34 
CLASS ANNELIDA. 
All these sub-divisions have the anterior sucker but little 
separated from the body ; in the following two it is clearly 
distinguished from it by a strangulation, is composed but of a 
single segment, and with a transverse aperture. 
HiEMOCHARls, Sav., have, with this conformation, eight 
eyes, the body narrow, and the rings but little distinct; their 
jaws are projecting points, scarcely visible. They do not 
swim, but walk like those caterpillars called geometrical, and 
particularly attach themselves to fish. M. de Blainville, who 
had given them the name of Piscicola;, adopted by M. de 
Lamarck, has again changed it into Ichthyobdella. 
We have one species of them, pretty frequently found in 
the Cyprini. — Hirudo piscium, L. Roesel, III. xxxii. Add. ; 
Piscicola cephalota , Caren. pi. xii. f. 19. ; and Moq. Tand. 
pi. vii. f. 2 , Piscic. tesselata, Moq. f. 3. 
AlbionA, Sav., differ from the preceding, because their 
body is bristled with tubercles, and their eyes arc six in num- 
ber. They live in the sea. They are the Pontobdella, 
of Peach and Blainville. 
Our seas nourish in abundance the Albiona verrucosa, 
Hirudo muricata , L., all bristling with small tubercles, Add. 
Pontobd . areolata, P. verrucata, P. spinulosa, Leach. Miscell. 
Zool. lxiiL, lxiv., lxv. ; Hirudo vittata , Chamisson, and 
Eisenhardt, Nov. Act. Nat. Car. t. x. pi. xxiv. f. 4. 
Branch ellion. — This name has been given to a parasite 
of the torpedo, very similar to a leech in its two cups or suckers, 
its depressed body, and its transverse folds. Its anterior cup, 
which appears to have a very small mouth at its posterior 
edge, is supported on a part attenuated in the form of a neck, 
at the root of which is a small hole, for the organs of genera- 
tion ; there appears to be another behind. They are the 
Polydorus ofOken, the Branchiobdellion ofRudolphi, 
and the. Branchiobdella of De Blainville. 
The lateral edges of its folds, compressed and projecting, 
