POLTCH^ETA 



301 



S. microphthalma Verrill. Body short, composed of about 60 seg- 

 ments; anterior region composed of 8 setigerous segments; gill filaments 

 with minute eye spots; color greenish-yellow; length 5 cm.; diameter 



3 mm. : North Carolina to Cape Cod ; at low- water mark, often incrusted 

 on oyster shells, etc. 



2. POTAMILLA Malmgren. About 12 to 30 gill filaments on each 

 side, some of which have eyes at the base; 



peristomial collar without a dorsal notch: 

 several species. 



P. oculifera (Leidy) (P. reniformis 

 Malm.). Length 8 cm.; color greenish or 

 reddish-brown: New Jersey to Bay of 

 Fundy; on shells in tide pools; Europe. 



3. MYXICOLA Koch. Body thick; hinder 

 region with numerous hooks in transverse 

 rows; gill filaments united by a mem- 

 branous web ; without eyes on head ; eye 

 spots on terminal segment; 2 small ten- 

 tacles: worms live in gelatinous masses 

 attached to shells, etc., in which each worm 

 has a separate tube; several species. 



M. steenstrupi (Kroyer). Body thick, 

 with about 60 segments, of which 8 belong 

 to the anterior body region; color pink; 

 length 6 cm.; width 5 mm.: north of Cape 

 Cod; Europe. 



4. MANAYUNKIA Leidy. About 36 gill 

 filaments with eyes at their bases; body 

 composed of but few segments: 1 species; 

 in fresh water. 



M. speciosa Leidy (Fig. 475). Body 



4 mm. long and consisting of 12 segments, 

 and yellowish-brown in color: in tubes on 



stones in Schuylkill River, Philadelphia, also in Egg Harbor River, New 

 Jersey, associated with Urnatella gracilis. 



5. FABRICIA Blainville. But few gill filaments or tentacles; body 

 composed of but few segments: few species, 1 in the Woods Hole 

 region. 



F. leidyi Verrill. Body 3 mm. long and .2 mm. wide, consisting 

 of 13 segments and yellowish-brown in color; 6 gill filaments: Long 

 Island Sound to Bay of Fundy; in slender tubes, at and below low- 

 water mark. 



Fig. 475 

 Manayunkld speciosa (Leidy). 



