458 
C0R0PHIID2E. 
with the wrist as deeply dilated as the hand, and nearly 
of the same form. The second pair have the wrist 
longer than, and nearly twice the breadth of, the hand ; 
the antero-inferior process produced to a single point; 
the hand having the inferior margin smooth, and nearly 
parallel with the superior ; the finger is slightly curved 
and pointed. 
The female differs from the male in being a less slender 
animal : and in having the second pair of legs with the 
wrist not longer than the hand, and produced beneath 
its inferior surface, not as a strong tooth-like process, 
but as a thin plate-like projection. The hand is nearly 
round, or broadly oval, being as wide as the wrist. It is 
is in fact a perfect specimen of the supposed genus 
Dercothoe. 
Both male and female specimens are thickly sprinkled 
with small spots of black. 
We have only seen dead individuals of this species, 
and have, therefore, no positive proof that the two 
forms above described are the male and female of the 
same species. We, however, received them at the same 
time from the same locality, and our opinion has since 
received a curious corroboration in the circumstance 
that, among the specimens sent to us, for examination, 
by the Rev. A. M. Norman, one had the right hand of 
the second pair of legs developed like that of the male, 
while the one upon the left side assumed all the 
characteristics of the female organ. 
We have received specimens of this species from 
Banff, sent to us by Mr. Edward ; from Northumber- 
land, where it was procured by the Rev. A. M. Norman; 
and it is recorded by Prof. Milne Edwards as having 
been found on the coast of Brittany. 
