416 ENTOZOA, 
One of the most extraordinary genera of this family is the 
Hecrocotyte, Cuv. 
Long worms, thickest and compressed at the anterior extremity, in 
which is the mouth, whose inferior surface is completely covered 
with numerous suckers arranged in pairs, to the number of sixty or 
a hundred ; there is a sac on the posterior extremity with the folds of 
the oviduct. 
H. octopodis, Cuv., Ann. des Sc. Nat., XVIII, pl. xi. From 
four to five inches long, and with a hundred and four suckers or 
cups; it lives on the Octopus rugosus—Sepia rugosa, Bosc.— 
and penetrates into its flesh. The Mediterranean. 
H. argonaute; Trichocephalus acetabularis, Delle Chiaie 
Mem., p. ii, pl. 16, f. 1, 2. Smaller, and with but seventy 
suckers. It lives on the Argonaut. 
Here, perhaps, should come the genus 
AspipocasTer, Ber., 
Where the venter is furnished with a lamina, excavated by four 
ranges of fossulze. 
A. conchicola, Ber., Ac. Nat. Cur, XIII, p. ii, pl. xxviii. It 
is very small, and lives on Muscles. 
I cannot help thinking that we should also approximate to Fasciola 
most of the animals contained in the genus 
PranariaA, Mull.*, 
Although they do not inhabit other animals, but merely live in salt or 
fresh water. Their body is depressed, parenchymatous, and without 
a distinct abdominal cavity. The oral orifice, placed under the mid- 
dle of the body, vr more posteriorly, and dilated into a little proboscis, 
leads, as in Fasciola, to an intestine whose numerous ramifications 
are formed in the thickness of the body. A vascular network occu- 
pies the sides, and behind the alimentary orifice is a double system of 
genital organs. They also enjoy a reciprocal coitus. Small black 
points are observable, which probably are eyes. 
These animals are extremely voracious, and do not even spare 
their own species. They not only multiply in the ordinary manner, 
put are reproduced with great facility by division. They even ex- 
perience spontancous divisions. 
* At the period of my first edition, it was by conjecture only that I placed the 
genus Planaria here, having no sufficient anatomical data to give me an idea of its 
natural affinities. Since then® the observations of MM. R. Johnson, Phil. Trans., 
Dallyell, Monog., Ber., Ac. Nat. Cur., XIII, Dugés, Ann. des Se. Nat., XV, and 
those made by myself, appear to confirm this classification, which has been adopted 
by M. de Lamarck. 
