474 CLASS ECHINODERMATA. 
HECTOCOTYLES, Cuv. 
Long worms, more thick and compressed, at the anterior 
extremity where the mouth is situated, whose inferior face is 
altogether furnished with suckers, ranged in pairs, and of a 
very considerable number, sixty or an hundred, and which 
support at the posterior extremity a sac filled with the con- 
volutions of the oviduct. — 
The Mediterranean possesses a species four and five inches 
in length, with four hundred cuppers, which inhabits the 
octopus, and penetrates into its flesh. (Hectocotyle octopodis, 
Cuv., An. Sc. Nat. xviii. pl. x1.) 
And another smaller, with seventy cuppers, which lives on 
the argonauta. (H. argonaute, or trichocephalus acetabu- 
laris, Delle Chiaie. mem. part ii. pl. xvi. f. 1, 2.) 
Perhaps it is here that should come 
ASPIDOGASTER, Ber., 
Which has under the belly a lamina, hollowed with four 
ranges of small fossettes. 
There is a very small one which is a parasite of the mussels. 
(Asp. conchicola, Beer. An. Nat. Cur. xiii. part ii. pl. xxviii.) 
I cannot avoid thinking that we should still approximate 
to Fasciola the greater part of those animals comprehended 
under the genus 
PLANARIA, Mill. 
Although they do not inhabit other animals, but merely the 
fresh and salt waters. In fact, their body is depressed, 
parenchymatous, without any distinct abdominal cavity ; the 
alimentary orifice, placed under the middle of the body, or 
more behind, and dilating into a small proboscis, conducts, 
as in fasciola, into an intestine, whose numerous ramifications 
a 
