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 PiSClcoLiE, adopted by M. de' 

 Lamarck, has again changed it into Ichthyobdella. 



We have one species of them, pretty frequently found in 

 the Cjprim.— Him do inscium, L. Rcesel, 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 are six in num- 

 ber. They live in the sea. They are the Pontobdella, 

 of Leach and Blainville. 



Our seas nourish in abundance the Alhiona verrucosa, 

 Hiriido muricata, L., all bristling with small tubercles. Add. 

 Pontohd. areolata, P. verrucata, P. spimilosa, Leach. Miscell. 

 Zool. Ixiii., Ixiv., Ixv. ; Hirudo vittata, Chamisson, and 

 Eisenhardt, Nov. Act. Nat. Car. t. x. pl. xxiv. f. 4. 



Branchellton. — 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, 



