1886.] NATURAL SCIENCES OP PHILADELPHIA. 275 



upon its new conditions in large numbers, and with the purpose 

 of making its new home a permanent one. 



There is no record of the species having been found north of 

 South Carolina before. 



Toxodon and other Remains from Nicaragua^ G. A. Prof. 

 Leidf directed attention to some fossils, and remarked that they 

 were part of a collection which he had been invited to examine 

 b}^ Mrs. Dr. B. F. Guerrero, now residing in this city- The collec- 

 tion was obtained from the northern part of Nicaragua, but 

 nothing further had been learned about it. It mostly consisted 

 of uncharacteristic fragments of bones, but among them were 

 many interesting specimens referable to Megatherium, Elephant, 

 Mastodon, Horse, Ox, Toxodon, and Capybara. The association 

 of these animals is another illustration of the extension of the 

 early South American quaternary fauna into North America. 

 Among the remains of Ilegatheriinn there is the greater part of 

 the distal extremity of a femur and a fragment of the mandible 

 with two teeth. Of the Elephant there is a portion of a molar 

 tooth. Of the Mastodon there is a molar tooth and portions of 

 several others apparently of the M. andium. Of the Horse there are 

 two upper molar teeth, with no well-marked difference distinguish- 

 ing them from those of ordinarj' varieties of the Domestic Horse. 

 Perhaps they may pertain to one or other of the species indicated 

 by Prof. Owen with the names of Equiis curvidens or E. tau. Of 

 the Ox, the collection contains several horn-cores of different 

 sizes; one, double the size of that of the Domestic Ox. 



The Capybara is indicated by a fragment of the left ramus of 

 a mandible with the first molar alveolus containing the greater 

 part of the tooth. The specimen conforms to the corresponding 

 portion of the jaw of the living Cap3bara, but indicates a con- 

 siderably larger and more robust animal. Considering the dif- 

 ference in size and age of the fossil, it was 

 probably a different species from the Cap}- 

 isara, and regarding it as such he proposes 

 for it the name of EydrocJwerus 7^obustiis. 

 The first molar tooth complete would have 

 the appearance represented in figure 1, and, 

 ^- except in size, does not differ from that of 



the Capybara. Comparative measurements of the fossil are as 

 follows : 



Depth of mandible at ^irst molar, 

 Length of first molar. 

 Fore and aft diameter, 

 Transverse diameter of last dental 



|H3.tG^ 



Diameter of incisive alveolus, . 

 Dr. Lund, in his Fossil Fauna of Brazil (An. Sc. Nat., 1839, 



H 



