886 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [168] 



PLATE X. 

 Discocephalum pileatum, gen. et sp. nov. 



Fig. 1. Var. a. Head and neck, from life, x 9. 



Fig. 2. Var. (3. Head and neck of living specimen, X 9. 



Fig. 3. Another view of the same, X 9. 



Fig. 4. Outline of median segments, from life, X 6. 



Fig. 5. Outline of posterior segments, from life, var. a, X 6. 



Fig. 6. Outline of section through head, x 38. 



Fig. 7. Section of mature segment, X about 8 ; a, a, ovaries ; b, b, uterine cavities with 

 clusters of ova ; b\ b', uterine cavities without ova; c, vagina; d, base 

 of invaginated cirrus ; e, e, convolutions of the vas deferens ; /,/, testes. 



Bhynchobothrium bulbifer Lt. 



Fig. 8. Free proglottis, from life, X 15 ; a, bulb of cirrus partly protruding from 

 margin of segment ; &, vagiua, near its exterior opening ; c, enlargement 

 of vagina into a receptaculum seminis ; d, d, vessels of the water- vascular 

 system ; e, e, spermatic capsules of testes ; /, cirrus bulb with vas deferens 

 entering the anterior part of the inner extremity; g, g, ova: /«, posterior 

 coils of vas deferens. 



Fig. 9. Cirrus of same everted with escaping spermatozoa, from life. 

 All figures made by Margaret B. Linton. 



