12 
U. S. P. R. R. EXP. AND SURVEYS—ZOOLOGY—GENERAL REPORT. 
Measurements of No. 629. 
Inches. 
Lines. 
Measurements of No. 629. 
Inches. 
Lines. 
Head to occiput_____ 
0 
11 
Longest toe from base_ 
0 
3 
Head to root of tail _ _ 
2 
2 
Skull, length_ 
0 
10 
Tail to end of bone_ 
2 
10 
Skull, width___ 
0 
Tail to end of hairs* - ... 
3 
0 
Length of palate_ 
0 
Fore foot from wrist_ , _ 
0 
4J 
Width of upper jaw___ 
0 
Hind foot from heel__ 
0 
9* 
Shull. The skull of this species is remarkably slender and attenuated anteriorly ; the greatest 
width of the upper jaw being but half that of the cranium. The dental formula is— 
Anterior incisors, ; premolars, ^ ; molars, ^ = 32. 
The upper anterior incisor is long and curved, with a distinct hooked tubercle near its base on 
the inferior edge ; this is a miniature of the larger hook at the end of the tooth. The two suc¬ 
ceeding teeth are of equal size, and considerably larger than the basal tubercle just mentioned, 
which indeed is about as large as the fourth of the lateral teeth; the third tooth is less than the 
fourth, itself less than the first two ; the fifth, as usual, is very small, and wedged in between 
the fourth and the first molar. The lateral anterior teeth all overlap each other in an imbri¬ 
cated manner. The lower anterior incisor has two tubercles in its middle region, just anterior 
to the next succeeding tooth, and a faint rounded notch midway between the most anterior 
tubercle and the tip. All the teeth have the points of a dark chestnut, occupying less than 
half of the anterior incisors. 
This species, in some respects, comes very near the Sorex fimbripes of Bachman, but may be 
at once distinguished by the much longer tail, which is nearly one-half longer than the body, 
instead of being decidedly shorter. In S. fimbripes the body is inches, the tail If. The 
dental formula is probably the same, as the sixth 1 ‘ lateral incisor ’ ’ of Bachman was probably 
the basal fang of the large anterior incisor. The hind feet are also much longer (9^ lines 
instead of 6). The coloration appears quite similar in the two species, and both probably 
belong to the same genus. The geographical distribution of the species is very different—one 
occurring in Washington Territory, the other in Pennsylvania. 
List of specimens. 
.Catalogue 
Corresponding 
Locality. 
Whence obtained. 
Nature of specimen. 
number. 
No. of skull. 
629 
1,780 
Fort Vancouver, W. T. 
Dr. J. G. Cooper.. 
Skin from alcohol. 
} Fur between two and three lines long. The first four measurements taken before skinning. 
