AET. 12 A ^NE^y LIVER FLUKE FROM A MONKEY — SANDGROUND 9 



from its dilated funnel-shaped portion, three narrow teeth project 

 into the mouth capsule. Male bursa with lateral lobes and an incon- 

 spicuous dorsal lobe. Ray formula as in genus OesopJiagostomum. 

 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. — Colohostrongylus strongi, new species. 



COLOBOSTRONGYLUS STRONGI, new species 



Specific diagnosis. — Colohostrongylus: 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, measuring 0.12 mm. by 0.11 mm., and with a thick chitinous 

 wall. The dorsal gutter of the esophageal gland was not visible, and 

 is probably absent. There are two leaf crowns, the external com- 

 posed of 24 narrow elements, which project for a short distance 

 beyond the mouth aperture, and an internal leaf crown consisting of 

 exceedingly minute peglike elements, whose number can not be 

 accurately computed. The esophagus is clavate, the posterior swollen 

 portion being 230m wide. Its anterior quarter is bent at an angle 

 from the main axis of the esophagus, 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 debris obscuring the view. Excretory tubule very narrow, 

 opening at a level with the kink in the esophagus, 0.31 mm. from the 

 anterior extremity. Cervical papillae were not visible. 



Male. — From 24 mm. to 26 mm. in length with a maximum breadth 

 of 0.47 mm. near the middle. Bursa short, measuring 0.23 mm. long 

 by 0.4 mm. wide. Ray formula similar to that of the genus Oesopha- 

 gostomum; ventral rays cleft near their base and parallel. Externo- 

 lateral and other lateral rays arise from a common trunk; the former 

 diverges and its tip does not quite reach to the margin of the bursa* 



