plesiochelyidj:. 199 



44178 y. A second or fourth neural bone ; from Weymouth. 



Purchased, 1878. 



44178 z. A sixth or seventh neural bone : from Weymouth. 



Purchased, 1878. 



43570. The head of a humerus, probably referable to the present 

 or an allied genus ; from the Kimeridge Clay of Wey- 

 mouth. This specimen agrees generally with the cor- 

 responding portion of the humerus of Parachelys, but in- 

 dicates a larger specimen, and is widely different from the 

 type of humerus referred to the Acicheh/idce. 



Purchased, 1871. 



Plesiochelys, sp. 



Known only by the plastron, which is fully ossified and of the 

 elongated form characteristic of P. solodurensis, but with the anal 

 shields confined to the xiphiplastral, although extending higher than 

 in P. hannoverana. Of large size. 



Hah. Europe (England). 



21351 x. Slab exhibiting the dorsal aspect of the left hyoplastral ; 

 from the Purbeck of Swanage, Dorsetshire. 



Purchased, 1847. 



23407 x. Slab exhibiting the ventral surface of the right hypo- 

 and xiphiplastral: from the Purbeck of Swanage. The 

 areas occupied by the plastral and inframarginal shields 

 are clearly shown. This specimen probably belongs to 

 the same individual as the last, since it was purchased 

 from the same dealer. Both specimens exceed in size 

 the largest example of P. solodurensis figured by Eiiti- 

 meyer. Purchased, 1849. 



R. 1315. Slab exhibiting the ventral aspect of a left hypo- and 

 xiphiplastral agreeing closely with the preceding specimen ; 

 from the Purbeck of Swanage. No history. 



Plesiochelys valdensis. Lydekker 1 . 



Apparently allied to the Lower Kimeridgian P. sanctce-verena?. 

 Eiitimeyer-, but with the vertebral shields relatively narrower. 

 Plastron wide and fully ossified, with the sulcus dividing the abdo- 



1 Quart. Journ. Geol. Soc. vol. xLy. p. 239 (1889). 



a N. Denkschr. schw. Ges. Sat. vol. xxv. art. 2, p. 30, pi. xiii. (1873). 



