CYPRIDINA. 181 



sharp setae near their extremities. They are inserted 

 into the body near the lower third, are first curved 

 upwards and backwards, and then twisted round and 

 downwards; they are always inclosed within the shell, 

 and appear to supply the place of the second pair of feet 

 of the Cyprides, and no doubt answer the same purpose 

 as these do in them. 



The abdomen (t. XXII, f. ly) is terminated by a broad, 

 caudal plate, which is large, flattish, and armed with nine 

 strong hooks and spines ; the six external of which are 

 powerful-looking talons, and are serrated on their under 

 edge. The first is much the longest and strongest, and 

 they gradually become shorter as they descend, the last 

 three being much smaller than the others, not serrated 

 on their edges, but terminated by a tuft of short seta?. 



It is rather remarkable that none of the long filaments 

 or setae, with which the different organs are furnished, 

 are plumose in this species. 



Hab. — Dredged in seventy fathoms, between the islands 

 of Lewis and Skye, R. M' Andrew, Esq. 



2. Cypridina Brenda. Tab. XXIII, fig. 1 a-^. 



The shell or covering is oval, rounded at both extremi- 

 ties, rather narrower at the anterior, where it is deeply 

 notched in front, producing a kind of short beak. The 

 colom' is of a dull white, opaque ; the valves are smooth 

 and tinnid. 



The eye (t. XXIII, f. 1 a) is large and ovoid, with about 

 twenty areolae. 



The first pair of antennae (t. XXIII, f. 1 e) is divided 

 into five articulations ; the first being the largest, and 

 the others gradually becoming shorter as they descend, 

 the last sending off four long, plumose filaments. The 

 second pair (t. XXIII, f. 1 c) is curved, and formed of five 

 joints : the basilar being stout and rather short ; the second, 

 longer, arched on one side, and provided with three or 



