DINEMOURA. 
283 
been done. Dr. Johnston has described two species be- 
longing to this restricted genus, but under the name of 
Pandarus, both of which species were taken at Berwick- 
upon-Tweed. 
Anatomy . — The body of the animals belonging to this 
genus is of an oblong shape, resembling considerably that 
of the Caligidse, and divisible, as in them, into head, 
thorax, and abdomen. 
The cephalo-thorax, including the head and the first 
ring of the thorax, is in form of a shield or buckler, and 
somewhat of the same form and sculpture as in the 
Caligidse, being divided into several distinct portions, as 
in them, by deep furrows. The thorax is longer and 
narrower than the carapace. 
The articulations are very indistinct ; but M. Edwards 
enumerates five. The first is confounded with the head, 
and the second and third are small, and so united to- 
gether as to appear only one. It is of a quadrilateral 
form, and occupies the space left by the deep notch in the 
posterior part of the carapace. The fourth segment is 
about the size of the two preceding, but has attached to 
it two large moveable plates, which cover the whole arti- 
culation, and extend, like the elytra of insects, over part 
of the succeeding joint also. The fifth or last ring is the 
largest of all, and extends beyond the abdomen, nearly 
concealing it altogether. It terminates posteriorly in two 
rounded lobes, which have a deep notch between them, in 
which is seen the abdomen. This part of the body is 
small, of a square shape, and has appended to its ex- 
tremity two caudal appendages, slightly ciliated on the 
lower margin, and varying in size in the two sexes. In 
the female they are much smaller than in the male, and 
she has two long oviferous tubes, such as the Caligi pos- 
sess, much longer than the whole body of the animal, and 
arising near the posterior edge of the last segment of the 
thorax. The anterior portion of the carapace possesses, 
like the Caligidse, the small, narrow, transverse frontal 
