300 APPENDIX A 



digits, but this may possibly be due to distortion in drying. 

 Tail comparatively long and thickly haired. Skull about as 

 in Urotrichus, the pterygoid region less inflated and with 

 better developed pterygoids than in Scapanus. Tympanics 

 incomplete. Interparietal broad, less tapering forwards than 

 in Urotrichus. 



Teeth | x 2 = 36, these being apparently 



As to the individual homologies of the teeth, I would 

 tentatively suggest the following as the complete formula of 

 the permanent dentition : 



I' 1 '. 2 . 0> C. J, PM. j ' Q g 4 , M. j'' 



In this the premolar formula is not very certain, since it 

 may possibly be 1 . 2 . . 4, as in the Urotrichus-Uropsilus 

 series of genera ; but I am quite confident about the lower 

 incisors, which are 1 . 2 . 0, as in Desmana and the American 

 moles, as compared with . 2 . 3 or . 2 . in Urotrichus, 

 Uropsilus, and their allies. 



The most salient points of the dentition are : (1) the total 

 number of 9 above and below, elsewhere only found in 

 Neurotrichus, and (2) the Desmana-like character of the 

 lower incisors, which are subequal, strongly proclivous, the 

 second equally with the first abutting upon and being worn 

 down by the hinder surface of the large anterior upper 

 incisors. 



P large, about as large proportionally as in Scalops and 

 Urotrichus, therefore larger than in Scapanus, but very far 

 from as large or as specialized as in Desmana and Gakmys. 

 P and p l subequal, small, the canine between them rather 

 larger, double-rooted. P 3 of about the same length and twice 

 the bulk of the canine ; p 4 about four times the bulk of p z 9 

 with a well-marked internal cusp. Molars with their internal 

 ledge subtrilobate, about as in Scapanus. 



Type. Scapanulus oweni, sp. n. 



Dividing, as I should, the family Talpidce into five sub- 

 families the Desmanince, Talpince, Scalopiiice, Condylurince, 



