56 CEYLON PEARL OYSTEli REPORT. 



EXPLANATION OF PLATE. 



Fig. 1. Staiirohothrivm (etiobaticUs. x 12. 

 ,, 2. Anterior end of the same more highly magnified. 

 3. Tetragonoc&phabi/m trygonis. x 24. 



4. Another head of the same, showing different dimensions, x about 75. 

 5. Some mature proglottides of the same more highly magnified, showing the dumb-bell-shaped 



uterus. 

 ,, 6. Transverse section through the same, showing the penis, the genital recess, and the narrow part 



of the uterus. 

 ,, 7. Another transverse section, showing the opening of the genital recess to the exterior. 

 8. A third transverse section nearer the end of a proglottis, showing the uterus taking up almost 



all the space. 

 9. Tetragonocephaht/m cetidbatidis. x about 20. 

 ,. 10. The head of the same, x 75. 

 ,, 11. Distomv/m paMeniscwm. Ez.bl., excretory vesicle ; Ov., ovary ; Sh.gl., shell glands; 7'., testis; 11., 



uterus; Y.g., yolk glands ; Y.d., yolk ducts ; ^, male, and $, female, reproductive pores. 

 ,, 12. Cheiracanthus spinosisdmus, head end. 

 ,, 13. The same, tail end. 



