PLATE VIII. 



Class PLATYHELMINTHES-confcwMed. 



TREMATODA. 

 THE LIVER-FLUKE (Distomum lanceolatum). 



FIG. 1. DISTOMUM : VENTRAL VIEW, x 2. 



. anterior sucker : p. posterior sucker. 



FIG. 2. MATURE DISTOMUM : VENTRAL VIEW. (After Sommer.) x 5. 



m. mouth : ph. pharynx : c. part o,. the digestive system : p. penis 

 (cirrus) : u. uterus : o. ovary : s. shell gland : y. yolk gland : 

 d. duct of the yolk gland : t. testis : v. 1 , v."* vasa deferentia. 



FIG. 3. YOUNG DISTOMUM. (After La Valette.) 



m. mouth : ph. pharynx : i. intestine : s. posterior sucker : t. trunk of 

 the water- vascular system : d. main duct : p. excretory pore. 



FIG. 4. CILIATED EMBRYO : CONTRACTED. (After Leuckart.) 



FIG. 5. CILIATED EMBRYO : ATTACHED TO THE WALL OF THE PULMONARY 

 CAVITY OF Limnceus truncatulus. (Partly after Leuckart). 



FIG. 6. SPOROCYST : with c. cercarite. (After Leuckart.) 



FIG. 7. KEDIA. (After Leuckart.) 



m. mouth : ph. pharynx : i. intestine : c. cercaria. 



FIG. 8. CERCARIA. (After Leuckart.) 



s. sucker : i. intestine : e. excretory organ. 



