108 CEYLON PEARL OYSTER REPORT. 



EXPLANATION OF PLATES. 



PLATE I. 



Fig. -1. Epibdclla (Benedenia) macrocolpa, n. sp. Ventral view, x 10. (For letters, see fig. 3.) 

 2. Posterior sucker of the same species, with the three pairs of hooks, x 20. 

 ,, 3. Genital organs of the same species, x 30. 



eg., cerebral ganglion with the two pairs of eyes ; ev. ev. (only in fig. 1), excretory 

 vesicles; ga., genital atrium; ic. ic., intestinal cceca; In. In., longitudinal nerve; 

 oot., ootype ; ov., ovary ; p. penis ; ph., pharynx ; t., testes ; ut., uterus ; v. vagina ; 

 ve., vasa efferentia ; vi. (only in fig. 1), vitellarium ; yd. yd., yolk ducts ; yr., yolk 

 reservoir. 



4. Steplianocliasmus ceylonicus, n. sp. Ventral view of the living larva after liberation from cyst. 

 (Drawn by JAMES HORNELL.) x 24. 



ic., intestinal coeca; ev., excretory vesicle; ex. t., paired diverticula of the excretory 



vesicle ; os., oral sucker ; t., testes ; v.s., ventral sucker. 

 ,, 5. Same. Lateral view of the anterior end. Leitz. Obj. 3, Oc. 3. 



ic., intestinal coeca ; ph., pharynx ; pr., prsepharynx ; vs., ventral sucker. 

 6. Same. Ventral view of the oral sucker. Leitz. Obj. 5, Oc. 3. 

 7. Aeanthocolpus liodorus, n. gen., n. sp. Ventral view, x 30. 

 ,, 8. Same. Lateral view, x 30. 

 9. Schistorchis carneus, n. gen., n. sp. Ventral view of the living worm. Natural size. (Drawn by 



JAMES HORNELL.) 



,, 11. Ventral view of another specimen somewhat squeezed and lying in creosote, x 6. 

 12. Ventral view of a young specimen containing but a single egg in its uterus, x 10. 



PLATE II. 



Fig. 10. Schistorchis carneus. Ventral view of a specimen lying in alcohol, x 8. 



,. 13. Gastris censors, n. gen., n. sp. Ventral view of an adult specimen lying in alcohol, x 8. 



14. Ventral view of another specimen somewhat squeezed and lying in creosote, x 10. 



15. Dorsal view of a third specimen squeezed in a similar manner, x 10. 



16. Ventral view of the fourth (young) specimen, x 20. 



17. Anaporrhutum laryum, n. sp. Ventral view, x 12. 



18. Dietomum, sp., from Pinna. Lateral view, x 38. 



