682 DR. WILLIAM NICOLL ON 



divides just behind the ovary into two limbs, which pass forwai^ds 

 a short distance in front of the ventral sucker. They are thus 

 not so long as in the above mentioned species. The main stem, 

 too, appears more expanded. There is the same system of 

 secondary lateral branches which anastomose freely in the sides 

 of the body. 



The genital aperture is situated almost at the extreme left 

 margin of the body, on the level of the posterior end of the 

 pharynx. The genital sinus is very small. The cirrus-pouch is 

 very like that of Lechriorchis valichcs, but it is shorter. It is 

 usually disposed obliquely, and it terminates a short distance in 

 front of the ventral sucker, from which its end is usually separated 

 by a coil of the uterus. In one specimen it almost reached the 

 sucker. It contains a small convoluted vesicula seminalis, ending 

 in a narrow portion which runs into the pars prostatica. The 

 latter is not so long as in the foregoing species, and it is more 

 expanded, especially at its posterior end. The prostatic cells are 

 numerous. There is a short ductus ejaculatorius, and an unarmed 

 ciri-us of moderate length. The testes are situated just behind 

 the middle of the body (-3 mm. behind the ventral sucker). They 

 are symmetrical and lateral. They lie behind the ends of the 

 intestines, but are separated from them by folds of the uterus. 

 The length of each is about -5 mm. They are fairly thick and 

 elongated, and their outer margin is always distinctly divided 

 into three large lobes, which may in addition be slightly crenated. 

 The inner margins are completely obscured by the ovei-lying folds 

 of the uterus. 



The ovary is situated over the right posterior quadrant of the 

 ventral sucker and projects half beyond it. It is obliquely ovoid 

 and measures '24 x '17 mm. A large shell-gland lies close to its 

 inner side. The yolk-glands are entirely latei-al and of limited 

 extent. They reach from the anterior border of the ventral 

 sucker to about the middle of the testes. Again in this species, 

 however, the posterior limit is extremely variable, and may be 

 anywhei-e between the anterior and posterior bordei's of the testes, 

 but never beyond them. The anterior limit is practically con- 

 stant. The uterus fills almost the whole of the post-acetabular 

 region, but its configuration is entirelj^ diflerent from that in 

 Lechriorchis. Here, again, the descending limb is small and 

 almost empty ; reaching the posterior end of the body it turns 

 into the ascending limb. In this case, however, accommodation 

 for the enormous number of ova is obtained not by excessive 

 dilatation, but by numerous convolutions, the diameter of the 

 nterus not being very greatly increased. The convolutions have a 

 markedly transverse disposition, extending from side to side of 

 the body. In the region of the testes the convolutions are shorter 

 and stouter. An additional small convolution is formed in front 

 of the ventral sucker. The uterus terminates in a well-marked 

 vao-ina, which is about a third of the length of the cirrus-pouch. 

 The ova are very like those of Lechriorchis validus, but are usually 

 more oval. They have a large distinctly-marked operculum, and 



