NEMERTEA 



211 



Fig. 339 — Amphipo- 



rus ochraceus 



(Verrill). 



A. ochraceus Verrill (Fig-. 339). Body somewhat flattened, with a 

 somewhat broader head; yellowish in color; 7 cm. long and 3 mm. wide; 

 ej'es converging backwards: common between tide lines and beyond, 

 under stones, etc., in Long Island and Vineyard 

 Sounds; breeds in May and June. 



A. imparispinosus Griffin. Body small, 25 to 50 

 mm. long; slender, slightly flattened posteriorly; 

 white in color, sometimes with a reddish or yellowish 

 tinge; ocelli in two groups on each side, converging 

 anteriorly, less than forty in number: very common 

 between tide lines, among algae, etc., on entire 

 Pacific coast. 



A. angulatus (0. F. Miiller). Body stout with 

 convex back; reddish or brownish in color; 15 cm. 

 long and 8 mm. wide; head wider and set off from 

 body, white in front with white spot on each side 

 and an H-shaped figure in the middle; eyes nu- 

 merous: common under stones between tide lines 

 and beyond, from Cape Cod to Greenland; Puget Sound and north- 

 wards. 



2. Zygonemertes Montgomeiy. Body long and slender; head 

 broader than neck, with two pairs of lateral oblique 

 furrows; ocelli very numerous, extending back along 

 the sides of the body: 3 species. 



Z. virescens (Verrill) (Fig. 340). Body slender 

 and rather flat, usually light green in color, up to 4 

 cm. long and 1.5 mm. wide; eyes numerous, in two or 

 three parallel lateral rows along the side of the body : 

 common between tide lines and beyond in Long Island 

 and Vineyard Sounds; California. 



3. Proneurotes Montgomery. Like Amphiporus, 

 but with 5 midventral diverticula in the proboscis 

 sheath : 1 species. 



Zygonemertes P. multloculatus Mont. Body yellowish-brown in 



(Verrill). color with numerous eyes in two groups; 20 mm. long 



b', forward ^end! ^^d 3 mm. wide : New Jersey coast ; between tide lines. 



Family 4. TETRASTEMMIDAE. 



Body flat and slender or short and stout; 4 eyes usually present; 

 intestinal diverticula and gonads alternate regularly; cerebral organs in 

 front of the brain: 3 genera and about 75 species; in all seas, also in 

 fresh water. 



