CLASS THIRD. 
CIRRIPEDES. 
The animals are soft, destitute of a heac, and conse- 
quently eyes, covered with a shell, and are incapable of 
locomotion, being always affixed to extraneous bodies. The 
whole of the Cirripedes are multivalve, that is, consisting of 
more than two pieces, or valves. 
ORDER I.— PEDUNCULATA. 
Body supported on a tubular, membranaceous, moveable 
peduncle, the base of which is affixed to stones and other 
marine bodies, or timber floating in the ocean. 
Genus I. — POLLICIPES. — Leach. 
Generic Character. — Body covered by a shell, and sup- 
ported by a tubular, tendinous, squamiferous peduncle, 
which seldom exceeds two inches in length; shell multi- 
valve, compressed on the sides, with the valves nearly con- 
tiguous and unequal ; valves thirteen or more in number, 
those on the sides smallest; five upper valves much larger 
than the others, the anterior pair conical, elongated, with 
their sides reflected backwards, situate on each side of the 
opening ; the central, or terminal pair largest, and trapezi- 
form, wlth an acute angle at the posterior extremity ; dorsal 
valve greatly elongated, broad at the base, rounded in the 
back, with an acute apex ; between these, in the peduncle, 
are a number of smaller, testaceous, generally triangular, 
studs. 
Policipes sulcatus. Plate V. fig. 31; figs. 838 and 40, two 
of its valves. P. reflexus, two of its valves, figs. 37 and 39. 
The Policipes are marine shells; a very few species are known in a fossil 
condition; these have been met with in the Suffolk and in the Norfolk 
Chalk, also in the Gault and Greensand of England. 
