870 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [152] 



PLATE II. 



Dibothrium punciatum Rud. 



Fig. 1. Lateral view of head and first segments, from life, X 27. 



Fig. 2. Marginal view of same, from life, X 27. 



Fig. 3. Lateral view of head, alcoholic specimen made transparent in oil of cloves 



X 22. 

 Fig. 4. Posterior part of strobile, showing characteristic grouping of segments, X 6. 



Dibothrium microcephalum Rud. 



Fig. 5. Var. a, marginal view of head and first segments, from alcoholic specimen, 

 X 24. 



Fig. 6. Posterior end of strobile of same. X 15. 



Fig. 7. Var. (3. Marginal view of head and first segments, from alcoholic specimen, 

 X 24. 



Fig. 8. Outline of posterior segments of same, X 4. 



Fig. 9. The same enlarged, showing ova, X 15. 



Fig. 10. Transverse sections near middle of body ; a, ovary ; b, vas deferens ; c, testes ; 

 d, cirrus bulb and cirrus ; e, layer of longitudinal muscle fascicles ; /, 

 ova, X 33. 



Fig. 11. Collapsed ova, X about 200. 



Fig. 12-18. Transverse sections of head, x 24; Fig. 12, near apex, showing cut ends 

 of longitudinal muscles with a few transverse muscles ; the beginnings 

 of fossse are indicated by crescent-shaped clear spaces with their con- 

 vexities turned toward each other ; Fig. 13, transverse muscles more 

 numerous, crossing each other at right angles, anterior ends of lateral 

 fossae clearly outlined ; Fig. 14, sections near anterior end of head, behind 

 apical cushion; Fig. 15, section near middle of head; Fig. 16, section 

 towards base of bothria ; Fig. 17, section near base of head, bothria no 

 longer united with head ; Fig. 18, section through first segment ; an outer 

 concentric ring is beginning to separate from the inner core to form the 

 posterior salient border of the segment. 

 All figures made by Margaret B. Linton. 





