APPENDIX. No. IV. 415 



Zoea clavata. The eyes of this species, like that of its congener, are large, 

 Mrith very short peduncles. The sheU 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. 



Obs. It differs from Bosc's Zoea pelagica in having clubbed instead of 

 acute spines. Its situation is certainly in the same group with Nehalia. 

 Two new genera of the same natural family with Squilla, 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 foDowing pairs 

 are short, with their last joint 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.f Mouth with two mandibles and four maxillae. Upper 

 antennae with three articulated set*. Under antennae with an elongate 

 lamella at tlieir base. Abdomen with two moveable fohaceous ap- 

 pendages arising from a common peduncle, attached to each side of the 

 belly : the peduncle of those of the iiist joint is produced into a spine; 

 tlie exterior lamella composed of two joints. The second pair of legs 

 of tlie following new genera, Smerdis and Alitna, have none of those 

 denticulations w-hich afford so striking a character in those of Squilla. 

 Gen. I. Smerdis. Sides of tlie shell apjiroximate beneath. Mouth anterior. 

 Sp. 1. Smerdis vulgaris. Shell with a very short spine on the hinder part of 

 its bac1< . 



This animal was found in great plenty every day from the latter end of 

 April to the beginning of June. 

 .S^. 2. Smerdis armata. Shell with a very long spine on the liinder part of its 

 back. A few specimens of this species were taken between the latter end of 



* Which is broken ia the only tolerable specimen that was sent home. 



+ All the legs of these genera, as well as of Sqiil'/a, 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 he 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. 



