318 



ANNELIDA 



2. Cystobranchus 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. GLOSSIPHONIIDAE. 



Fig. 499 



Fig. 500 



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 

 smooth surface; color variegated, being 

 greenish or yellowish, with longitudinal 

 rows of spots; lower surface 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; veiy 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 iu 

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



Fig. 409 — Branchellion raveneli 

 (Verrill). Fig. 500 — Glossiphonia 

 complanata — anterior end showing 

 eyes (Siissw. F. Deut.). 



