90 



Mr. H. A. Baylis on a 



Fig. 3. 



KSe/ff, 



Heterorchis crumenifer. 



Fig. 3. — Sagittal section, sligbtly to the right of tlie middle line (partly 

 diagrammatic). B.^ " bladder " of excretory vessel ; C'.>S'., cirrus- 

 sac ; (J. v., collecting excretory vessel ; D., diverticulum of 

 excretory sac ; E.Ap., aperture of excretory sac ; E.S., cavity 

 of excretory sac (on the ventral side of the sac part of its 

 epithelium has become separated from the basement-membrane) ; 

 O.S., oral sucker ; R.S., receptaculum seniinis ; S., shell-gland ; 

 Ut., uterus ; Vru/., vagina ; V.S., ventral sucker ; V.Setn., 

 vesicula seminalis. 



Fig. 4. — Outline drawing of three eggs, highly magnified. In two of 

 them the operculum is partlv separated from the rest of the 

 shell. 



