DICOTYI.INI OF AMERICA. 33i 



probably of that above. They were found under circumstances similar to those aln 

 ribed, but in another locality fifteen miles distant. 



The three teeth probably belonged to the same individual, which had passed the middle 

 of adult life, as the specimen of the first true molar, which is about the size of that of the 

 collared Peccary, has its characteristic triturating surface nearly obliterated. 



The most characteristic specimen is the fragment of the last molar (PI. 37, fig. IS), 

 which in outline resembles more the lower than the corresponding upper tooth of the 

 Peccary, hut its proper position has been rather determined by comparison with the teeth in 

 the cave head. In the robustness of its lobes it approaches more that of Platygonus than 

 that of the Peccary, and from their prominent prismoid character the specific name which 

 has been applied to the animal is quite appropriate. Its admeasurements are as follow: 



Estimated autero-posterior diameter, - - - - - 10 lines. 



Breadth at middle, 6 " 



The first true molar measures six lines antcro-posteriorly, and four and three quarter 

 lines in breadth. 



The inferior canine was rather smaller than that of the cave head, and it evidently be- 

 longed to an old individual, as the enamelled portion of the crown is worn away to a l< : 

 of about sixteen lines, while the remaining portion of the fang, about ten lines Ion . 

 somewhat gibbous, and is solid, except a pulp canal in the centre about half a line in dia- 

 meter. In section the fang is oval, but impressed posteriorly. The external and inter- 

 nal fires of the crown are smooth and com 



It is not possible at present to determine whether the teeth ascribed to Protochcertis 

 do not belong to the same animal characterized from a cranial fragment under the na 

 of Dicotyles depressifrons. If they should be proved hereafter to do so, then both the 

 teeth and cranial fragment must fall back info the genus Hyops, previously proposed I > 

 Protochosrus, for the posterior molar tooth described of the latter evidently is generically 

 distinct from that of the recent Dicotyles. 



Dicotyles costatus was established by Dr. Le Contc from a fragment of the symphysis 

 of the lower jaw in connexion with the right inferior canine tooth. The specimen was 

 found in Benton county, Missouri, in a ociationwith bones of I ion. The i 



is larger than that of Dicotyles labiatus, and the anterior margin of the crown is i 

 acute than m any of the specimens of recent Dicotyles which have come under my not 



nner side is smooth and convex, and its outer side presents a prominent longitudinal 

 ridge, from which the Bpecies is named, but which is sometimes even better developed in 

 the Dicotj les torquatus. 



Tli neii probably indicates a species larger than cither of those existing. 



irements. 



( - r namelled crown of the inferior canine, lim , 



- ler, - - . . - 7 •> 



();1 tlir> oc ;:i »val of the collection of Mammalian Remains deposited 



the Am. rican Philosophical , in the cabinet of the Academy of Natural S 



