290 Macieay Memoriat Vouume. 
average one-fourth as wide as the head, and is continued as a lumen half as wide in 
the cesophagus 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 collum 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 esophagus. 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 Pl. xxxvi.. 
FZab.—F ound in soil about banana plants, Fiji, July, 1891; not common. 
Genus DORYLAIMUS, Bastian. 
p20 
“7: 3. 6:3 26°9 ‘55° 91°4 s s 
1. D. exilis, n.sp. =—-g-—g3—3a-—13 176mm. 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 
papillz ; 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 cesophagus 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 cesophagus 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 collum 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. le ee) 16to2mm. 
T 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) papillee 
are found upon it near the end, to which nerves are plainly seen to pass. A ventral 
row of about sixteen closely approximated innervated papillee begins at a distance in 
front of the spicula equal to the length of the latter and extends forward to some- 
