S02 



FRESH-WATER BIOLOGY 



63 (62) Lateral organs or amphids more or less conspicuous spirals or circles. 



Anonchus Cobb. 



Genus of which a single species is known. There are indications of folds surrounding the 

 mouth opening, so that in all probability the lips may be opened outward as in Mononchus. 



Single species known Anonchus monhystera Cobb 1913. 



^'jl i7r^~iA 4 J — t.r^ ' '""■ Lateral fields occupied by about forty internal 



ellipsoidal bodies, rather equally spaced in two series, 

 ^o J^--J---^-5^ — 'l»~i=vrr* ' "*■ Cardia slender, as long as the neck is wide. The 



twenty tubular male supplementary organs are con- 

 tinued to the head by a series of about seventy minute ventral depressions. 

 Habitat: Mud about the roots of aquatic plants, Potomac River. 



Fig. 807. Anonchus monhystera. 



a, mouth opening; J, pharyox; c, cephalic seta; 

 d, lateral organ; e, esophagus; /, cellular body in 

 lateral field; g, nerve-ring- /), excretory pore; 

 •', cardia; 3, anterior end ofintestine; k, renette 

 cell; /.lumen of intestine; m, blind end 01 testicle; 

 «, testicle; 0, spermatozoa; p, one of the Duraerous 

 supplementary organs; q, anus; r, accessory piece; 

 St one of the caudal glands; t, terminus; w, right 

 fpiculum. (After Cobb.) 



Fig. 808. Anonchus monhystera. 



a, mouth opening; 6, cephalic seta; c, chitinous 

 element, anterior portion of pharynx; d, pharynx; 

 e, spiral amphid; /, radial musculature of esoph- 

 agus; g, lumen of esophagus; h, cuticula; t, 

 ampulla of gland (?); j, body wall. (After Cobb.) 



