piscicolidjE. 39 



convex, obscurely annulate and smooth ; the ventral surface flat, 

 crossed with thirty-two raised equidistant plaits terminating by an 

 enlargement on each side in the lateral appendages. These are 

 foliaceous, with thin undulating broad lobes, veined with branching 

 vessels so that they have the appearance of being branchial. The 

 oral sucker is small, without eyes. The rings of the neck, which 

 tapers from its origin upwards, are obsolete, and there is a sexual 

 aperture at its base. The first segment of the body is rounded and 

 circular. Anal sucker twice as large as the oral, with a grauulous 

 disc. Length 2" ; breadth 4'". 



(a) English : with Soles, /. E. Grmj. 



Fam. II. PISCICOLID^. 



Sangsues albioniennes, Savigny, Syst. Annel. 106. 

 Hirudin EA albionea, Moq.-Tandon, Monogr. 280. 



Obs. The parasites of fish on whose juices they feed ; and, as the 

 mouth is edentulous, the fluid must be sucked through or from the 

 soft skin. The intestine has no sacculated appendages. The blood 

 is reddish or yellowish only. Some species communicate a strong 

 tincture to spirits. The ova are included in horny capsules, whicli 

 are attached to foreign bodies. 



2. PONTOBDELLA, Leach, 1814. 



Pontobdella, Leach in Supp. Encyclop. Brit. i. 451. Lam. Anini. s. 



Vert. V. 293. Blainville in Did. des Sc. nat. xlvii. 241, & Ivii. 



557. Moq.-Tandon, Monogr, 284. Diesing, Syst. Helm. i. 436. 

 Albione, Savigny, Syst. des Annel. 106, 110. 



Char. Body elongate-cylindrical, narrowed forwards, coriaceous, 

 distinctly and unequally annulated, with a complete circular sucker 

 at each extremity : oral sucker of one segment, separate from the 

 body, cupped, with an entire margin and an interior adnate cup, at 

 the base of which, a little to the ventral side, is the small mouth 

 furnished with three obsolete denticles : anal sucker cupped, terminal ; 

 the anus a minute pore on the back behind it : sexual pores anterior, 

 the male aperture posterior to the female. Parasites of sea fish. 

 The egg-capsules are erect, attached by a broad base ; and each 

 capsule contains a single foetus. 



* With a clitellus formed of eight unequal narrower rings, and where the 

 sexual pores open outwardly. 



1 . P. muricata, rings encircled with a series of subacute warts spi- 

 nulose on the top ; segment rings narrow, with small warts ; oral 

 sucker with three marginal tubercles on each side. Length 4". 



