BY S. J. JOHNSTON. 313 



The yolk-glands are extensively developed, and consist of oval 

 follicles, 0-058 x 0039 mm. Anteriorly, they do not extend 

 beyond the fork of the intestine, and, in front of the ovary, 

 are confined to the sides of the body, not spreading inwards 

 beyond the intestinal limbs. They are very usually unequally 

 developed on the two sides, in the majority of the specimens, 

 not extending forwards on the left side as far as the ventral 

 sucker, while they reach a point just in front of it on the 

 right side (Fig. 45). Behind the ovary, thej' gradually spread 

 inwards, lying close to the surface of the body till, in the 

 region of the testes, or in some cases, just behind these, they 

 form a thin but complete, more or less superficial layer sur- 

 rounding the body (Fig. 45). The rather thin-shelled eggs 

 are broadly elliptical in shape, yellow to light brown in colour, 

 comparatively few in number, and fairly large (0-037 x 0022 

 mm. u 



DOLICHOSACCUS ISCHYRU S*, sp.n. 



(Figures 7, 46, 48, 49, oO, oOa). 



Diaf/nnxis. — Small, elongated, fairly robust worms, about 

 3 mm. long, not much narrower at the rounded-off ends. 

 Integument thick, spinv ; suckers fairly close together ; ratio 

 of oral to ventral, 4:3. Excretory vesicle very wide and long. 

 Genital pore just behind the intestinal fork. Testes smaller 

 than the trvary, one close behind the other in the middle line, 

 at the middle of the posterior half of the body. Ovary large, 

 ronnded oi' oval, 7?/ the middle line, iiearer the i^entvfd sucker 

 than in D. trypherns. Copulatory organs and Laurer's canal 

 as in the genus. Vitelline glands of moderately large follicles, 

 closely jHicked together, extending anteriorly right wp to the 

 oral sucker, in front of the ovary laterally placed, but in the 

 posterior part of the body spreading under the whole surface. 



icryypo^, rohust. 



