PLESTOSATJRID^. 171 



arches, which are of the type mentioned above. In this 

 respect they accord with the description of the cervicals of 

 the type, and are therefore referred to this species. 



Purchased. About 1840. 



R. 1321. Five imperfect cervical vertebrae of similar type cemented 

 together by matrix ; from the Marls tone (Middle Lias), 

 locality unknown. The characteristic contour of the 

 arches and the position of the neural spine is well shown ; 

 while the characters of the centra distinguish them from 

 Plesiosaurus. The identity in their mineral condition 

 and the nature of their matrix with that of the next 

 specimen indicates their geological horizon. 



Presented by C. Faulkner, Esq. 



16059. An immature and rolled dorsal vertebra ; from the Marlstone 

 of Bugbrook, Northamptonshire. The dimensions of the 

 centrum are: — length 0,030 (1*2 inches), height 0,054 

 (2-15 inches), width 0,052 (2-05 inches). In the extreme 

 shortness of the centrum this specimen differs from the 

 dorsals of all species of Plesiosaurus and agrees with those 

 of T. cramptoni. Purchased. About 1840. 



R. 1369. An imperfect right scapula probably belonging to this 

 form ; from the Upper Lias, probably of Northampton- 

 shire. This specimen is of the general type of the 

 corresponding bone of T. arcuatus, although presenting 

 well-marked specific differences in the contour of the 

 glenoidal extremity. iVo history. 



33098-9. The proximal extremity of a humerus or femur and an 

 associated radius or tibia, probably belonging to this 

 species ; from the Upper Lias of Whitby. These speci- 

 mens are much smaller than the corresponding bones of 

 T. cramptoni, and would apparently accord with those of 

 the present species. Purchased. About 18(>0. 



33115. Four imperfect caudal vertebrae and some phalangeals, 

 cemented together by matrix, and probably associated 

 with the preceding ; from Whitby. In the shortness of 

 their centra these bones agree with the caudals of 

 T. megacephalus. Two of the chevrons are in position. 



Purchased. About L860. 



