62 
U. S. P. R. R. EXP. AND SURVEYS-ZOOLOGY-GENERAL REPORT. 
The Scalops aquaticus differs in several important respects from the species with 44 molars, in 
addition to its having but 36 teeth and other peculiarities. The muzzle is rather broader and 
more obtuse than in S. townsendii, although the position and character of the nostrils are similar. 
The eye is more anterior, and the ear is much smaller. The palms are much broader in pro¬ 
portion ; in fact, with the claws, the dimensions of length and breadth in S. aquaticus are about 
as they are without them in S. townsendii. The latter species lacks the projecting angle of the 
inner side of the palm, and the hand is more deeply split between the fingers. The hind foot 
is shorter and broader at the toes ; the web extends much further along to the claws. The tail 
is shorter and more thinly clothed with hair. 
Compared with S. breweri, the lateral nostrils, the very thick and densely black-haired tail of 
the latter, constitute striking features of distinction. The eye of S. breweri , also, while similarly 
situated, is covered by an extension of skin, through which the ball is visible, instead of being 
concealed. The meatus, too, is much larger than in S. aquaticus; the palms are much smaller 
and narrower in proportion; while smaller than in S. townsendii, their shape and amount of 
webbing are much as in the last mentioned species, strikingly different from S. aquaticus. 
The species is much more closely allied to S. argentatus, the article on which I refer to, for the 
distinctive peculiarities. 
List of specimens. 
Catalogue 
number. 
Corresponding 
No. of skull. 
Locality. 
When 
collected. 
Whence obtained. Nature of 
specimen. 
870 
1374 
2213 
51 
2193 
158 
2172 
2203 
2192 
831 
Middleboro, Mass_ 
July 22,1855 
May 22,1832 
J. W. Jenks. 
Dry skin - . 
Raynor Beach, N. J_ 
W. Cooper_ 
Wethersfield, Conn_.... 
C. Wright. 
Alcohol_ 
Skin 
956 
Carlisle, Penn_ 
S. F. Baird. 
Washington, D. C_ 
Alcohol_ 
Skin. 
1140 
Clark county, Va_ 
Dr. Kennerly___ 
Spottsylv&nia county, Va_..._ 
A. W. Massey_ 
Alcohol - - - 
Jackson, N. C_ 
Rev. F. Fitzgerald_ 
Society Hill, N. C. 
Rev. M. A. Curtis _ . _ 
do 
Abbeville, S. C__-_ 
Dr. Barratt_ __ 
Skin. 
967 
Columbus, Ga-__ 
Dr. Gesner_ 
In alcohol. 
Skin. . 
49 
1624 
2465 
2195 
2204 
2215 
33 
160 
2215 
Savannah, Ga_ ____ 
R. R. Ouyler 
St. Simon’s Island, Ga. ____ 
Dr. Wilson--- 
_ _ do 
In alcohol. 
Alcohol_ 
Indian River, Fla_--------- 
G. Wurdemann__ 
Jacksonville, Fla--_------ 
Dr. A. J. Baldwin __ __ 
Eutaw, Ala_ _ __ 
Prof. A. Winchell . 
do 
944 
1142 
Kemper county, Miss__ 
Washington, Miss-__ 
D. C. Lloyd. 
Skin._ 
Col. Wailes 
_ do._ 
Blount county, Tenn_ 
Prof. Mitchell 
