228 SAUEOPTERTGIA. 



by a prominent ridge, and the base of the neural canal hour-glass- 

 shaped. Dorsals without haemal ridge. Humerus and femur (fig. 70) 

 long, and articulating distally with three bones. 



This species was founded upon the undermentioned pelvic limb 

 from the Portlandian of the Isle of Portland ; vertebrae from the 

 same beds, some of which probably belong to the same individual as 

 the type, are identical with those from this locality described as 

 Plesiosaurus ivinspitensis, and also with those from the Portlandian 

 of Quainton, Buckinghamshire, to which the name P. carinatus was 

 applied. Oimoliosaurus hiangulatus was founded upon vertebrae 

 from the Portlandian of Tisbury, Wiltshire, which are probably of 

 the same type. The French specimens figured by Sauvage are 

 likewise Portlandian. 



Hab. Europe (England and Erance). 



The following specimens are from the Portland Oolite {Upper Jurassic) 

 of the Isle of Portland, Dorsetshire, and it is probable that a 

 considerable number belong to a single individual. 



41238. The imperfect centrum of a posterior cervical vertebra. The 

 length is 0,030 (1*16 inches), the vertical diameter of the 

 terminal face 0,032 (1*25 inches), and the transverse 

 0,041 (L'6 inches). It closely resembles the type cervical 

 of P. carinatus figured in Phillips's ' Geology of Oxford,' 

 p. 375, fig. 175, and agrees in relative size with the 

 pelvic limb No. 40640. Purchased, 1868. 



45904. The centrum of a larger posterior cervical vertebra. 



Purchased, 1876. 



41238. Two nearly entire middle cervical vertebrae, cemented to- 

 gether by matrix. In the hinder one the nearly entire 

 arch is preserved. The centrum is relatively longer than 

 in the preceding specimens, its length being 0,039 

 (1-55 inches), and the height of the anterior face 0,038 

 (1*5 inches). These specimens, except for their somewhat 

 smaller size, cannot be distinguished from the cervical 

 from the same beds figured by Seeley in the ' Ann. Hag. 

 Nat. Hist.' ser. 4, vol. viii. pp. 182, 183, under the name 

 of P. ivinspitensis ; showing the same forward overhang of 

 the upper part of the centrum, the median pit in the 

 terminal faces, and the inferior carina. The dimensions 

 of the centrum of the above-mentioned specimen are : — 

 length 0,051 (2 inches), height 0,048 (1-9 inches), and 

 width 0,061 (2-4 inches). Purchased. 



