72 ASCAROIDEA 



Cobb, 1920, Contr. Sci. Nematol., ix, 307 and key ; Micoletzky, 

 1922, Arch.f. Naturg., Abt. A, Ixxxvii, 541. 



4. Onchium Cobb, 1920. 



Cuticle thin, very finely striated, without bristles. Head 

 not distinct, with four bristles. Lateral organs incipient 

 spirals, situated far forward. Stylet very short, hollow, not 

 knobbed behind. Oesophagus cylindroid, not distinct from 

 intestine (with posterior swelling, according to key). A pair 

 of ocelli present. Male unknown. Female genital tube 

 single, anterior, reflexed. Spinneret present. 



Hab. Marine (in sand). 



Genotype : 0. ocellatum Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol, ix, 303 and key. 



5. Onchulella Cobb, 1920. 



Cuticle extremely finely striated, without bristles. Head 

 not distinct, without lips or papillae, but with four bristles. 

 Lateral organs incipient spirals, situated far forward. Stylet 

 apparently solid, not knobbed behind. Oesophagus cylin- 

 droid anteriorly, " the posterior part more or less obscure." 

 A pair of ocelli present, with lenses. Oesophageal region 

 contains numerous elongate glands. Male unknown. Female 

 genital tubes paired, opposed, reflexed. Caudal glands 

 present. 



Hab. Marine. 



Genotype : O. ocellata Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol., ix, 306 and key. 



6. Triplonchium Cobb, 1920. 



Cuticle unstriated, without bristles. Head not distinct, 

 slightly conical, with six papillae. Lateral organs tubular, 

 protrusible. Stylet short, slender, knobbed behind. Oesoph- 

 agus cylindroid, with pyriform posterior bulb. Caudal 

 end of male apparently with one or two inconspicuous preanal 

 papillae. Spicules short and stout. " There are very 

 obscure, straight accessory pieces." (According to the 

 figures, the accessory pieces are a pair of peculiar ring-like 

 structures, with a diameter nearly equal to the length of the 

 spicules). Testis single, anterior, outstretched. Female with 

 single uterus, running posteriorly from the vulva, then turning 

 anteriorly. Ovaries paired, opposed, reflexed. Eggs few. 

 Tail in both sexes short and blunt. Spinneret absent. 



Hab. Soil. 



Genotype : T. cylindricum Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol, ix, 300 and key. 



