458 



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. 



