128 
CRUSTACEA. 
them are produced quite upon the sides, in such a 
manner as almost to project from them ; the margin 
presents only one tooth, which forms the outer 
angle of the orbit, and is quite stout, median im- 
pression of the carapax and lateral furrow on each 
side of it very profound ; front moderately inclined, 
and not greatly prominent, divided into four quad- 
rate lobes flattened above, frontal edge nearly 
straight, or lightly sinuous ; hand only moderately 
large in the male and small in the female, more or 
less rough; four posterior pairs of feet polished, 
nearly smooth ; tarsi moderately long, and termi- 
nated by a long, slender, corneous nail; the third 
joint of the outer maxillary feet is much rounded on 
the outer side, and apparently somewhat concave. 
The color varies, hut is usually yellow and brown 
mingled, minutely dotted with black; legs paler, 
dotted with black. Sometimes the whole body is 
pale yellowish or clay colored. 
Length about 14 inches. 
The females seem to be more numerous and 
smaller than the males. 
Several specimens, brought by Nuttall and 
Townsend from the west coast, near the mouth of 
the Columbia river, and from the Sandwich Islands. 
Genus Plagusia, (Latr.) 
P. pianissimo,, (Cancer pianissimo,, Herbst.) 
(P. clavimana , Desmarest.) Mus. Acad. 
Brought from the Sandwich Islands by J. K. 
Townsend, but is larger than usually represented, 
being about l T 6 o inches in length. 
