398 GAMMARID.E. 



similar in this respect, monodactyle. Natatory fins long, 

 divided, and beautifully ciliated. Caudal processes three 

 pairs, long, with aciculate branches. Two rather long 

 conical spinous processes [the two divisions of the middle 

 tail-piece] terminate the tail ; and above these are two 

 much smaller papillEe. 



" Hab. Amongst confervse in pools left by the tide ; 

 not rare near Berwick." 



Dr. Johnston questions whether it belongs to the 

 same genus as Pherusa fucicola, Leach, with which at 

 first he thought it was identical. 



" In the figure of Ph. fucicola, in the Supplement 

 to the Encyclopaedia Britannica, the second joint of the 

 superior antennas is represented as elongated, the first 

 pair of feet or arms filiform, without any hand, and the 

 hand of the second pair oval, with a very small claw. 

 There is also a considerable difference about the tail, the 

 Pherusa having no terminal conical processes." 



Dr. Walker, of Birkenhead, informs us that he has 

 taken specimens, which he considers to belong to this 

 species, occasionally off" the mouth of the Mersey, and 

 along: the coast to Dee. 



