261 



like most of the other fossils accompanying them, are thoroughly saturated 



with bitumen. 

 * 



The most characteristic specimens consist of two isolated episterna, repre- 

 sented in Fig. 7, Plate IX. They indicate an animal about the size of the 

 recent Emys scabra of the Southern States, but the bones are proportionately 

 more robust than in that species. They abruptly project in advance of the 

 lateral grooves defining the gular scutes, and are squarely truncated. The 

 upper gular surface is nearly square, and slopes forward to an acute edge. 

 In one specimen it is wider fore and aft than transversely; in the other rather 

 less. Behind the gular surface, the bone is deeply hollowed into a concavity. 



The measurements of the specimens are as follows: 



Lines. 



. Width of episternal at the front border. . . 10 



Length of internal border I 12 



Length of posterolateral border . . . | 12 



Greatest thickness of the bone 5J 



A hyposternal bone about the middle is 28 lines fore and aft, 26 lines wide 

 behind the inguinal notch, and half an inch where thickest internally. 



The fore part of a nuchal plate of the carapace resembles the correspond- 

 ing portion in Emys scabra, but is more deeply indented. Its width in front 

 is an inch; the length of its median ridge is 10i lines; and its thickness where 

 greatest is half an inch. 



F I S H E S* 



The following species of extinct fishes were first described by the writer 

 in the Proceedings of the Academy of Natural Sciences of Philadelphia for 

 June, 1870. The specimens were borrowed for my examination from a 

 gentleman of New York, by my friend Mr. George N. Lawrence, of the 

 same city. The locality of the specimens was not ascertained other than 

 that they came from the Rocky Mountains. They were accompanied with 

 some shells, evidently of the later Tertiary period, and also with a coronary 

 bone, apparently of Equus excelsus. The fish-remains consisted of eight 

 detached pharyngeal bones of a cyprinoid. and a single dermal bone of. a ray. 



Subsequently, while a notice of these fossils was in press, the writer 

 received from Professor Hayden a pharyngeal bone of the same species and 

 appearance as the former, which was labeled "Castle Creek, Idaho." 



