20 Cobb — Nematodes, mostly Australian and Fijian. 



contain but one at a time. I do not know whether segmentation begins before the 

 eggs are deposited. Male unknown. Figures of this species are given on PI. iv. 

 along with those of D. parvus. 



Hab. — On decaying outside sheaths of young banana plants, Fiji, July, 1891. 



5. D. fllicaudatus, Biitschli. %% \ ^f '3°' ^f imm. Neck conoid ; cephalic setae 

 apparently four ; pharynx nearly as deep as the head is wide, and more than one-half 

 as wide as the head ; dorsal tooth projecting and thumb-shaped, reaching nearly to 

 the middle of the pharynx ; near the bottom of the pharynx two small submedian 

 teeth. The uterus appears never to contain more than one e^g at a time. 



Hab. — Cow-dung, Germany. 



6. D. australis, n.sp. \^ ^27 "'^ '%z '2- '^^ ■"'°- I cannot state positively whether 

 this female is not the mate of that described later on under the name D. graminum. 

 They were found together and have the same proportions, but there are marked 

 differences in the structure of the pharynx in the two specimens. In the present 

 species the cuticle is finely transversely striated. The pharynx is twice as deep as 

 wide, being simply deeply cyathiform in shape, and two-fifths as wide as the head. 

 The dorsal tooth is simple in character and extends half-way to the lips. Just behind 

 the pharynx the CESophagus is somewhat swollen, its greatest width in this part being 

 considerably less than that of the ellipsoidal median bulb, which is four-fifths as wide as 

 the middle of the neck. The posterior bulb is longer and narrower than the median. 

 Between the pharyngeal and the median bulbs the oesophagus is two-fifths as wide as 

 the neck, but between the median and cardiac bulbs it is only one-third as wide as the 

 neck. The intestine is very narrow at first, — only one-fourth as wide as the body, — 

 but soon becomes three-fourths as wide as the body. The narrow rectum considerably 

 exceeds the anal body-diameter in length. The reflexed ovaries reach nearly back to 

 the vulva and contain numerous ova arranged in several rows. The eggs are twice 

 as long as the body is wide and one-third as wide as long. The tail is conoid, being 

 setaceous in the posterior half 



Hab. — Grass, Sydney, New South Wales, Australia. 



7. D. minima, n.sp. \. "^ \^ %^ — %i -inun. The cuticle is traversed longitudinally 

 by about fourteen equidistant striae or wings, so arranged that one of them does not 

 fall on a lateral line, resolvable into dots •*l]i apart, thus indicating -the presence also 

 of about six hundred transverse striae. Neither setae nor lateral organs were seen. 

 The triquetrous pharynx is about one-fifth as wide as the head ; the dorsal tooth 

 is elongated and projects but slightly, although its apex approaches to near the 

 lips. The ellipsoidal median bulb is two-thirds as wide as the neck, the cardiac 

 bulb being, as usual, somewhat smaller and weaker. The transparent thick-walled 



