98 
Generic Charatters.—Dental formula: i. 2-2; ¢. 4:4; pm. £4; m. $4—S2== 
44, ‘Teeth of both jaws, anterior to last premolar (excepting the broad 
anterior upper incisors), are of nearly equal size, conical, the upper ones 
with the points rounded off; the lower more compressed, and with the 
points more acute. The premolars increase in diameter from first to 
third, though of equal length; the fourth is much larget, and triangular in 
section. Hxternally, thereis a small acute lobe on the anterior edge of each 
premolar, and on all the molars close to the base of the crown; a similar 
lobe on the inner edge of the corresponding teeth of lower jaw. The 
molats are in close contact ; the teeth of upper jaw anterior to molars are 
separated by diastemata. Lower incisors nearly equal; second not larger 
than the first. The nostrils are near the end of the muzzle, either lateral 
or superior. ‘The tail is more or less hairy. 
SCAPANUS BREWERI (Bach.) Jordan. 
Hatry-TAILED MOLE, 
1843. Scalops brewert, Bachman, Proc. Bost. Soc. Nat. Hist., i, 1841, 41.— 
Ib., Bost. Journal Nat. Hist., iv., 1848, 32.—Waegner, Weigman’s 
Archiy., 1843, ii, 31.=-Ib., Suppl. Schreb., v, 1855, 5738.— Aud. & 
Bach., N. A. Quad., ii, 1851, 173, pl. i, xxiv. 
1857. Scalops (Scapanus) brewert, Baird, Mamm., N. A., 1857, 68. 
1876. Scapanus brewert, Jordan, Manual Vertebrates, 1876, 25; 2d Ed., 
1878, 25. 
Specific Markings.—A specimen in alcohol measured 1.65 inches from 
tip of nose to occiput, 4 inches tc root of tail; tail 1.05 inches; tail te 
end of hairs 1.25 inches; length of hand .72 inch; of foot .75; breadth 
of palm .55inch. The body is rather more slender than Scalops aquaticus. 
The head is rather pointed and elongated, owing to the great develop- 
ment of the muzzle, which projects about one-third of an inch beyond 
the incisors. The muzzle is depressed, tapering to a rounded truncate 
tip. There is a broad groove on the under side from the incisors to the 
bulb of the nose, which is terminal and smooth. The remainder of the 
muzzle is wrinkled and corrugated. Nostrils open on the sides of the 
terminal bulb; they are slightly visible from above, but not from be- 
neath. The eye is minute and covered with skin; it is a little back of 
the angle of the mouth, and midway between the tip of the snout and 
the occiput. There is no external ear; the auditory opening is an oval 
cavity about one-twelfth of an inch in diameter, situated just above the 
insertion of the arm. The tail is thick and blunt at the end, entirely 
and densely covered with rigid hairs about one-sixth of an inch long. 
The third finger is longest; the second about the same size, but not as 
