301 
PAL.EOSYOPS LEIDY, AND ITS ALLIES. 
Appendicular Skeleton. 
Scapula. (PL XIII, figs. .37, .38). — There are a number of fragments of 
scapulm in the collection, the best example being No. 10,277, which I refer to this 
species. Only the lower half of the scapula is well preserved, the suprascapular 
region being wanting. The part preserved is characterized by its breadth and 
massiveness. The glenoid cavity is deeply concave from before backward and anter- 
iorly it is limited by the hook-like projection of the anterior border. Viewed from 
below, the outline of the glenoid is very different from that of Tapirus and more 
closely resembles that of Rhitioceros. In the latter form tlie outline of the glenoid 
is a broad oval, being about erpial at both ends. In Tapirus Indictis the middle 
dimension of the glenoid is the greatest, whereas in P. paludosus it forms an elon- 
gated oval. The coracoid jirocess in this species is rather short, stout and strongly 
recurved ; internally it is separated from the glenoid border by a deep notch. The 
form of this part of the scapula is very different from that of recent Perissodac- 
tyles, where the coracoid is not separated from the glenoid border by an interval 
as in the Rhinoceros, but rises directly from it. In recent Perissodactyles the cora- 
coid is sejiarated from the glenoid border by quite a long interval ; in the Tapir 
and Rhinoceros this process is short, and is not incurved. 
Eqmis has a small and incurved coracoid process. The anterior border of the scap- 
ula in P. paludosus is thin and concave above this process ; then it becomes strongly 
convex, its superior border having been probably rounded and convex as in Rhi- 
noceros. The anterior border is not divided by a coraco-scapnlar notch as in the 
Tajiir and some sjiecies of Rhinoceros. The posterior border is slightly concave and 
probably formed a rounded angle with the suprascapula border. 
At the lower part of the posterior border, and separated from the glenoid by a 
slight notch, is a large rugose tuberosity. This is oval in outline and forms a prom- 
inent character in the scapula of this species. In the Tapir and Rhinoceros this 
tuberosity is wanting. The neck of the scapula is only slightly marked off, and is 
concave on each side below the origin of the spine. The spine arises on a line with 
the upper end of the tuberosity ; at its origin it is very broad and heavy. The 
spine forms a right angle with the glenoid cavity. 
From the scapula of a form closely allied to Palceosyops, in which the spine is 
provided with a recurved process, I conclude that in this species the scapula sjiine 
was also thus pu'ovided. The internal face of the scapula is nearly smooth, showing 
only a slight longitudinal convexity. In comparison with that of the Tapir the 
whole plane of the scapula is strongly incurved. 
Htmierus, No. 10,373. — There is in the collection only a distal part of a humerus 
which I can refer to this species. This humerus was not associated with the 
rest of the skeleton of P. paludosus, but was found in the same locality. The 
distal portion represents probably about one-half of its entire length. The shaft 
of the bone is unusually heavy compared with that of the allied genus Limno- 
hyops. The upper portion show's the distal prolongation of the deltoid ridge. 
