728 ON SOME TRKMATODE PARASITES, 



vessels. Gonads oval, comparalivelu large, in the posterior end of 

 the body, the anterior testis with its long axis transversely, pos- 

 terior with its long axis longitudinally disposed; ovary lying be- 

 tween the two testes, with its long axis transversely placed. Geni- 

 tal pore near the anterior edge of the anterior testis. Copulatory 

 organs well developed, but cirrus-sac moderate, and not surround- 

 ing the vesicula seminalis. Laurer's canal present, but no recep- 

 taculum seminis. Uterus in ascending and descending coils, not 

 reaching anteriorly beyond the ventral sucker, nor posteriorly 

 beyond the front of the anterior testis. Yolk-glands lying at the 

 sides of the body, between the ventral sucker and the anterior 

 testis; just reaching inwards beyond the intestinal limbs. 



Eggs dark-shelled, oval, flattened on one side, small, 00254 

 X 0-0165 mm. 



Tyije-specimen in the Australian Museum, No. W. 352. 



I received eight specimens of this worm, all obtained from one 

 host, from the Bureau of Microbiology, Sydney; of these, two 

 were sectioned, and the others mounted whole. The host, which 

 was sent in to the Bureau by Mr. Thomas Steel, came from Hun- 

 ter's Hill, a suburb of Sydney. These moderately small worms, 

 (j-33 mm. in average length, and 1-24 mm. in breadth, have a some- 

 what flattened, elliptical cross-section, remain fairly broad, and 

 are rounded oft' in front; but, behind the gonads, taper to a jioint 

 posteriorly. The cuticle is fairly thick, and the ventral surface 

 and the sides are thickly beset with small pointed spines, which 

 gradually become finer posteriorly, but are present right up to the 

 posterior end. On the dorsal surface, however, they practically 

 vanish at the level of the posterior edge of the ventral sucker. Both 

 the suckers are large. The oral sucker is subterminal, with its 

 opening directed ventrally; the average diameter is 0-67 mm. Tiie 

 ventral sucker, lying in tlie first body-third, is almost as broad as 

 the worm's body, its average diameter being 1001 mm., so that 

 the ratio of the diameter of the oral sucker to that of the ventral, 

 is 2 :3. The pharynx, which is preceded by a short praspharynx, 

 is a large muscular organ, practically circular in ventral 

 view, and having a diameter just one-half that of the oral 



