OF NEW ZEALAND. 107 
NEROCILA. 
Nerocila, Leach, Dict. Sci. Nat. xii, p. 351, (1818); M. Edw. Hist. 
Nat. Crust. iii, p. 250, (1840); Dana, U.S. Explor. Exped. xiv, Crust. 
part ui, p. 747, (1853). 
Elongate oval, moderately convex. Head very small, produced 
anteriorly beyond the bases of the antenne. Abdomen of moderate 
length, of equal width throughout. Segments of the body and the 
epimere produced backward into long acute spines. Femora narrow. 
Caudal appendages elongate, rami usually unequal. 
114. Nerocila imbricata. 
Cymothoa imbricata, Fabr. Ent. Syst. ii, p. 503, (1793). 
Cilonera Mac Leayii, (Leach. M.S.), White, Dieffenb. Voy. New 
Zealand ii, p. 268, (1843). 
Nerocila imbricata, List Crust. Brit. Mus. p. 108, (1847), sine deser. 
Rather narrow oval, moderately convex, smooth. Head flat, pro- 
duced forward, rounded in front, and terminating behind in a median 
rounded lobe, which is received into a corresponding excavation in the 
front margin of the first segment of the body. First three segments 
of the body with the lateral margins entire, the remainder with a 
transverse groove, produced for a short distance inward and forward, 
the sixth and seventh segments produced backward at the latero- 
posterior angle. Last segment of the tail with the margin rounded on 
the sides, extremity sub-acute. Caudal appendages with the rami 
unequal, the inner very obliquely truncate at the extremity, the outer 
longer, narrower, and acute at the extremity, Antenne small, hidden 
beneath the front. Epimere acute, produced backward, but not beyond 
the posterior margin of the segments of the body. Length 1} in. 
New Zealand (Coll. Brit. Mus.). 
Family I. GID. 
Cymothoadiens errans, M. Edw. Hist Nat. Crust. iii, p. 233, (1840). 
Aigide, Dana, U.S. Explor. Exped. xiv, Crust. part ii, p. 745, 
(1853). 
Body oval and convex. Head of moderate size. Abdomen longer 
than in the Cymothoide, 4-6 jointed. Antenne rising from the front 
margin, not from beneath the front of the head. Epimere conspicuous. 
Legs of the first three pairs terminating or not in a large curved claw, 
