N0.232S. PLEISTOCENE VERTEBRATES IN UNITED STATES-— HAY. 135 



Family CROTALIDAE. 



CROTALUS ATR0X7 Baird and Girard. 



Plate 10, fig. 2. 

 In the collection are about 50 vertebrae, most if not all of tliem 

 belonging to one crotalid snake ; also a few ribs and one poison fang. 

 The vertebrae indicate a very large serpent. They have been com- 

 pared with a skeleton of Crotalus adamanteus in the United States 

 National Museum, which was about 6 feet long in life. One of the 

 fossil vertebrae (pi. 10, fig. 2), presenting dorsal and hypapo- 

 physial spines, is slightly larger than any in the skeleton referred to. 

 From the extremity of one spine to the other is 29 mm.; measured 

 between lines parallel with the body, 27 mm. The poison fang 

 attached to the maxilla belonged to a much smaller snake, but 

 probably of the same species. There is also a left ramus of the 

 mandible, minus the dentary. 



MAMMALIA. 

 Family DIDELPHIDAE. 



DIDELPHIS VIRGINIANA Kerr. 



Of the Virginia opossum there have been secured a supraoccipital 

 bone ; two lower canines, a right and left, probably of one individual ; 

 an atlas and a fifth cervical ; a right humerus, lacking both extremi- 

 ties ; and the upper half of the left tibia. These have the catalogue 

 number 9224. 



Family BOVIDAE. 



BISON, sp. indet. 



An indeterminable species of the genus Bkon is included in the 

 collection made by Mr, Schuchardt. It is represented by a single 

 lumbar vertebra (Cat. No. 9225). It is heavy and thoroughly fos- 

 silized. 



Family ELEPHANTIDAE. 



MAMMUT AMERICANUM (Kerr). 



Plate 10, fig. 8. 



In the collection sent by Mr, Schuchardt is the anterior end of 

 what appears to be a hindermost milk molar of this species. It 

 presents two transverse crests, which are wholly unworn (Cat. No. 

 9226). The owner of the tooth was a quite young mastodon. 



In the collection is a left tibia (pi. 10, fig. 8, Cat, No. 9227) 

 which is regarded as belonging to a young animal of this species. 

 Both epiphyses are wanting, and the inner condyle is broken off. 



