35 



jor. The cingula are much less developed. The angle of the 

 lower ramus is much longer. The zygoma is massive and 

 wide. An internal process on the glenoid cavity. Temporal 

 fossae very deep. Crest of occiput nearly in same vertical 

 line as occipital condyles. 



The full details of P. paludosus, which follow, may seem 

 somewhat unnecessary, to one familiar with the comprehen- 

 sive work of Dr. Leidy upon the subject. Care has been 

 taken not to retrace any of his steps ; and the descriptions 

 given below are of those parts of the animal which he did 

 not possess at the time of writing. They include (i) a 

 cranium perfect posterior to the orbits ; (2) a right ramus 

 mandibuli, with full dentition, except the first premolar ; (3) 

 portions of the fore-limbs, scapula, and pelvis, pes and 

 manus, and many fragments of other parts. 



Among the first discoveries on Cottonwood Creek, in a 

 stratum of fine green sand, was a head of P. paludosus, com- 

 plete posteriorly, and broken off just behind the orbit. A 

 rear view of this has been admirably figured in Plate I. 



General appearance. The base of the cranium is of great 

 width ; the occiput is high, inclined very slightly backwards, 

 and deeply concave from side to side. The forehead is tri- 

 angular and narrow. The temporal fossa is of immense size 

 and depth, leaving a small intracranial cavity. The zygomas 

 are heavy, and arching widely outwards give this part of the 

 head a strong resemblance to the Felidce. 



Description in detail. The narrow but prominent basi- 

 occipital segment is broadest posteriorly and tapers forwards ; 

 divided by a median ridge, which expands anteriorly into a 

 large tuberosity ; a feature also characteristic of the tapir. 

 About half an inch in advance of the condyles are the con- 

 dylar foramina. The condyles are formed of the ex-occipitals, 

 which are low and of great lateral expansion. Their junction 

 with the mastoids is marked by a large foramen. The par-oc- 

 cipitals are short and styliform. The supra-occipital region is 

 very large, high, and deeply concave from side to side, much 

 wider than in the tapir, with a marked interparietal suture. 

 The condyles are wide, but not very deep, approaching each 

 other very closely below. The basisphenoids are long and nar- 

 row, tapering forwards. The alisphenoids are mutilated, but 



