318 ANNELIDA 



2. CYSTOBRANCHTJS Diesing. Gills present in form of paired papil- 

 liform vesicles along the sides of the body; body composed of 2 regions, 

 a narrow anterior region of 11 somites and a broad posterior region; 

 each segment contains 7 rings: 2 species. 



C. vividus Verrill. Body with 11 pairs of vesicles, brownish or 

 purplish in color with 3 irregular rows of white spots on the back; 

 length 25 mm.; eyes 4: on Fundulus pisculentus; Long Island Sound; 

 also in fresh water. 



3. BRANCHELLION Savigny. Gills present in form of paired 

 aborescent appendages; body with a slender anterior neck: several 

 species. 



B. raveneli (Girard) (Fig. 499). Body with about 30 pairs of 

 gills, dark brown or purple in color; length 6 cm.: on skates and 

 rays. 



FAMILY 2. GLOSSIPHONTIDAE. 



Fresh-water leeches in which the anterior sucker is fused with the 

 body and the posterior sucker is distinct; each segment contains 3 

 rings; no cocoon is formed, the eggs and young being fixed 

 to the mother's body: several genera. 



1. GLOSSIPHONIA Johnson (Clepsine Savigny). Body 

 wide, attenuated forward, often brightly 

 colored; animal cannot swim but rolls 

 up when alarmed: numerous species; in 

 fresh water. 



G. parasitica (Say) (Clepsine plana 



Whitman). Body broad and flat, with a 

 Fig. 499 Fig. 500 ,, 



smooth suriace; color vanegated, being 

 Fig. 499 Branchellion raveneli . , ,, . , 



(Verrill). Fig. 500 oiossiphonia greenish or yellowish, with longitudinal 

 complanata anterior end showing /> , 



eyes (Suss w. F. Deut.). rows oi spots; lower suriace longitudi- 



nally striped; 2 eyes; length 6 cm.; 



width 2.6 cm.: the most abundant American species; on turtles or 

 under stones. 



G. complanata (L.) (Fig. 500). Body 30 mm. long and 10 mm. 

 wide, very flat; color greenish, spotted with yellow; eyes 6, in 3 pairs: 

 often common under stones in running water; very active; Europe. 



G. fusca Castle (G. lineata Verrill). Body 12 mm. long, flat and 

 broad, with 12 longitudinal brown stripes; 2 large eyes: in cold 

 streams. 



G. elegans (Verr.) (Fig. 501). Body elliptical, 18 mm. long and 

 7 mm. wide, brownish in color; head colorless; 6 eyes: abundant iw 

 shallow waters, often with G, stagnates; sluggish in its movements. 



