198 Annals of the Carnegie Museum. 



more as in Sus scrofa than in the hippopotamus, while the eyes are nearer 

 the nose, entirely unlike those in the latter forms. The upper part 

 of the neck is heavy, but the lower has not the great transverse diameter 

 seen in the hippopotamus as the angles of the lower jaws are relatively 

 much less spread, the cervical vertebrae less depressed, and perhaps 

 not as broad, consequently there was not the surface for the attach- 

 ment of the muscles of the under portion of the neck seen in the recent 

 forms. Although the shoulders appear heavy they are represented 

 as having little or no superfluous flesh as the outlines of the glenoid and 

 suprascapular borders of the shoulder blade are plainly visible through 

 the muscles. The broad thoraco-abdominal muscle is also represented 

 as quite thin. Posteriorly the models are lighter and recall the general 

 characters of the pigs rather than the ruminants. The limbs are 

 short and the feet are most nearly like those of hippopotamus. 



The epidermis is represented with little or no hair for two reasons: 

 first we have no means of knowing whether the animal had a thick 

 coat of hair like the wild boar, was more thinly clad like certain species 

 of peccaries, or whether the hair was absent as in Hippopotamus; 

 secondly, the models are represented smooth in order the better to 

 show the proportions of the different parts of their anatomy. As 

 has been stated in the introduction to this paper and also in earlier 

 publications the habitat of the animals discussed was most likely in 

 low-lying land. It is not altogether unreasonable to think that they 

 spent part of their time in marshy places, or even in the water. 



2. Promerycochoerus vantasselensis Peterson. 

 Annals of the Carnegie Museum, Vol. IV, p. 36, PI. XI, 1907. 



Type: Skull with right ramus and portions of the skeleton. Car. Mus. 

 No. 1230. 



Pa retypes: Two portions of skeletons found imbedded together. 

 Car. Mus. Nos. 1232 and 1232a. 



Horizon: Miocene (Lower Harrison beds). 



Locality: Vantassel Creek, Converse County, Wyoming. 



Specific Characters. Skull brachycephalic. Length of molar 

 series slightly increased, and space for premolars shortened, nasals 

 shorter, and anterior nares more obliquely inclined posteriorly than in 

 other species of this genus. The zygomatic arch less robust, less down- 

 wardly extended, and the tympanic bulla larger than in P. carrikeri. 



