174 CHELONIA. 



present writer, in the ; Geol. Mag.' dec. iii. vol. iv. 

 p. 275, this shell is evidently specifically identical with 

 the smaller specimen represented in pi. xxviii., which is 

 the type of Emys delabechei, the latter specimen having 

 probably now perished through pyritons decomposition. 

 The present specimen shows the presence of mesoplastrals 

 placed as in Podocnemis; the matrix has been chiselled 

 away in order to exhibit the anchylosis of the ischium and 

 pubis to the xiphiplastral. If not referable to the present 

 genus, this specimen should be placed in Podocnemis as a 

 species differing from the others in the contour of the ver- 

 tebral shields. Bowerbank Collection. Purchased, 18H5. 



Genus TAPHROSPHYS, Cope 1 . 



This genus, which may be identical with the earlier Bothremys 

 of Leidy 2 , occurs typically in the Upper Cretaceous of New Jersey, 

 and is described as being closely allied to Podocnemis. In the skull 

 on which Bothremys was founded there is, however, a distinct 

 vomer. 



In the American forms the humerus seems to be unknown ; the 

 type specimens are described by Cope in the ' Trans. Amer. Phil. 

 Soc' vol. xiv. pt. i. p. 157 et seq. (1870). 



Taphrosphys ?, sp. 



The following specimen indicates a form somewhat exceeding in 

 size the largest specimen of Podocnemis expansa in the collection of 

 the Museum, and apparently indicates an allied form which, from 

 its geological horizon, may probably be referred to the present 

 genus. 



Hob. New Zealand. 



It. 73. The imperfect right humerus ; from beds of Upper Cretaceous 

 age in New Zealand. The head and the whole of the 

 distal extremity are wanting, but the upper part of the 

 ectepicondylar groove still remains. In the contour of 

 the proximal portion, as well as in the constricted shaft, 

 which is almost narrowed into a ridge on the posterior 

 aspect, this bone agrees so closely with the humerus of 



1 Amer. Nat. vol. iii. p. 90 (1869). 



2 Cretaceous Keptiles of United States (Smiths. Coutrib. Jvnowl. vol xiv. 

 art. 6), p. 110(1865). 



