280 Macteay MemoriaL Vouume. 
long as the head is wide. There are six (?) indistinct papillee inside the row of 
sete. The circular lateral organs are one-fourth as wide as the neck, and are placed 
at a distance from the anterior extremity equal to four times the depth of the simple 
somewhat cup-shaped pharynx. This latter is one-third as wide as the head and leads 
into a cylindroid cesophagus nearly two-thirds as wide as the neck and presenting a 
very slight expansion in front of the distinct and deep cardiac constriction. For some 
distance behind the pharynx the cesophagus is very transparent. The lining of the 
cesophagus when seen in optical section is more or less sinuous. At the beginning, that 
is opposite the cardia, the intestine is somewhat transparent, giving rise at first to the 
impression that some gland-like organ is present here, but careful examination serves 
to dispel the deception. The intestine is two-thirds as wide as the body and is 
composed of cells indistinctly to be seen on account of the multitude of granules with 
which they are filled. The transparent rectum is conoid, and its length is equal to 
that of the anal body-diameter. Nothing was learned concerning either the ventral 
excretory organs or the-lateral fields. The nerve-ring is situated near the middle of 
the neck. The tail is conoid to the terminus, where it is one-sixth as wide as at the 
base. The vulva is depressed. The eggs are twice as long as the body is wide and 
one-fourth as wide as long, and are probably deposited before segmentation begins. 
Illustrations on Pl. xxxviu. 
Hfab.—¥F ound in humus about the roots of banana plants, Fiji, July, 1891, where 
it appeared to be uncommon. It is found also in Western Europe and many parts of 
Australia. 
Genus TRIPYLA, Bastian. 
The comparatively simple and rudimentary Nematodes composing this genus 
- os FIC : 02 19° 53° g6- 
have the proportions indicated by the generic formule jg34-g2-3e—97 *m™m. and 
iscs- 33-35-37 2mm. The species are usually found in moist or muddy soil, though 
one is marine. The cuticle is in most cases finely striated and destitute of any 
conspicuous hairs except the cephalic sete, which apparently vary in number from 
six to ten and are invariably situated on the margin of the head, being in some cases 
so reduced in size as to resemble papille. The conoid neck ends in a head usually 
truncate and bearing three broad flat and inconspicuous lips armed with one or more 
inconspicuous papille. Nothing is known concerning the lateral organs ; they must 
if present be very inconspicuous. There are no eye-spots. A pharynx is altogether 
absent, the mouth opening being on the surface of the head. . The conoid to cylindroid 
cesophagus is sometimes slightly larger near the head; it is separated from the 
intestine, which is one-half to three-fourths as wide as the body, by a distinct 
constriction. The junction of the cesophagus with the intestine often forms a flat 
