32 Bachmari^s Observations 



a white streak commencing on the forehead and extending 

 along the snout. 



The specimen of Mr. Townsend is labelled, " Banks of the 

 Columbia River, May 9th, 1835 ;" that of Mr. Nuttall was, I 

 believe, obtained in the same locality. 



In the upper jaw, the incisors are large, and a third higher 

 than the false molars which immediately follow them. These 

 are succeeded by three small teeth of a nearly conical shape, 

 increasing in length from the first to the third. The fourth 

 false molar on each side is the smallest, the fifth is a little 

 larger in size, and slightly compressed, the sixth still larger, 

 and has a considerable posterior projection. The four poste- 

 rior grinders, or true molars, are much larger and higher than 

 the anterior ones. The first of these is rather small, and has 

 two lobes with a small internal tubercle; the second and 

 third are the largest, and nearly resembling each other, exhib- 

 iting three distinct points, two external and posterior, one 

 anterior, the external ones being the longest; the last grinder 

 is the smallest and of a triangular form. 



In the lower jaw are two very small incisors in front. Next 

 to these are two of a considerably larger size, which, although 

 regarded as incisors, are nearly of the same shape and appear- 

 ance as those which come next to them. The false molars 

 are six on each side, of nearly the same size and inclining 

 forward. The three true molars which succeed, are large, 

 nearly of the same size, and although smaller, correspond 

 with those in the upper jaw. 



3. S GALOPS Breweri. Bach. Brewefs Shrew-mole. 



Characters. Brewer's Shrew-mole. Glossy cinereous 

 black above, brownish beneath. Palms narrow. Tail flat, 

 broad and hairy. 



Through the attention of my friend Dr. Brewer, an indus- 

 trious and intelligent naturalist of Boston. I am enabled to 

 present a new and very distinctly marked species, to which I 

 have attached the above name. The specimen was found by 

 Dr. L. M. Yale, at Martha's Vineyard, an Island on the coast 

 of New England. 



