42 Cobb — Nematodes, mostly Australian and Fijian. 



what behind the anterior end of the pre-rectal portion of the intestine. Oblique 

 copulatory lateral muscles occur, co-extensive with the pre-rectum. The elongated 

 acute spicula are bent at the middle ; their length is one and one-third times that of 

 the anal body-diameter. Figured on PI. v. 



Hab. — Somewhat rare about the roots of banana plants in Fiji, July, 1891. 



2. D. obtusus, n.sp. \. \. ^"7 %i^X\ i-62mm. The transparent cuticle of this rather 

 striking species is finely striated. The slightly convex-conoid neck terminates in a 

 somewhat truncate head with six inconspicuous lips each bearing two papillae in the 

 usual position. The anterior part of the oesophagus is one-third as wide as the 

 corresponding part of the neck and ends in a well developed spear; the posterior part, 

 beginning suddenly somewhat in front of the middle, is fully twice as wide as the 

 anterior part. The cardiac coUum is distinct but not deep. The intestine is about 

 two-thirds as wide as the body and the contents of its component cells are sometimes 

 so arranged as to give it an irregularly segmented appearance. The rectum is about 

 three-fourths as long as the anal body-diameter, while the pre-rectal portion of the 

 intestine is from three to four times as long as the rectum. The tail is short and 

 rounded, the cuticula being slightly thicker in the terminal part. Figured on PI. v. 



Hab. — Common about the roots of banana plants, in Fiji, July, 1891. Notwith- 

 standing careful search, no males were found. The females did not seem very active. 



3. D. longicollis, n.sp. -e 2-2 3-6 *3-6 — i- ^-aemm. No markings were observed on 

 the smooth and rather thick transparent cuticula. The neck is conoid and ends in a 

 rounded head composed of two parts of about equal length, of which the anterior 

 is much the narrower, and bears six quite rudimentary lips. Cephalic papillae if 

 present must be so inconspicuous as to have escaped careful search. The well 

 developed spear is about as long as the head is wide and about one-ninth as wide as 

 the head. The sinuous anterior third of the unusually long, oesophagus is one-fourth 

 as wide as the corresponding part of the neck ; at the end of the anterior third the 

 oesophagus becomes suddenly muscular and larger, that is to say, one-half as wide as 

 the neck, and continues thus to the end where it is separated from the intestine by a 

 distinct coUum. In young specimens the oesophagus occupies more than half of the 

 length of the body. The thin -walled intestine is two-thirds as wide as the body^ its 

 component cells being of such a size that about twelve side by side make up the 

 circumference, and having their granular contents so disposed as to give rise to a 

 rather distinct tessellation. The rectum equals the anal body-diameter in length. 

 In young worms the pre-rectal portion of the intestine was about twice as long as 

 the rectum ; presumably the ratio is no greater in the adults. The lateral fields are 



