444 cobb: new nematode genera 



Oesophagus half as wide as the neck. Cardiac bulb three-fourths as wide 

 as the neck, joined to the intestine by a slender ampulla as long as the neck 

 is wide. Eggs elongated, one at a time in the uterus. Spinneret with about 

 four finger-shaped, rather backward pointing setae, each not much longer than 

 the width of one of the adjacent annules. Spicula slender, tapering, actite, barely 

 cephalated, one and one-half times as long as the anal body diameter. Supple- 

 mentary organs nine, oblique, tubular, arcuate, protrudable, half to four-fifths 

 as long as the body is wide, occupying a distance twice as great as the length of 

 the tail, smaller and more amply spaced anteriorly, hindermost opposite the 

 proximal ends of the spicula. Hot sublimate to balsam. 



* Habitat; distribution. Potomac River, near Washington, D. C. Douglas 

 Lake, Mich. 



25. Anonchus monohystera, n.g., n.sp. 



Striae about 500. About forty inter- 



j'__^i..4 8.2/„.l7r '5Q...,.85.. ., 1. n,ni. nal ellipsoidal bodies in each lat- 



^' ' ' * ' eral field, spaced, in two series. 



[=a|-^ ■ I'^^^^ils '2.9 ^i-9^^" """* No cephalic papillae. Amphid one- 

 • ' fifth as wide as head. Pharynx half 



as wide as head; about as deep as wide. Oesophagus nearly half as wide as the 

 neck, joined to the intestine by a narrow cardia as long as the neck is wide. 

 Twenty tubular supplementary organs, each one-third as long as the body is 

 wide, extending from the anus to the middle of the body, and continued to the 

 head by a series of about seventy minute depressions. Four to five well devel- 

 oped ventral, sublateral setae on the tail, one in front of the anus. Spicula 

 slender, twice as long as the anal body diameter; proximal ends slightly cephal- 

 ated by expansion, accompanied by accessory piece near the anus and extending 

 inward and slightly backward. Hot sublimate to balsam. 



Habitat; distribution. Potomac River, near Washington, D. C. Douglas 

 Lake, Mich. 



26. Trischistoma pellucida, n.g., n.sp. 



^.e 9.1 22. '80^^ 92. . A mm. Cuticle naked, plain. Head continu- 

 l'^'^2.. 2.5 2.6 2.6 2.1 ^^g Pharynx Unarmed. Oesopha- 



gus two-thirds as wide as neck. Cardia rather cylindrical, two-thirds as long 

 as the diameter of the neck. Tail terminus one-sixth as wide as the base of 

 the tail; apiculate by what appears to be a very minute spinneret. Flemming 

 to glycerine. 



Habitat; distribution. Roots of sugar cane, Jamaica, West Indies. Re- 

 sembles Trilobus Bastian. There is an European species. 



Errata. On p. 434 Trichodora should read Trichodorus. 

 " " 435 T. obtura should read T. obturus. 



