OESTODE AND NEMATODE PARASITES. 93 



EXPLANATION OF THE PLATES. 

 PLATE I. 



Fig. 1. Cephabbothrmm aetobatidis. x 10. Entire worm, drawn from preserved specimen. 



2. The head of the same, x about 35. 



3. The head of the same, drawn from life, x about 40. 



-t. The head of the same, drawn from life, x about 40. 



5. Anterior end of Horm llobothrium cobraformis, with the suckers expanded, x about 100. 



6. The same, with suckers retracted, x about 100. 



,, 7. Outline of edge of body in anterior broad region. 



,, 8. The same, in the narrower posterior region. 



9. Body of H. cobraformis, x 45, drawn from stained specimen. 



., 10. Enlarged view of head, x about 450, showing button-like myzorhynchus and the extended 



suckers. 



11. Kystocephalus translucens. x 16. The head in this specimen is rather diagrammatic. 



12. Head of Kystocephalus trcmshta ns, x about 50, showing the terminal myzorhynchus. 



., 13. Myzoceplialus nwrinari. x 10. 



13a. Posterior proglottis, x about 40. 



,, 14. Head of Myzocephcdus narinari. x about 40. 



,, 15. The same simplified and opened out to show myzorhynchus. x about 40. Semi-diagrammatic. 



16. a, b, c. Bothridia on myzorhynchus, showing outline of shapes assumed. 



,, 17. Myzophyllobothrium rubrum. x 6. (17.) 



., 17a. proglottis from the middle of the body, x 25. 



176. ,, last proglottis, x 25. 



,, 18. ,, head, x 25. 



PLATE II. 



Figs. 19, 20, 21. Myzophyllobothrium rubrum, drawn from living specimens, showing various views of the 

 head. The red pigment spots are represented by black dots. 

 Tetrarhynchus aetobatidis. x 12. 



,, extremity of a proboscis, x about 100. 



showing the more sabre-like teeth at the base of the proboscis, and the 



position of the red granules. 

 Tetrarhynchus, sp, Young form with no proglottides formed, x 40. 



Tip of proboscis, x about 150. 



A series of teeth of the above, showing the gradations of a single ring. 

 Tetrarhynchus, sp. Young form with cyst still present, x about 75. 

 27. Proboscis and teeth of the same. 

 28. Tetrarhynchus gangetieus, head, x 20. 



28a. ,, Still further enlarged view of proboscis. 



,, 29. Tetrarhynchus perideroms. x 12. Showing the coiled portion of the body. 

 ,, 30. ,, the head, x 36. 



,, 30. More highly magnified view of the proboscis of the same. 

 Figs. .'Jli;, b, c. Three views of proglottides of /'. petidt ra us, showing the modification in the pattern as one 

 passes backward. 



