VIII PRACTICAL DIRECTIONS 413 



1. The //««/ j/zx, much as in c 2, but laterally compressed. The en- 

 dostyle is now converted into a groove. 



2. The hepatic cwcum, on the right side of the pharynx, and covered 

 by the atrial epithelium. Note the calo/nic space around it, in which 

 are iht portal veins ^ and the hepatic veins (dorsal side). 



3. T\\^ gonads [ovaries or sperinaries) — large masses on either side o- 

 the pharynx, projecting into the atrial cavity and covered by the atrial 

 folds. The spaces around them represent j^ortions of the ccelome. 

 Note the small sperin-cells in the male, and in the female, the large ova. 



(The nephridia can only Ijc made out satisfactorily in good sections of 

 very well preserved specimens. ) 



