle somewhat imperfect, especially 

 posteriorly, and with only portions of the clavicles preserved ; right fore paddle (text- 

 fig. 90, C), left ulna, incomplete pelvis wanting one ilium, hind paddles wanting some 

 tarsals and phalanges. This specimen is the type upon which Professor Seeley founded 

 the species Cryptocleidus ijlatymeriis : he figured the shoulder-girdle, clavicles, and fore 

 paddle in Proc. Roy. Soc. vol. li. (1892) pp. 145-148, text-figs. 13-15, the genus (or, as 

 Professor Seeley in some places calls it, subgenus) Cryptocleidus being founded for its 

 reception. The shoulder-girdle differs from those of R. 2616 and R. 2860 in being a 

 little narrower and more lightly built, although the size and degree of ossification of the 



2c 



