CRUSTACEA. 
115 
The present species may be referred to that sec- 
tion of the genus in which M. Edwards places 
those species which have a crest on the upper side 
of the hands, as well as on the four posterior pairs 
of feet. 
Genus Etisus, (Edwards.) 
E. laevimanus. Mus. Acad. 
Testa transversa, polita, nodosa, margine obtuse 4-den- 
tata; fronte produeta, vix sinuata; manibus hevigatis, tarsis 
tuberculosis. 
Carapax one-half broader than long, not very 
convex, anteriorly and antero-laterally divided by 
several grooves into large but little elevated tuber- 
cles; margin with four large obtuse teeth; front 
produced, almost imperceptibly sinuous; hands 
smooth ; pincers very large ; posterior feet short, a 
little flattened, nearly smooth, except toward the 
last joint, which is somewhat rough, and the tarsi, 
which are studded with small tubercles. Color 
yellowish ; length of carapax from T s „ of an inch to 
rather more than an inch. 
Two male specimens, brought by Mr. Nuttall 
from the Sandwich Islands. 
In form it is much like the Lagostoma, described 
above, but the position of the antennae sufficiently 
distinguish it. Moreover, the tubercles of the cara- 
pax are greatly depressed, and the body is less 
broad, and less depressed behind, in which respect 
it disagrees also with the Cancer inequalis? (Sa- 
vigni, Egypt.) 
