Coss—Nematodes, mostly Austrahan and Fijian. 271 
: er 14° 50” 89° . 2 
9. D. fluviatilis, de Man. $44} 18mm. Cuticle very finely transversely 
striated ; neck conoid, diminishing much; cephalic sete two, lateral; lateral organs 
small clefts, alike in both sexes; pharynx with two large teeth of equal size, both 
edged and pointed and crossed when at rest, in the living state continually biting 
together; wall of the pharynx in front of the teeth longitudinally striated; portion 
of the cesophageal tube behind the stout median bulb two-thirds as long as the 
remainder; tail conical to the hair-fine terminus; oviparous. 7-7-7 13m. With 
the exception of two small pairs near the middle of the tail, all the male papille are 
bristle-shaped. The bristle-shaped papilla are arranged as follows: one pair sub- 
median just in front of the anus, one pair lateral just in front of the anus; one pair 
submedian a little behind the anus, one pair submedian near the middle of the tail, 
one lateral pair between the two pairs last mentioned, and, finally, one lateral pair 
far back. Spicula stout, plump, arcuate; accessory pieces long, rod-shaped. 
Hab.—Found in water, Holland ; less common than 2. vzvalis. 
10. D. trichuris, n.sp. 
tudinally by about forty wings and transversely by numerous striz. The convex- 
conoid head bears four very short and inconspicuous spreading submedian cephalic 
Basin 
ED 
ag pl rey 
oF 
331-13 13mm The cuticle is traversed longi- 

setze arranged opposite the apex of the conspl- 
; 3 0 a, labial papilla. 
cuous dorsal tooth. Six labial papillae surround bs cephalic Tae 
c, one of the ribs of the pharynx, 
d, lateral organ. 
e, median bulb. 
J, nerve-ring. 
g, exeretory pore. 
h, cardiac bulb. 
z, 1, dorsal tooth. 
Jj, salivary gland (?). 
k, pharynx. 
1, organ of nnknown function. 
m, reflexed blind end of testicle. 
n, proximal end of spiculum. 
0, 0, anterior group of male 
papille. 
p, preanal ventral papilla. 
4 % q, Median group of male 
papille., 
7, Supposed outlet of gland. 
s, posterior group of male pa- 
illee. 
t, hind end of testicle. 
u, ejaculatory duct, 
v, anus. 
w, anus, female. 
x, gland (?), 
y, outlet of same. 



the mouth-opening, which is longitudinally 
striated inside and supported by longitudinal 
ribs. The elongated-elliptical lateral organs, 
Son a8 
Eo 

one-eighth as wide as the head, are situated 
parallel to and opposite the middle of the 
pharynx. This latter is narrow, bemg only 
one-fourth as wide as deep, and contains a single 
large hamate dorsal tooth whose apex is nearly 
on a level with the lips. This tooth is so large 
fea 
So 
as to pretty well close up the mouth opening. 
All the organs in the neck are quite typical. 
The ellipsoidal median and cardiac bulbs are of 
nearly equal size: though the cardiac if any- 
thing is the larger, the median is manifestly ai ~~ z, terminus. 
the more perfectly developed; they are two- Fic. 3.—I, male Diplogaster trichuris ; II and 
: II], head and anal region of the same, more highly 
thirds to three-fourths as wide as the neck. magnified; IV, anal region of the female of the 
Same worm. 
The portion of the cesophagus between the 
pharynx and the median bulb is one-half as wide as the neck and about twice as 
wide as that part between the two bulbs. The intestine is two-thirds as wide as 

