9 



8 PROCEEDINGS OF THE ACADEMY OF 



and Trogosus castoridens, really belong to the same genus and 

 species. The tooth of Anchippodus riparius was obtained from 

 a tertiary formation, miocene or eocene, in Monmouth Co., N. J. 

 If the determination is correct, it would go to show that the Brid- 

 ger Tertiary formation of Wyoming was contemporaneous with 

 the Tertiary deposit of Monmouth Co., N. J. 



Prof. Cope stated that the largest mammal of the Eocene for- 

 mations adjoining those of Wyoming, i. e. of the Wahsatch group 

 of Hay den, was the Bathmodon radians, Cope, of about the size 

 of Rhinocerus. It was an odd-toed ungulate, with peculiar dental 

 characters. The incisors were well developed above and below 

 as in the Tapir, but the dental series was little interrupted. The 

 crowns of the upper molars were all wider than long, and presented 

 mixed characters. On the outer margin one only of the two 

 usual crescents of Ruminants was present, but a tubercle repre- 

 sented the anterior one. The one which was present was di- 

 rected very obliquely inwards. Inner crescents were represented 

 by two angles, the posterior forming the inner angular margin of a 

 flat table, the anterior, a mere cingulum at its anterior base. The 

 arrangement of these parts was stated to be of interest in connec- 

 tion with the relationships between the types of hoofed animals. 

 The single outer crescent was a ruminant indication, while the 

 inner table resembled the interior part of the crown of Titanothe- 

 rium. It differed, however, in its early union with the outer mar- 

 gin, its edge being thus possibly homologous with the posterior 

 transverse crest in Rhinocerus. The premolars had two or three 

 lobes with crescentic section arranged transversely. He regarded 

 the genus as allied to Ghalicotherium. 



He stated that the mammalian fauna of Wyoming and Utah 

 more nearly resembled that of the Paris Basin than any yet dis- 

 covered in our country, and that it had been discovered to con- 

 tain a still greater number of generalized mammalian forms. One 

 of the most marked of these was the genus just described by Dr. 

 Leidy. 



April 9. 



The President, Dr. Rusciienberger, in the chair. 



Sixteen members present. 



Remarks on some Extinct Vertebrates. Prof. Leidy directed at- 

 tention to some fossils upon which he made the following obser- 

 vations. Several teeth and jaw fragments from the Loup Fork of 

 the Niobrara River, Nebraska, obtained by Prof, 1 1 ay den, appear 

 to indicate a large species of Felis, not previously described. 

 The most characteristic specimen consists of an upper sectorial 

 molar about as large as that of the Bengal Tiger, and consequently 



[June 25, 



