MAMMALS --SORICINAE SOREX COOPERI. 



27 



3. TJiird and fourth upper premolars nearly equal and rather smaller than the two anterior ones. 



SOREX COOPERI. 



Sorex cooperl, BACHMAV, J. A. N. Sc. Phil. VII, 1837, 388 ; pi. xxiv, fig. 7. 

 AUD. & BACH., N. A. Quad. Ill, 1854, 311, (from preceding.) 

 ? Jlmphisorex lesuerii, DUVERNOY, Mag. de Zool. 1842, mam. 33, pi. 50. 

 Sorex lesueri, WAGNER, Suppl. Schreb. V, 1855, 54, in dark pelage. 



SP. CH Very slender and small. Ears rather large, nearly as long as the adjacent fur. Longest hairs on back about one and 

 a half lines. Feet slender but moderately long ; tubercles on sole large and distinct ; fore feet contained nearly twice in the 

 hinder, which are about f ths the length of skull. Width of skull rather less than half its length ; palate more than f ths 

 this length. Tail nearly as long as head and body, well pencilled at the tip. Third upper premolar tooth above equal to 

 the fourth. Premolars not imbricated. Anterior upper incisor with an inner lobe in contact with its fellow. 



Color above, light chestnut-brown ; beneath, pale-brownish, or chestnut white. Length, mostly under two inches. Tail, 

 1}$. Hind foot, 0.46 of an inch. 







Body small and slender; snout elongated, acute, well provided with bristles. Ears large, not 

 projecting, however, beyond the fur ; well coated with hair on both sides, except around the 

 meatus. Feet moderate. Hands contained about one and two-third times in the feet, which 

 have the three middle toes lengthened so that the first claw does not reach the penultimate 

 articulation of the second toe ; and the fifth claw just attains to the penultimate articulation of 

 the fourth toe. The soles are very naked, and exhibit a large tubercle on the base of all the 

 toes, and another on each side behind these ; they are so arranged as to present two on each edge 

 of the sole. The tail is moderately stout, cylindrical, somewhat enlarged in the middle, and 

 well covered with long hairs lying flat, and forming a decided brush at the end ; including hairs, 

 it is pbout \\- the length of head and body. Fur on the back measuring nearly two lines. 



The prevailing color above is a light chestnut brown ; beneath, brownish white, or very light 

 chestnut white, as are the under surface of the tail, and the feet. 



The muzzle is elongated and very slender ; the dental formula \ -f" ^ + :: The anterior 

 upper incisor has a well developed basal hook, larger than usual, and coming down to the line 

 tangent to the larger hook and the lateral teeth ; this basal or posterior hook, is as large as the 

 first two lateral teeth, which are equal, and larger than the next two, which are also equal ; the 

 fifth is very diminutive. The lower anterior incisor has three lobed serrations. All the teeth 



are chestnut at the tips. 



List of specimens and measurements. 



