VIII PRACTICAL DIRECTIONS 413 



1 . The pharyiix, much as in c 2, but laterally compressed. The en- 

 dostyle is now converted into a groove. 



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

 by the atrial epithelium. Note the ccelomic space around it, in which 

 are the portal veins, and the hepatic veins (dorsal side). 



3. The gonads [ovaries or spermaries) — large masses on either side o. 

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

 folds. The spaces around them represent portions of the coelome. 

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



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

 very well preserved specimens.) 



