1894.] NATURAL, SCIENCES OF PHILADELPHIA. 447 



completely disappeared, the suborbital portion of the maxillary ter- 

 minating in a rounded surface. The infraorbital foramen is very 

 large and occupies the usual position above P^ and 5^. In advance 

 of p4 the muzzle is quite sharply constricted and narrowed. The 

 palate is quite deeply vaulted and concave transversely ; between the 

 molars of the two sides it is broad, but narrows rapidly in front of 

 them. No foramina or failures of ossification are visible in the 

 palate. The posterior nares have a similar shape and position to 

 those of Sorex, but differ in the raised and thickened front border. 

 The anterior portion of the muzzle is slender and tubular and the 

 narial opening is small and terminal. The horizontal ramus of the 

 mandible is proportionately stout and bears a single conspicuous 

 mental foramen beneath the first molar. Condyle and angle are 

 missing. 



In the upper jaw the crowns of the anterior teeth are broken away, 

 leaving only the fangs. The first incisor was large and compressed 

 like that of Sorex, but it is impossible to determine whether it had 

 the basal cusp found in that genus. This is followed by four minute, 

 single-fanged teeth, the homologies of which are doubtful. The last 

 premolar is as large as, though much less complicated than a molar; 

 it resembles the corresponding tooth of Sorex, but the internal cusp 

 (deuterocone) is relatively less expanded and basin-shaped. The 

 molars have the same construction as in Sorex; the last molar is 

 much the smallest of the series, though less reduced than in the 

 modern genus. 



The large lower incisor has lost most of its crown, but it w'ould 

 appear to be less entirely procumbent than in Sorex. Behind this 

 tooth come four minute and closely crowded teeth, with compressed, 

 chisel- like crowns, of which the first and the fourth are slightly 

 larger and more prominent than the others. As in the upper jaw, 

 the molars are like those of Sorex. 



Measurements. 



Length of upper dental series, exclusive of 1st incisor JNI. 0.009 



" " molar series .... .004 



" lower dental series, exclusive of incisor . .007 



" " molar series .... .005 



Length of palate . . . . . • .010 



Breadth of palate at 5^ .004 



