90 ANNELIDA. 



Phylline (Oken). Body soft, sub-oval, flat, a 

 great terminal disk behind, armed with hooks. 

 Parasitical on the Holibut. 



P. hippoglossi. Fig. 136 ; n. s. 



Piscicola (De Blainv.). Body cylindrical, length- 

 ened, attenuated in front, with a sucker at each 

 end ; mouth toothless ; eyes four. 



P. marina (On the Pogge). Fig. 137 ; n. s. 



Pontobdella (Leach). Body cylindrical, length- 

 ened, covered with conical warts; distinctly ringed; 

 a sucker at each end ; mouth toothless. 



P. muricata. Fig. 138; ?i. s. P. laevis. 



Nephelis (Sav.). Body lengthened, depressed, 

 slightly tapering in front, obtuse behind; front 

 sucker small ; hind sucker obliquely terminal ; 

 mouth comparatively very large, without jaws; 

 eight eyes. 



N. octoculata. Fig. 139 ; n. s., and head mag. 



Glossiphonia (Johnst.). Body ovate, depressed, 

 slightly convex above, very flat beneath ; tapering 

 to a point in front ; rounded behind ; front sucker 

 small, hind sucker small or moderate, placed ex- 

 actly beneath : mouth large, without teeth, with a 

 tubular proboscis; eyes from 2 to 8, placed in 

 lines. 



G. Eachana. Fig. 140 ; n. s. 



Monopus (Gosse). Body sub-cylindrical, depres- 

 sed : fore sucker imperfect ; hind sucker columnar, 

 truncate, one-third of the total length from the tail : 

 eyes eight. 



M. medusicola (On a Medusa). Fig. 141 ; mag. *£. 



