Lint of Species. 



CARNIYOEA. 

 Ca::^is, sp. indet. 



Represented by a portion of the left ranuis''of the mandible, which 

 contains alveoli for and portions of I. 3, c. 1, and P. ni. 4. The incisors 

 are closely crowded by the huge canines, which have larger jiropor- 

 tions than dogs generally, resembling more those of the bears, or large 

 feline carnivora. The first premolar is one-rooted and separated by 

 a long diastema from the canine. The second premolar is two-rooted 

 and separated from the first by a short diastema. The third is also 

 separated by a distema from the second, which exceeds that in front of 

 the latter. Th6 fourth follows the third immediately. The mental for- 

 amina are two, one large, below the first premolar, the other smaller, 

 bat little below the alveolar margin opposite the posterior margin of 

 the second premolar. 



M. 



Length of fragment ' . . 0.175 



Length from incisors to P. 4 . 095 



Length basis of P. m. 3 017 



Length basis of P. m. 2 , 013 



Vertical diameter canine at basis 029 



Length symphysis 075 



Depth ramus at P. m. 2 047 



This large species is about as large as the Canis liaydenii of Leidy, 

 and differs from the type in the the anterior postion of the mental 

 foramina, perhaps an individual variation. It is characterized among 

 dogs, by the weakness of its premolars as much as by the strength of its 

 canines. 



Canis saevus Liedy, Anc. Fauna, Nebraska, p. 28. 



ToMAECTUS BREViEOSTRis Cope, Palcontological Bulletin, aSfo. 16, 

 p. 2. 



Maetes musteltnus, Cope, Palcontological Bulletin,* No. 14, p. 1. 

 {Aelurodon.) 



PERISSODACTYLA. 



Apiielops megalodus Cope, Pal. Bull., No. 14, p. 1. 



This large species and the A. crassus, Leidy, were very abundant 

 during the Pliocene period in Western North America. Their re- 

 mains are everywhere mingled with those of horses and camels. The 

 former, and probably the latter, is to be referred to a genus distinct 

 from both Aceratheriiim and Rhinocerus on account of the existence of 

 but three premolar teeth in the mandibular series, and probably in the 

 maxillary also. One of our specimens exhibits the missing superior 

 premolar on one side. The outer incisor below, is a large tusk, while 

 the inner is small and caducous, points in which this genus resembles 

 the genera above-named, and differs from the African and tichorhine 

 species, or genus Atelodus of Pomel. 



A posterior upper molar represents the A. cras.nts in the original col- 

 lections described by Leidy. A well developed tubercle which rises 

 from the bottom of the valley between the inner extremities of the 



* These publications may be procured at the Naturalists' Agency, Salem, Mass., or of 

 the writer. 



