abranchiate:. 145 
Immediately after the Nephelides come the Branchiobdella, 
Odier, remarkable for their two jaws and the absence of eyes. 
One species is known which lives on the branchiae of the 
Astaci * * * § . 
In all these subdivisions the anterior sucker is but slightly sepa- 
rated from the body; in the two following ones it is clearly distin- 
guished from it by a strangulation, is composed of a single segment, 
and has a transverse orifice. In the 
He;moc HARIS, 5au.f 
In addition to this conformation, there are eight eyes, a slender 
body, and but slightly distinct rings. The jaivs are salient, and 
scarcely visible points. The Hsemochares do not swim, but walk 
like the caterpillars called Geometrse, and adhere particularly to 
fishes. 
One species, Hirudo pisciiim, 1 j.; Roesel, III, xxxii, is fi’e- 
quently observed on the Cyprini The 
Albiona, Sav.^ 
Differs from the preceding subgenera in the body, which is studded 
with tubercles, and in having six eyes. The Albionae inhabit the 
Ocean. 
Alb. muricata ; Hirudo muricata, L. A very abundant spe- 
cies in the seas of Europe ; it is covered with small tubercles ||. 
There is a parasitic animal that lives on the Torpedo called Bran- 
CHELLiON*[|, which closcly I'esenibles a Iccch in its two cups, depressed 
body, and transverse plicae. Its anterior cup, which appears to have 
a very small mouth in the posterior margin, is placed on a narrowed 
portion resembling a neck, at the root of which is a small hole for the 
organs of generation ; there appears to be another behind. The 
lateral edges of its plicae, which are compiessed and salient, have 
been considered as branchiae, but I can find no vessels there ; its epi- 
dermis is ample, and the envelojie like a very loose sac**. We also 
commonly place among the Leeches the 
* Branchiobdella Astaci, Od., Mem. de la Soc. d’Hist. Nat. de Paris, t. I, pi. iv. 
t M. de Blainville, who had named them Piscicol.e, a name adopted by La- 
marck, has again changed it to Icthyobdell.v. 
4 Add, Piscicolu cephalota, Caren., pi. xii, f. 19, and Moq. Tand., pi. vii, f. 2; — 
Piscic. fesselata, Moq. Tand., f. 3. 
§ The PONTOBDELL.E, Leach and Blainv. 
II Add, Ponfobdella areolata ; — Pont, vcrrucata ; — Pont, spintdosa, Leach, Zool. 
Miscel., Ixiii, Ixiv, Ixv ; — Hirudo vittata, Chamiss., and Eisenhardt, Nov. Act. Nat. 
Cur.,t. X, pi. xxiv, f. 4. 
^ The PoLYDORA, Oken; Branchiobdellion, Rudolphi ; and the Branchiob- 
della, Blainv. 
** It is the Branchellion torpedinis, Sav., but it mustnot he associated with the 
.species found on the Tortoi.se {Hir brancliiala, Menzies, Lin. Trans., I, xviii, 3), 
which really appears to have branchiEe that re.semble a branch of feathers, and 
which it is requisite again to examine. 
VOL. Ill, 
L 
