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. 1 g) 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 setae. 
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-g. 
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 
colour is of a dull white, opaque ; the valves are smooth 
and tumid. 
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 
