CAMPECOPEA. 433 
ISOPODA. SPH #ROMIDA. 
NORMALIA. 
Genus—CAMPECOPEA. (Leach.) 
Generic character. Oval and very convex ; sixth segment of 
body entire, or armed with a single long tooth in the middle 
of its hind margin ; articulated ramus of the uropoda forming 
a long exserted curved plate: interior division obsolete, or very 
minute. ; 
THE species of this genus are the smallest in the pre- 
sent family. They have the body very much arched, and 
capable of doubling itself closely up, but not into a perfect 
ball. The sixth segment is larger than the seventh (and 
in some individuals, which we regard as males, it is very 
much enlarged), and produced in the middle of its 
posterior margin into a long tooth, which extends back- 
wards over the tail, but varying in length in individuals 
according, probably, to the period of their growth. This 
remarkable tooth, not having been represented by 
Montagu, has been overlooked in the descriptions of the 
genus and its species by Desmarest and other later 
writers, although originally mentioned by Leach in the 
‘Dictionnaire des Sciences Naturelles.” The seventh 
segment of the body is very short, as is also the basal 
division of the tail, whereas the terminal division of the 
latter is of large size, rounded behind, entire, and armed 
at each side with the greatly elongated, curved, lateral 
appendages, the outer division of which is setose, and 
the inner appears to be obsolete, or very minute. ‘The 
foot-jaws have the intermediate joints produced into 
rounded lobes at the inner apical angles. The antenne 
are cylindrical, with the basal joints thickened. 
MO. ire BE 
