100 THE EXTINCT PECCARY OF NORTH AMERICA. 
but the remains are not distineuishable in anatomical character from the corresponding 
parts of the recent Arciomys monax, Pseudostoma bursarius, Lepus sylvaticus and Arvicola. 
A list of the Dicotyline remains which have been obtained at Galena, is given in the con- 
cluding portion of this paper. 
Of other remains of the Peccary, Dr. R. W. Gibbes obtained a small fragment of the 
lower jaw with a canine tooth, described by Dr. Le Conte, from Benton Co., Missouri, 
where it was discovered in association with the remains of the Mastodon. 
Recently, Dr. Le Conte presented to the Academy of Natural Sciences, a small fragment 
of the lower jaw containing the last temporary molar tooth, of the extinct peccary, from 
Augusta County, Virginia. 
Through the kindness of Professor Wyman, I have lately had the opportunity of exa- 
mining a number of remains of the extinct peccary, discovered in Iowa, by Dr. Foster. The 
remains consist of one half of the lower jaw with the canine and molar teeth, the upper 
jaw with the molars, and a malar bone of an adult animal, together with fragments of the 
skull of a very young animal. 
Upon the observed varieties of structure in the first collection of remains of the extinct 
peccary, obtained through Mr. Snyder of Galena, and described by Dr. Le Conte, were pro- 
posed the names of Platygonus compressus, Hyops depressifrons, Dicotyles depressifrons, Proto- 
choerus prismaticus. Upon asmall fragment of the lower jaw with one canine tooth of the 
same extinct species of peccary, from Benton Co., Missouri, also described by Dr. Le Conte, 
the name of Dicotyles costatus was proposed, and upon the cave head from Kentucky, de- 
scribed by myself, the name of Huchoerus (Protochoerus macrops) was proposed. All these I 
am now inclined to believe belong to a single extinct species of peccary, and must be included 
under the name of Dicotyles compressus, unless the anatomical characteristics, which have 
been given in detail in my former memoir on the Extinct Dicotylinz of America, should be 
considered subgeneric, when the original name of Platygonus compressus must represent the 
whole of those which have been employed. Al! the points of variation in the different speci- 
mens described in the memoir just referred to, find their corresponding equivalents in differ- 
ent individuals of the recent Dicotyles torquatus, and therefore cannot be allowed to retain 
the value that we too hastily had given them. 
The extinct Dicotyles compressus, was a little larger than the existing Dicotyles labiatus, 
andits other most important differences from this and the more common species, D. torquatus, 
chiefly observable in the skull, are briefly as follows. The face is more prolonged and nar- 
rower, the upper outline of the head is less inclined from the horizon, the forehead is much 
broader, the cheeks deeper, the orbits have a more supero-posterior position, the sides of 
the mion are less oblique, the technical angle of the lower jaw is strongly everted and the 
