ROCINELA. 289 
ISOPODA, AGIDA, 
NORMALIA. 
Genus—ROCINELA. = (Leach.) 
Generic character. Jyes very large aud convex, converging 
anteriorly and nearly uniting in the middle of the forehead, 
which is produced into a conical point concealing the base of 
the upper antenne; first and second joints of the latter 
cylindrical and much more slender than those of the lower 
antennz, which are nearly one-third of the length of the body. 
As our generic and specific descriptions are made from 
Dr. Leach’s original type of R. Danmoniensis (the only 
species which he inserted in the genus), we are able to 
ascertain that M. Milne Edwards has misconceived 
Leach’s views (which is not indeed surprising, as the very 
short and unsatisfactory descriptions given by the latter 
would scarcely afford a definite idea of its characters). 
We consequently find that the genus thus named in M.. 
Milne Edwards’s great work consists of species of Aiga, 
with the eyes confluent and the basal joints of the upper 
antenne rather more slender than in the typical Age ; 
but when we take into consideration, that the front of 
the head in Leach’s type is produced into an obtuse 
conical point projecting over the base of the upper an- 
tenna, which are much more slender than the base of the 
lower antenne, the latter being also more than one-fourth 
of the length of the entire animal; that the pleon is as 
wide as the pereion, the anterior segment being, however, 
very short, and abbreviated at the sides, which neverthe- 
less terminate in an acute point; and that the three fol- 
VOle ll. U 
