42 ORCHESTIID^. 





m. 



merous, and differ slightly in shape. The 



whole structure is dotted with granular 

 markings, but no trace of the original 

 cell-formation is apparent. 



The hairs, which are scattered over the 

 legs, thougli formed upon the same plan as in Talitrus, 

 terminate in a slight, but sharp point ; and the small 

 secondary branch has a peculiar bead-like appearance. 



The habitat of this animal is along the coast, between 

 the ordinary high water-mark and that of spring-tides. 

 In places where it is found, it appears to be more abun- 

 dant than the Orclhestice. 



It is of a dark green colour, and, when dead, may 

 easily be distinguished amongst many others by a metallic 

 lustre. 



We have received specimens from Penzance, sent to 

 us by Mr. George Barlee and Mr. W. Webster; from 

 Moray Frith, by the Rev. Geo. Gordon ; from Falmouth 

 and Tenby, by Mr. W. Webster; and have taken them 

 ourselves on the shores of Plymouth Sound. 



As it was from this species that our knowledge of the 

 genus was first obtained, we named it originally after the 

 illustrious American carcinologist, by whom the genus 

 was founded ; but, upon further examination, we believe 

 it to be identical with Amphithoe Nilssonii, of Rathke, 

 and which he first regarded as identical with Amphithoe 

 Prevostii of Edwards. 



