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



PLATE II. 

 Diboihrium piinctatum Rud. 



FIG. 1. Lateral view of bead 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. Far. 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. Far. /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 ; 6, 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 fosste 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. 



