PLESIOSATJEID^. 165 



ulna are : — length 0,138 (5*4 inches), breadth 0,095 (3*7 

 inches), length of chord of anterior concavity 0,99 (3*9 

 inches) ; and those of the fibula : — length 0,102 (4'0 inches), 

 width 0,082 (3*25 inches), length of chord of anterior 

 concavity 0,050 (2*0 inches). The disproportion in the 

 size of the ulna and fibula is thus strongly shown ; the 

 former bone is comparatively long and narrow. The tibia 

 is very small. Hawkins Collection. 



2061*. Fragment of rock containing an anterior cervical vertebra 

 {Fig.) and a radius ; probably from Street. The vertebra is 

 represented in fig. 56, p. 159. The radius has a length 

 of 0,127 (5*3 inches), and is longer than the corresponding 

 bone of T. megac&phalus. This specimen probably belongs 

 to the same individual as the preceding. 



Hawkins Collection. 



2047*. A laterally crushed anterior cervical vertebra, probably 

 associated with the preceding. Hawkins Collection. 



R. 1319. Slab showing two teeth and two imperfect ribs; probably 

 from Street. The larger tooth resembles the teeth of No. 

 R. 1318. These bones may also have belonged to the same 

 individual as the preceding specimens. 



Hawkins Collection. 



Of the folloiviug specimens some may belong to the next species. 



R. 1320. An imperfect left scapula probably belonging either to this 

 or the next species ; probably from Street. A large part 

 of the ventral surface is wanting, This specimen agrees 

 generally with the corresponding bone of No. R,. 1317, but 

 presents slight differences which may be specific. 



No history. 



R. 1323. The crown of a tooth in matrix ; from the Lower Lias, 

 locality unknown. This specimen appears to accord with 

 the broken tooth in No. 2030*, and also agrees in size with 

 the teeth of the type of T. megacephalus, and since it is 

 of larger size than those of other Lower Liassic Sauro- 

 pterygians, the reference to the present or the next species 

 is very probable. The crown is much curved, with fine 

 ridges on the inner concave side, while the outer convex 

 surface is nearly smooth ; tho latter character agreeing 

 with Stutchbury's description of the teeth of the Bristol 

 skeleton of the next species. No history. 



