258 Mr. W. Nicoll on the 



sucker, as in T. Uaqna, is small and is situated ^dtliin the 

 anterior part of the genital sucker. The latter has a trans- 

 verse diameter of '055 mm. It is placed about the middle 

 of the body, slightly nearer the posterior end. The pharynx 

 has an ahnost constant size of '038 x '018 mm.; the pre- 

 pharynx is somewhat shorter. The oesophagus varies from 

 "06 mm. in a contracted specimen to "1^ mm. in an extended 

 one. The average may be taken as '10 mm., or nearly ^V of 

 the body-length. It is therefore longer than in T. lingua. 

 The intestinal diverticula are much the same as in the latter. 

 The excretory system is also similar. The cuticle is entirely 

 covered with scales, with the exception of a small part at tiie 

 posterior extremity. 



The testes have the same situation as in Tocotrema linr/ua. 

 They are irregularly oval, with indentations on their posterior 

 border, and they are so placed that their long axes are 

 almost at right angles to each other. The yolk-glands have 

 also a similar position, but they are not so extensive. As 

 far forward as the genital sucker their situation is purely 

 lateral, but at this level they bend in on each side and form 

 a complete arch in front of the ventral sucker. The anterior 

 lateral pruhmgations found in T. linf/va are not present hei-e. 

 The ovary is a small, roughly oval, lobed body, lying a short 

 distance in front of the testes on the right side of the middle 

 line. A receptaculum seminis is present in the middle 

 line between the ovary and testes. It is of variable size, 

 being sometimes smaller and sometimes much larger than 

 the ovary. The uterus lies between the testes and the 

 genital sucker and laterally does not extend much l)eyond 

 the intestinal diverticula. It has the appearance which is 

 characteristic of Tocotrema lingua, owing to its being- 

 arranged in three fairly regular transverse convolutions. 

 The ova are numerous and of a light brown colour. They 

 have a distinctive shape, pointed at one end, much broader 

 at the other. They ditler in this respect from those of 

 T. lingua, which are more nearly elliptical. I'lie most im- 

 portant feature distinguishing the two species is the size of 

 the ova. Jiigcrskiold gives the size in T. lingua as "048 x 

 •022 mm., which I am able to confirm ; in T. jejunum the 

 size is only "OSl-OSCx '016-'019 mm., the average being 

 •033 X -017 mm. 



In this species the vesicula seminalis is even more volu- 

 minous than in T. lingua. It extends back as far as the 

 anterior testis and is highly convoluted. At its anterior end 

 it becomes distinctly constricted and passes into the pars 

 prostatica. This is a large pear-shaped body, enclosed by a 



