ILLUSTRATIONS. 



ac. := acetabulum, 



cir. = cirrus. 

 cir. p. = cirrus pouch, 

 exc. p. = excretory pore, 

 exc. tr. = excretory tract. 



f. g. p. = female genital pore. 



g. p. = genital pores, 

 int. = intestinal cceca. 



= Laurer's canal. 



= mouth. 



= male genital pore 



= oesophagus. 



= ovary. 



= pharynx. 



= pre-pharynx. 



= shell gland. 



= testicles. 

 . = transverse vitello- 



duct. 

 iruterus. 



=vas deferens. 



= vitellogen glands. 



= vesicula seminalis. 



(Photographs by Charles Martin, Bureau of Science.) 



Plate I. * 



Fig. 1. Photograph. A group of eight specimens of Fasdoletta ilocaiia, natural 

 size. 



2. Photomicrograph of type specimen from ventral surface. Stained with 



carmine and picric acid. Enlargement about 18. 



3. Semi-diagrammatic drawing showing anatomy. 



4'. Photomicrograph of longitudinal section in median line. Stained with 



carmine and picric acid. Enlargement about 20. 

 5. Semi-diagrammatic drawing showing apparent structure and relations of 



cirrus and cirrus pouch. 



Plate II. 



Figs. 6, 7, 8, 9. Semi-diagrammatic drawings of transverse sections through (6) 

 cirrus pouch just caudad of genital pores; (7) ovary; (8) posterior 

 testicle; (9) plane midway between testicle and caudal extremity. 



Fig. 10. Photomicrograph of ova of Facioletta ilocana and Trichuris trichiura. 



Figs. 11, 12, 13. Photomicrographs of ova (11) in fresh faeces; (12) showing 

 developed miracidium; (13) showing operculum lifted after escape 

 of miracidium. Enlargement about 320. 



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