1 1 
°f East Looe, to whom our museum is indebted for much 
valuable assistance, presented to me the feather already re- 
ferred to when speaking of ihe last species: — on which, 
along the stem of the vane, were several specimens of this 
species, standing in clumps, and of abont their full growth. 
B is clear that they must have seized on this feather, as well 
as on the piece of cork when floating on the surface ; and 
that in their first existence they are singly dotted over the 
surface. Their clustering afterwards is in the way of pul- 
sation; and though closely set in Ihe bottom, their 
subsequent growth, is in every imaginable angle of direction. 
POLLICIPES. 
GENERIC CHARACTER: The shell compressed at the 
sides, many valved, the plates rather contiguous, unequal; 
in number 13, or more; the lower side valves smallest. 
*P. SCALPELLUM. Lepas S. Turt. Lin. Mont. Test. 
Brit., vol. I, p. 18, pi. 1, fig. 3. Stew. Elem., vol. 2, 
P. 365. 
This species has been described as scarce ; but I have 
*°Und it common, if not abundant. It is found on the branches 
°f Gorgonia Verrucosa, and Dynamena Filicula, two species 
°f Corals ; and somewhat less frequently, hut of greater size, 
?u the stone to which they are attached ; but in every case, 
^ stands erect, and singly, without clustering. 
CLASS III. 
CONCIIIFERA. 
The shell always bivalve, wholly or partly covering the 
a QirnaI ; sometimes free, sometimes fixed ; the valves mostly 
I°>ned at the margin by a hinge or ligament. The shell is 
| 0 uietimes enlarged by testaceous or accessary pieces, not 
Gonging to the valves. 
This class is divided into two orders : Conchilcra bimus- 
Cu ‘°sa, and C. Unimusculosa. 
ORDER I. 
lat 
CONCHIFERA BIMUSCULOSA: 
S° named from having, in the interior, two separate and 
ter al muscular impressions. It is divided into lour sec- 
^°ns ; (j. Crassipeda ; C. Tenuipeda ; G. Lamellipeda ; and 
■ A-tiibigua, or the Chamacea. 
