45 
The lumen of the right intestinal branch in which the ductus 
g. i. terminates is empty. Hence it was a little unexpected to find 
numerous egg-fragments in the left posterior intestinal branch. As 
j the more unaltered eggs agree very well with those in the uterus 
j both as to size, characteristic appearance, and staining ability 
i of the yolk granules etc., and, as they also lack shells, there can 
i 
i be no doubt but that they originate from the animal itself. It is 
r 
! obvious that they have reached the intestine via the ductus g. i., 
; then travelled forwards into the main gut, and from this gut into 
I the fellow-branch. I have not found any remnant of sperma in the 
^ intestinal system, but it is of course plausible, considering the 
; enormous production of sperma in this as in other Polyclads, that 
i 
j superfluous sperma, and particularly that which is not vigorous enough 
: to travel to the uteri, is pressed into the intestinal system of the 
i animal, with the aid of the peristaltic movements of the muscularis 
I of the ductus genito-intestinalis, in order to be assimilated in the 
] alimentary diverticula. The observations mentioned above give evi- 
i dence that also an absorption of superfluous egg-material takes place. 
i 
i Comparison with other Stylochid-genera. 
j Discosiylochus agrees in respect to the shape of the body with 
I that characteristic of Stylochidae, i. e. the short, wide, oval shape. 
■ Likewise the body is thick and firm. The genus differs from 
; StylochuSj Idioplana, Idioplanoides, and Meixneria in that the ten- 
tacles are decidedly rudimentary, while in this respect it shows a 
• similarity to Neostylochus and, though to a less degree, to Para- 
’■ stylochus and Cryptophallus. Limnostylochus is described as lacking 
j tentacles altogether, though tentacular eye groups have been 
; retained. Not even these are found in Bergendalia, which also 
lacks tentacles. The pharynx is not so well developed as is usu- 
j ally the case in Stylochidae. It is short, but quite wide through 
the presence of a few deep side-folds. The nearness of the genital 
pores to each other is a characteristic that is also common for 
Stylochus, Idioplana, Idioplanoides, Neostylochus, and Limnostylochus. 
\ The female genital aperture is relatively further away from the 
* posterior margin of the body than in other Stylochids, and in this 
I respect the genus probably most resembles Neostylochus. The 
i male organization is that typical for Stylochids. The prostate ve- 
