200 Wortman — Studies of Eocene Mammalia in the 



does not exhibit very clearly the number of incisors, but in 

 others which agree with it very closely, the number is three. 

 The first premolar is two-rooted and is placed close behind the 

 canine, without diastema. All the other premolars are likewise 

 implanted by two roots, and are much crowded in the jaw. 

 The fourth has a distinct posterior, but no anterior basal cusp. 

 The crowns of all the premolars are rather thick from side to 

 side, and the cusps are inclined to be obtuse and rounded. 

 The two subequal molars, of which the first is preserved in the 

 specimen, have the following characters : A moderately ele- 

 vated trigon, with a large external and smaller internal and 

 anterior cusps ; a moderately well-developed shear, and blade- 

 like modification of the external and anterior cusps ; and a 

 medium-sized basin-shaped heel. These two teeth are nearly 

 equal in size, the last being a little the larger. The jaw is 

 shallow vertically and thick from side to side. The symphysis 

 is enlarged and extends to beneath the middle of the third pre- 

 molar. There are two mental foramina, the larger of which 

 issues beneath the anterior border of the second premolar. 

 The coronoid is rather large and the angle is not inflected. 



In one specimen a considerable 

 74 ^ part of the skull, Plate VI, together 



with certain parts of the skeleton, are 

 preserved, from which the following 

 characters may be stated : The face is 

 rather short ; the orbital cavity is 

 relatively small ; there is a distinct 

 postorbital process and a sagittal crest 

 of moderate proportions ; there is ap- 

 parently no anterior glenoid process, 

 but a distinct postglenoid foramen ; 

 the mastoid is well exposed upon the 

 postero-lateral wall of the skull, but 

 the position of the stylomastoid fora- 

 men cannot be ascertained ; the troch- 

 lear surface of the astragalus, figure 

 74, is moderately grooved and there 

 Figure 74. -Astragalus and is a distinct astragalar foramen, of 

 calcaneum of Limnocyonverus about the same size and position as 



Marsh ; front view ; three seen { n t } iat f t l le ot ter ; the fibula is 



ia ]SuRE 75.— Fibula of Lim- little reduced and has a considerable 

 nocyon verus Marsh ; end contact with the calcaneum, figure 75,. 

 view; showing articular sur- as j n the otter ; the calcaneum has a 

 *Sre?Z&a*r '' ^ moderately short tuber, a broad bus- 



tentaculum, and a prominent calcaneal 

 tubercle ; there were apparently five toes in the hind foot, and 

 the phalanges were elongated, being but little shorter than 

 those of Zutra. 



