LYSIANASSA A.UDOUINIANA. 
81 
oblong-ovate, and have the posterior margin simple. 
The caudal appendages are simple : the antepenultimate 
pair have the branches styliform, naked, slightly curved, 
and tipped with a rudimentary spine ; the penultimate 
resemble the preceding, except that the posterior margin 
of each branch has its distal moiety minutely serrated. 
The ultimate pair have the base very short, and one 
branch simple, the other two-jointed and tipped with a 
minute spine; the inner margin of the single-jointed 
branch, and the first joint of the double-jointed one, are 
minutely serrated. The central tail-piece is simple, 
squamiform, concave above, and rounded at the apex. 
The animal is of a dull yellow colour, darkest along 
the course of the alimentary canal. 
This species has been taken by us, in Plymouth Sound, 
with a dredge ; but we have not noticed it among those 
Crustacea sent to us by our many obliging correspond- 
ents from other localities. 
The species is named in honour of M. Audouin, the 
able coadjutor of M. Milne-Edwards, and who, as the 
describer of the Amphipoda in Savigny’s “ Egypt,” must 
be reckoned among the pioneers of this branch of Car- 
cinology. 
G- 
