470 
COROPHIIDiE. 
the typical species, a circumstance which in some 
measure may be due to the specimen being a female. 
The first pair of legs are wanting in one specimen. The 
second are small, having a long, oval, simple hand, and 
short curved finger. The third and fourth pairs of legs 
are short, and have the thighs dilated, and the fingers 
short and curved ; the branchial sac is as long as the 
incubatory flabellum attached to the same appendage. 
The fifth pair of legs have the coxa broad, the thigh 
short, the meta-carpus and wrist short, and posteriorly 
dilated, considerably broader than long ; the hand ovate, 
tapering, and the finger short, triple-pointed, and curved. 
The sixth pair of legs are longer than the fifth, and 
more simple in character, while the seventh pair are the 
longest and most simple. The penultimate pair of 
caudal appendages are the shortest ; the ultimate ter- 
minating in a double-hooked branch. The middle tail- 
piece is of a tubercular form, and covered with numerous 
small sharp teeth or spines. 
Dredged by Mr. Joshua Alder, on the Northumber- 
land coast. It lives in small cylindrical mud tubes, 
attached to branches of Antennularia . Its colour 
appears to be yellow, blotched with patches of white. 
