366 ENTOZOA. 
nected with the body by ashort pedicle, and under its anterior mar- 
gin are two small ones, between which, and somewhat posteriorly, is 
the mouth. A circular ramified vessel, the nature of which it is dif- 
ficult to determine, is observable in the parenchyma of the body. 
T. coccineum, Cuy., a species more than an inch wide, and of a 
bright red colour, that attaches itself to the branchiz of various 
fishes of the Mediterranean, such as the Orthagoriscus, Xiphias, 
&c.(1) 
One of the most extraordinary genera of this family is the 
Hecrocoty.ie, 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. argonautze; Trichocephalus acetabularis, Delle Chiaie Mem., 
p: li, pl. 16, f. 1, 2. Smaller and with but seventy suckers. It 
lives on the Argonaut. 
Here perhaps should come the genus 
AsPIDOGASTER, Ber. 
Where the venter is furnished with a lamina excavated by four 
ranges of fossulz. 
Al. conchicola, Ber., Ac. Nat. Cur. XIII, p. li, pl. xxviii. - It 
is very small and lives on Muscles. 
(1) Lamartiniére found a similar but grey one on a Diodon near Nootka-Sound. 
It formed the genus Caspata, Bosc., Nouy. Bullet. des Sc., 1811, and that of Payz- 
u1nz, Oken, Zool., pl. x. See Journ. de Phys., Sept. 1787, pl. ii, f. 4, 5. We 
may unite to it the Tristoma elongatum, Nitzsch, or Nitscuta, Ber., Ac. Nat. Cur., 
XIU, pars I, tab. XX XU, f. 1—5. The Axrnz of the Belone, Abild., Soc. Nat. Hist. 
Copenh., Ill, p. 2, pl. vi, f. 3, appears to be a Tristoma, with an extremely elon- 
gated body, very large posterior suckers, and very small anterior ones. 
