Cobb — Nematodes, mostly Australian and Fijian. 41 



average one-fourth as wide as the head, and is continued as a lumen half as wide in 

 the oesophagus proper. This latter is cylindroidal and a little more than half as wide 

 as the neck. A rather weak cardiac bulb appears to exist ; the cardiac coUum and 

 the bulb were less distinctly seen than would appear from the figures. The granular 

 intestine is two-thirds as wide as the body. I discovered nothing concerning the 

 ventral gland. The nerve-ring, which is placed far forward, makes but a slight angle 

 with the oesophagus. The slightly ventrally arcuate tail is conoid in the anterior 

 third, and thence is setaceous to the terminus, whose structure precludes its being 

 the outlet of caudal glands ; these latter, therefore, probably do not exist. The eggs 

 are apparently as long as the body is wide and two-thirds as wide as long. Male not 

 seen. Sketches of this worm occur on PI. ii. 



Hab. — Found in soil about banana plants, Fiji, July, 1891 ; not common. 



Genus DOKYLAIMUS, Bastian. 



i25 



1. D. exilis, n.sp. ^ ^^ ^i" '°2-4 Ts i'76°™- No cuticular markings were noted on 

 the two specimens examined. The neck retains the diameter of the body in the 

 greater part of its length, but becomes convex-conoid in the anterior fourth. The 

 truncate head bears six distinct lips, each of which is armed with the usual two 

 papillae ; the lip-region is expanded and conspicuous. The well-developed spear 

 slides in a close-fitting collar situated just behind the lip-region. The anterior part 

 of the oesophagus is one-third as wide as the corresponding part of the neck ; the 

 expansion takes place rather suddenly somewhat in front of the middle, and thence 

 to the intestine the oesophagus is nearly three-fourths as wide as the body, its central 

 canal being unusually conspicuous on account of the refractive nature of its thick 

 chitinous lining. The cardiac coUum is very distinct. The somewhat dark-coloured 

 intestine is three-fifths as wide as the body and is rather thick-walled. The narrow 

 rectum is nearly twice as long as the anal body -diameter. The pre-rectal portion of 

 the intestine is twice as long as the rectum. The tail is conoid, but diminishes more 

 rapidly in the anterior fourth than elsewhere. The eggs are two and one-half times 

 as long as the body is wide and about one-third as wide as long, i-* 2-2 2-4~2-7~ — 2^ i-6to2mm. 

 I have little doubt that this is the male of this species, although I did not find the 

 two sexes associated. The differences in structure are very slight, if any ; possibly 

 the pre-rectal portion of the intestine is a trifle longer in these males. The male tail 

 is blunt and rounded, hemispherical-conoid, and about four (possibly more) papillae 

 are found upon it near the end, to which nerves are plainly seen to pass. A ventral 

 row of about sixteen closely approximated innervated papillae begins at a distance in 

 front of the spicula equal to the length of the latter and extends forward to some- 



