INSTITUTE OF SCIENCE, PHILADELPHIA. 49 



Calcaneum — Extreme length, j^ mm. 



Depth at fore part, 32 " 



Remains of Platygofius compressiis, less complete than those above indi- 

 cated and described, from other localities, I have mentioned in " Observations 

 on the Extinct Peccary of North America," published in the Transactions of 

 the American Philosophical Society, 1856. They were from Benton County, 

 Missouri ; Augusta County, Virginia, and from Iowa. Prof Cope also 

 noticed the occurrence of remains of the same species from Tequixquiac, 

 Mexico. (Proc. Am. Philos. Soc, 1885, 15; Annales del Museo Nacional 

 de Mexico, 1886, 339.) 



Remains of a larger species, found in Mifflin County, Pennsylvania, I 

 have noticed in the Proceedings of the Academy of Natural Sciences, 1883 

 301, under the name oi Platygomis vctus. A fuller account of the same, 

 with illustrations, will shortly appear in a " Notice and Description of Fossils 

 in Caves and Crevices of the Limestone Rocks of Pennsylvania," to be pub- 

 lished in one of the reports of the Geological Survey of Pennsylvania. 

 Remains, more complete, apparently of the same species, from Guanajuato, 

 Mexico, under the name of Platygonus alcvianii, are described by Dr. 

 Alfredo Duges, with illustrations, in La Naturaleza, Mexico, 1887, page 16, 

 plates L, IL 



Prof. O. C. Marsh has given brief notices of several other species, as 

 follows : Platygoims Ziegleri, from Grizzly Buttes, Uintah Mountains, 

 Wyoming ; P. striatus, from the pliocene sands of Loup Fork River, Ne- 

 braska, and P. ? Condoni, from the pliocene beds of Oregon. (Am. Tour. 

 Sc, 1870,40,41.) 



The various remains originally described and now regarded as pertain- 

 ing to Platygonus compresstis were early attributed to nearly half a dozen 

 different species and genera, founded on slight differences, which, before the 

 prevalence of the evolution theory, were looked upon as being of a fixed 

 character and all-sufficient for the distinction of species, and were so 

 adjudged by a master who has since passed from among us. 



Of the remains described by Dr. Duges, under the name of Platygotius 

 aleinanii, in La Naturaleza, all those represented in plates I. and IL, except the 

 upper jaw with the molar teeth and the scapula, have been submitted to my 

 inspection through the Smithsonian Institution. 



The mandible with the molar teeth is an amplified repetition of that of 

 Platygonus covipressus and appears to differ only in the less backward posi- 

 tion of the condyle, which in this direction is less than the angle as in the 

 Peccaries. The angle is very conspicuously everted, is bounded by a strong 

 ridge, and is deeply concave on the outer surface. The coronoid fossa is 

 also deeply impressed. 



