198 dlELONIA. 



This is the commonest species found in the Lithographic Lime- 

 stone. 



Hah. Europe (Germany). 



R. 289. The imperfect left hyoplastral; from the Lower Kimerid- 

 gian limestone of Bavaria. The visceral surface of this 

 specimen agrees precisely with that of the corresponding 

 part of the specimen figured hy Riitimeyer in the ' N. 

 Denkschr. schw. Ges. Nat.' vol. xxv. art. 2, pi. x. fig. 2 ; 

 while the contour of the shields on the ventral surface is 

 similar to that obtaining in the shell figured in pi. xii. of 

 the same memoir. The greater part of the preaxillary 

 portion is broken away. 



Egerton Collection. Purchased, 1882. 



Plesiochelys hannoverana (Maack l ). 



Syn. Stylemys hannoverana, Maack 2 . 

 Plesiochelys hannoverana, Portis 3 . 



Carapace very wide, with the neurals shorter than in other species. 

 Plastron moderately wide, fully ossified, rounded at both extre- 

 mities, with the sulcus dividing the abdominal and femoral shields 

 ascending in a bold curve on the hypoplastrals, the postinguinal 

 lobe short, and the anal shields confined to the xiphiplastrals. The 

 form of the inframarginals is not shown. 



Hah. Europe (Hanover). 



R. 297. Cast of a slab of rock showing the ventral aspect of the 

 nearly entire plastron. The original was probably ob- 

 tained from the Lower Kimeridgian Lithographic Lime- 

 stone of Hanover. The epi- and entoplastrals are want- 

 ing. This specimen accords closely with the entire plastron 

 figured by Portis in the ; Palseontograpbica,' vol. xxv. 

 pi. xvi. fig. 7. Egerton Collection. Purchased, 1882. 



Plesiochelys (?), sp. 



The following specimens apparently belong to one or perhaps 

 more species of Plesiochelys, which may be identical with Conti- 

 nental foims. 



44178 x. The first neural bone ; from the Kimeridge Clay of Wey- 

 mouth, Dorsetshire. Purchased, 1878. 



1 Palreontograplu'cn, vol. xviii. p. '322 (1869).— Stylemys. 



2 Loc. cit. : < Ibid. vol. xxv. art 3, p. 131 (1878). 



