272 DREDGING REPORT, 1862. 
In general form this species is considerably attenuated ; the 
abdomen more especially being much produced. The carapace is 
short, and in length but little exceeds its breadth. The frontal 
and lower margins are well rounded, and not furnished with any 
spines or toothed processes. The five posterior thoracic segments 
are uncovered by the carapace. 
The superior antenne, which consist of a three jointed 
peduncle, and two two-jointed sparingly ciliated filaments, are . 
equal to about half the carapace in length. 
The first thoracic feet are very long and slender, projecting 
considerably in advance of the head; the second legs are also of 
considerable length. The fourth and fifth pairs of thoracic feet 
are not furnished with any secondary member or palp. The 
fifth or last thoracic feet (pl. XIII, fig.3), have the first jot very 
short, and not so long as broad. The second joint is four or 
five times as long as broad, with two small but strongly plumose 
cilia on the hinder margin, and three similar cilia on the front 
margin. The third joint is not so long as broad, furnished with 
two short strongly plumose cilia, and two whip-cilia in front of 
the fourth joint, which is twice as long as broad, has three 
whip-cilia on its front margin. The fifth joint,which is equal 
in length with the preceding one, has a single whip-cilium* in 
front, two plumose cilia behind, and two long whip-cilia attached 
to the postero-distal extremity. The sixth joint is much 
narrower than the fifth, and about half its length; its extremity 
gives rise to a long whip-cilium, and the seventh joint is in the 
form of a produced nail. 
There are no abdominal feet. 
The telson is well developed and of considerable size, being 
half as long again as the sixth abdominal segment, and equal 
in length to the peduncle of the lateral caudal appendages. It is 
furnished with two pair of long slender spines on its sides, and 
has the extremity beset with seven shorter and sub-equal spines. 
* T haye employed this term to designate a peculiar kind of cilium, which forms a charac- 
teristic feature in the garniture of the legs of the Diastylide. A “ Whip-Cilium ” is a 
long cilium, in which its basal portion is simple but the terminal half annulated or closely 
multarticulate (pl. XIV., fig. 4a.) These cilia are for the most part not plumose ; occasion- 
ally, however, the basal inarticulate portion is fringed with hair, and more rarely the cilium 
is plumose throughout its entire length 
