CIRRHOHODA. 
119 
on the lower part of the abdomen. These cirri, however, may be 
considered as analogous to the articulated appendages of certain 
species of Teredo, while the ganglions in some respects are mere 
repetitions of the posteidor ganglion of the bivalves. The position 
of these animals in the shell is such, that the mouth is at the bottom 
and the cirri near the orifice. Between the last two cirri is a long 
fleshy tube, that has sometimes, but erroneously, been takon for their 
proboscis, and at the base of Avhich, near the back, is the opening of 
the anus. Internally, we observe a stomach inflated by a multitude 
of small cavities in its parietes, which appear to fulfil the functions 
of a liver, a simple intestine, a double ovary, and a double serpentine 
oviduct, whose walls produce the prolific fluid, and which, prolonged 
in the fleshy tube, open at its extremity. These animals are always 
fixed. Linnaeus comprised them all in one genus — Lepas, which 
Brugieres 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 gi-eatly 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 shortest. The branchiae 
are elongated pyramidal appendages, that adhere to the external base 
of the whole of the cirri, or of part of them. 
The two principal valves, of the most numerous species (Penta- 
LASMis, 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 one unites the posterior edge to that of the oppo- 
site valve; these five pieces cover the whole of the mantle. From 
the usual place of the ligament arises the fleshy pedicle; a strong 
transverse muscle unites the two first valves near their summit ; the 
mouth of the animal is concealed behind it, and the posterior extre- 
mity of its body, with all the little articulated feet, is a little beyond 
it, between the four first valves. 
The most common species of the European seas, Lepas ana- 
tifera, L., owes its specific appellation to the. fable which repre- 
sents it as producing the Bernacles and Macreuses, a story 
founded on the rude resemblance that lias been observed to exist 
between the pieces of this shell, and a bird. The Anatifae adhere 
to rocks, piles, keels of vessels, &c. f We may distinguish 
from them 
* This name of Lepas formerly belonged to the Palella, Linnaeus, supposing 
that some of these Cirrhopoda existed which had no shells, gave them the name of 
Triton : but the existence of these Tritons is not confirmed, and we are to conclude 
that Linnaeus merely saw the animal of an Anatifa torn from its shell. 
f Add Lepas anserifera, Chemn., YlII, c. 856; — Anaf. dentala, Brug., Encyc. 
Method., pi. 166, f. 6, or Pentalasmis falcaia, Leach, Edinb. Encyc. 
