324 



veys of Wyoming and Montana. In the report on Montana, published in 

 April, 1872, the characters of the genus arc succinctly stated. Pateo- 

 syops is described "as an odd-toed pachyderm, with the skeleton con- 

 structed nearly as in the tapir. The thigh-bone possesses a tliird tro- 

 chanter. The hind feet nearly repeat the construction of those of the 

 tapir. The skull, with its large temporal fossae, high and thick sagittal 

 crest, concave occiput, broad, convex face, resembled that of the related 

 Palaeotherium. The teeth also agree in number and nearly in constitu- 

 tion with those of that animal. The number of teeth altogether appear 

 to .have been 44, consisting of 3 incisors, 1 canine, 4 premolars, and 3 

 molars to the series on each side, above and below. The teeth in each 

 jaw form a nearly unbroken arch, intervals existing only sufficient to 

 accommodate the passing of the points of the large and bear-like canines. 



"The true molars have a resemblance to those of Palaeotherium. In the 

 crowns of the upper true molars the inner constituent lobes are 

 more completely isolated from the outer ones than in that genus, and the 

 bottoms of the transverse valleys are proportionately of less depth. T//e 

 last vpper molar of Palceosyops. has hut a single lobe to the inner part of 

 the a'oio7i. , 



"In Palasotherium, the large premolars have the same form as the true 

 molars, but are quite different in this respect in Palasosyops. In tlie 

 iormer the crown of the upper premolars, except the first, is composed 

 of four lobes, as in the succeeding molars. In Palasosyops the first pre- 

 molar has a conical crown, the second a bilobed crown, "and the third 

 and fourth have trilobed crowns. 



" The canines of Palaeosyops arc proportionately as large and of the same 

 form as in the bears " 



In an article in the American Journal of Science, 1872, V, published iu 

 advance July 22, 1872, Professor Marsh, after remarking that the type 

 of the genus Palaeosyops is too imperfectly known to determine its more 

 important characters, adds that, "in some ' specimens which agree best 

 with the original description of paludosus, the last upper molar has tiro 

 inner cones^ and to this group tlie name Palaeosyops may in future be 

 restricted. Tlie other specimens have but a single infernal cone on tie 

 last upper molar, and for the genus thus represented the name Limno- 

 hyus is proposed." 



