556 A HISTORY OF RECENT CRUSTACEA 
loped to be regarded as larval forms. It is very singular 
that they are devoid of the last pair of pereeopods. Apart 
from this extremely distinctive feature 1t might be sup- 
posed that the species belonged to the genus Olencira, with 
the somewhat variable type-species of which it agrees in 
having a very small ‘palp’ to the maxillipeds, the hinder 
legs very elongate, with long curved nails, and the pleon 
narrow, with a subtriangular termination. It differs in 
having no eyes. 
Codonophilus, Haswell, 1881, is placed by its author 
among the Cymothoide, in Dana’s subfamily Avgathoine, 
and the type-species, Codonophilus argqus, Haswell, is said 
to approach Avgathoa, Dana. ‘The mandibles have the 
‘palp’ elongate. The maxillipeds are small, operculiform, 
three-jointed, the small basal joimt probably not being 
reckoned in. The uropods have a single ramus which is 
falciform and carries a few scattered cilia. By the single 
ramus of the uropods this genus would seem to approach 
the family Spheromide. 
Family 4.—WSerolide. 
The body is strongly depressed ; the broad head is 
united, with or without a suture, to the first segment of 
the still broader perzon. The seventh segment of the 
perzeon is without side-plates, this and sometimes also the 
sixth being dorsally fused with the pleon with or without 
suture ; ventrally also these two segments are more or less 
closely united. The side-plates of the sixth segment are 
the longest. The pleon consists of three small free seg- 
ments and a large terminal composite one. ‘The pair of 
eyes are rarely absent. ‘The second pair of antennez are 
not greatly longer than the first. The powerful mandibles 
have a three-jointed ‘ palp;’ the five-jointed maxillipeds 
form an operculum over the two delicate pairs of maxille. 
The first gnathopods are subchelate. The second are 
similar to the first in the male, except that they are 
smaller, but in the female they are similar to the following 
perzeopods. The last perezeopods are smaller than any 
os 
