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. Theeye 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 | Corresponding | Locality. When Whence obtained. Nature of 
number. No. of skull. collected. specimen. 
ait) es eS eee Middleboro, Mass.------------- July. 22,0855 |. W. Jenks <2. - nc aeo ns Dry skin -. 
IBIAS © leon Beanens ae Raynor Beach, N. J=..--.=---.- Maly +22, 28d2i0| AW: COODCl ana ee eee =m OSs ee 
VA] (3 Nil je aa Oe eee rere | Wethersfield, Conn.-.-----.---|-------------- Ch Wright==- sen =s oo noes Alcohol ... 
51 O50 ol Camhble, Pensa o.c- 44 — Aint cee Los coe ae BW Waled.2-c et eee Skin.....- 
PIGS let. = con eee | ‘Washing ton) DMCs c8 onsen eee eee) oe ee es a le ee Alcohol --. 
158 1140 Clankncounty, Vidian ob amet eee ee Dre Kennerlye ena = eene= es Skin: 2 2ee 
PN PO 4 eae SEE Sea Spottsylvania county, Va--..-.-|.---------...- Aso... Massey 2.222 sues Alcohol .-. 
P74 5 yeni \ inc ala Una Mo awn (5 (CREE SES ASA) oa ca|6 HR Sse ese Rey... F., Witzgerald.--—.. =.= One eet 
WLG2) | |saaseaccsaen ce (eso Gini hl LON (Ce SSeS SSeS SSeS Rey, WEA. Curtis) = coon ocae == dOseas= 
Sot) eses cee eee | Yelle] Sh et LEMS Op eS S Se ee eS ee Dr. Barratt: ----- eno Skin. seas 
ee See ae 967 Columbus) Gan-a-s-pacccenesen|=pe=-asa=s—=--| Dr. /Gesner —.--2e----— ene) Ue ee 
PES eee a me SAVANNA) Gime ne ee te ee eee Sete ie eee R. Re Cuylerss2 See Skin. yoo. 
tf 2: Sages gece = ie ae St. Sumon's7sland Ga. —= =. =s.-) 2.5. * eS ie Dr, Wilkon ose see ae eee Bae one tS 
PA Total ek oe eS oe ee se oe (SSS See eae Es serene so [eae Ol eee nee In alcohol. 
PAU aa a ae Niel lana Reta ees ete ee reel eee G. Wurdemann ..-..------ Alcohol -.. 
Af Korean oye ees aes Jacksonville, -Mla ns a2 i - soem | Sa = ei Dr, A.) J. Baldwin, = 2.5 23-255 00- Scene 
22 riggs Salant Buty, Wtheke aaat no contol ac ee Prof. A. Winchell...------- ie a 
33 944 | Kemper’county, Miss. co sae aono|eo= wee oe 1K CS abi hea Ee ee She Skin. oer 
160 1142 Washing ton) Miksoh Seen acce an) Renee tem aaees GolmWellesacn sacs as oo oer =-2d08e-2e— 
BASIN MES. SS IFSSSS Blountcounty, Venn 22. sea eee nee son een nee Prot Mitchell, SO ee ae 
