294 
BRITISH ENT0M0ST11ACA. 
Edwards afterwards adopted the genus, in his 4 History 
of the Crustacea/ 
Anatomy , 8fc . — The body is of an ovoid shape, and of 
a light horny colour and substance. The cephalo-thorax, 
which includes the head and the first ring of the thorax, 
is somewhat swollen, and of a round figure in front, and 
cut square at its posterior margin. It is smooth on its 
dorsal surface, and does not appear divided into different 
regions, as in Cecrops. The second and third segments 
of the thorax are distinct, small, and narrow. The fourth 
is considerably larger, and has attached to its upper edge 
a large elytraform plate, which covers a great part of the 
last segment. This segment is much the largest of all, 
and in the female is dilated into the form of a broad and 
rounded elytraform plate, which covers the abdomen 
entirely. In the male it is not so large, and is simply 
two-lobed. 
The abdomen, in the female, is large, oval, and deeply 
notched posteriorly, and rounded at the sides into two 
lobes ; whilst in the male it is short and narrow. The 
caudal appendages are small, and of an oval shape, with 
four short, stout setae or spines, springing from their pos- 
terior edge. The antennae are small, composed of three 
short articulations ; the mouth-apparatus is of moderate 
size, and the structure of these parts and the foot-jaws 
is the same as in Cecrops. 
The males are much smaller than the females. The 
young, from the figure of Kroyer, appear to resemble a 
good deal the form of the Cyclopidae. The cephalo- 
thoracic portion is large, and quadrilateral in shape, and 
there are five distinct segments to be seen in the body, 
gradually diminishing in size as they descend, without 
any appearance of the elytraform appendages. It appears 
to have two large round eyes, situated in the front of the 
carapace. The antennae and the feet are more largely 
developed than in the adult. 
