APPENDIX. No. IV. ALS® 
Zoéa clavata. 'The eyes of this species, like that of its congener, are large, 
with very short peduncles. The shell is somewhat triangular; the front 
being terminated by a long spiniform rostrum.* The middle of the back 
and the sides are armed with a long clavate spine. 
Ons. It differs from Bose’s Zoéa pelagica in having clubbed instead of 
acute spines. Its situation is certainly in the same group with Nebalia. 
Two new genera of the same natural family with Sgwi/a, have esta-~ 
blished the situation of that genus. They have in common with it 
sixteen locomotive legs: the anterior pair is elongate and slender ; the 
second pair much elongated and raptorious ; the three following pairs 
are short, with their last jot compressed, and terminated by a move- 
able claw ; the three hinder pairs are short, and remote from the rest, 
the last joint but one being furnished with a moveable appendice at 
its base. Mouth with two mandibles and four maxilla. Upper 
antenne with three articulated setae. Under antenne with an elongate 
lamella at their base. Abdomen with two moveable foliaceous ap- 
pendages arising from a common peduncle, attached to each side of the 
belly : the peduncle of those of the last joint is produced into a spine; 
the exterior lamella composed of two joints. The second pair of legs 
of the following new genera, Smerdis and ~Alima, have none of those 
denticulations which afford so striking a character in those of Squilla. 
Gen. I. Smennts. Sides of the shell approximate beneath. Mouth anterior. 
Sp. 1. Smerdis vulgaris. Shell with a very short spine on the hinder part of 
its back. 
This animal was found m great plenty every day from the latter end of 
April to the beginning of June. 
Sp. 2. Smerdis armata. Shell with a very long spe on the hinder part of its 
back. A few specimens of this species were taken between the latter end of 
* Which is broken in the only tolerable specimen that was sent home. 
+ Allthe legs of these genera, as well as of Squilia, have each a foliaceous appendage 
at their base, which are certainly the organs of respiration. In Squilla, the outer 
foliaceous appendages beneath the abdomen, have filamentous processes, which the 
French naturalists have considered to be the respiratory organs. The two new genera - 
want these filaments, but have those appendages (common to all the malacostraca with 
pedunculated eyes) at the bases of their legs. 
