NOTES AND DESCRIPTIONS OF SOME PARASITIC HELMINTHS 469 
NEMATODA 
Family STRONGYLIDAE 
COLOBOSTRONGYLUS, new genus 
Generic diagnosis. Strongylidae: Comparatively large worms with mouth 
directed straight forward. Buceal capsule infundibular and with thick walls. 
An external leaf crown with numerous slender elements and an internal leaf 
crown of minute elements present. Only the amphids, or so-called lateral papil- 
lae, are prominent in the cireumoral region. Cervical papillae very minute or 
absent. Anterior portion of oesophagus bent away from the main axis of the 
oesophagus; from its dilated funnel-shaped portion, three narrow teeth project 
into the mouth capsule. Male bursa with lateral lobes and an inconspicuous 
dorsal lobe. Ray formula as in genus Oesophagostomum. Spicules long and 
narrow, with knobbed proximal ends and without a sheath. Gubernaculum 
present. Tail of female mucronate. Anus and vulva open close together near 
tail. Vagina long, opening into two kidney-shaped chambers (pars ejaculatrix) 
which communicate with long ovejectors and parallel uteri. 
Type species. Colobostrongylus strongi, new species. 
COLOBOSTRONGYLUS STRONGI, new species 
Specific diagnosis. Colobostrongylus: In the preserved state the worms are 
girdled either at their anterior or posterior extremities with a belt of brownish- 
black material resembling clotted blood. They are yellowish in color and robust 
in build. Body cylindrical, tapering toward the anterior extremity. The cuticle 
is finely striated, and, as a marking superimposed on the general striation, the 
cuticle is coarsely crinkled in the anterior and posterior regions of the body. 
Head region well defined. There are four circumoral papillae and two amphids, 
or so-called lateral papillae. The submedian, dorsal, and ventral papillae are 
flat, and visible only when the head is cut off and viewed on end. The amphids 
are fairly conspicuous, and with a broad base, provided with a terminal sensory 
filament. Mouth directed straight forward, with comparatively narrow mouth 
collar. Diameter of mouth, 0.085 mm. Mouth capsule broader than long, measur- 
ing 0.12 mm. by 0.11 mm., and with a thick chitinous wall. The dorsal gutter of 
the oesophageal gland was not visible, and is probably absent. There are two 
leaf crowns, the external composed of twenty-four narrow elements, which project 
for a short distance beyond the mouth aperture, and an internal leaf crown con- 
sisting of exceedingly minute peg-like elements, whose number cannot be accu- 
rately computed. The oesophagus is clavate, the posterior swollen portion being 
230u wide. Its anterior quarter is bent at an angle from the main axis of the 
oesophagus, and anteriorly it is widened out to form a funnel from the base of which 
there projects, halfway into the buccal cavity, a chitinous trident composed of 
three narrow lancets. In some specimens the trident is rather difficult to see on 
account of débris obscuring the view. Excretory tubule very narrow, opening 
at a level with the kink in the oesophagus, 0.31 mm. from the anterior extremity. 
Cervical papillae were not visible. 
