CLASS CIRRHOPODA. 135 
mals are always fixed. Linneus comprised them all in one 
genus, LEPAS, which Bruguieres divided into two, that have 
in their turn been subdivided. 
ANATIFA, Brug. 
A compressed mantle, open on one side, and suspended to a 
fleshy tube, varying greatly as to the number of testaceous 
pieces with which it is furnished ; twelve pair of cirri, six on 
each side, those nearest to the mouth being the thickest and 
the shortest; the gills are elongated pyramidal appendages, 
that adhere to the external base of the whole of the cirri, or 
part of them. 
The two principal valves of the most numerous species 
(PENTALASMIS, Leach), resemble those of a mytilus; two 
others seem to complete a part of the edge of the mytilus 
opposite to the summit, and a fifth azygous unites the posterior 
edge to that of the opposite valve. These five pieces cover 
the whole of the mantle. From the usual place of the liga- 
ment arises the fleshy pedicle; a strong transverse muscle 
unites the first two valves near their summit; the mouth of 
the animal is concealed behind it, and the posterior extremity 
of its body, with all the little articulated feet, is a little be- 
yond it, between the first four valves. 
The most common species of the European seas, Lepas 
anatifera, L., owes its specific appellation to the fable which 
represents it, as producing the Barnacles, a story founded 
on the rude resemblance that has been observed to exist 
between the pieces of this shell and a bird. The anatife 
adhere to rocks, piles, keels of vessels, &c.. We may distin- 
guish from them, 
POLLIcIPEs, Leach, 
Where, besides the five principal valves, there are several 
small ones near the pedicle (Lepas pollicipes, L., &c.), some of 
