EXPLANATION OF PLATES. 



Letters which liai-e the same meaning in the different figures. 



b. Muscular bulbs, whose use is to evert the r. a. Reproductive aperture. 



proboscides by pressure on fluid with r. m. Retractor muscle of proboscides. 

 which they are filled. sh. Proboscis sheath. 



c. Cirrus. t. Testes. 

 c. p. Cirrus pouch. u. Uterus. 



g. Rudiment of genitalia. v. Vagina. 



/. m. Longitudinal muscle. v. d. Vas deferens. 



/. ?'. Lateral vessel. v, g. Vitelline glands. 



o. Ovary. y. d. Vitelline duct. 



In all cases the actual size of the object sketched in the several figures is given. 



PLATE i. 

 Dibothrium sp., from Atherina laticcps. 



1. Larva in cyst, sketched from life, actual length of larva 2.8 mm. 



2. Same, flattened, mounted in balsam, length of larva 3 mm. 



Rhinebothrium sp., from Dasyatis say. 



3. Head, neck, and anterior segments sketched from mounted specimen. Actual length 



of neck 0.14 mm. 



4. Posterior segments, balsam. Actual length of last segment 0.35 mm. 



Undetermined cestode from Carcharhinus platyodon. 



5. Memorandum sketch of living worm ; length of bothrium 0.29 mm. 



6. Sketch of same, specimen mounted in balsam ; diameter of head 0.40 mm. 



7. Fourth segment from last, in balsam ; actual length 0.60 mm. 



Discocephalum pileafiiin from Carcharhinus platyodon. 



8. Segmenting ova; actual size 0.035 by 0.032 mm., in the t\vo principal diameters. 



Sketches made from living ova. a, July 12; b, July 13; c, July 14. 



PLATE 2. 

 Pedibothrium globicephalum gen. et sp. nov., from Ginglimostoma cirratnm. 



9. Head and neck, flattened, life; actual diameter of head 1.8 mm. 



10. Head and neck, balsam ; actual diameter of head I mm. 



11, 12. Single bothria, life; actual lengths 0.86 and 0.92 mm. 



13. Typical hook, side view ; actual length 0.086 mm. 



14. Pair of hooks, from small specimen ; actual length 0.085 mm. 



15. Segments with rudiments of reproductive organs, balsam; actual breadth 0.35 mm. 



16. Free, mature segment, balsam; actual length 1.8 mm. 



PLATE 3. 

 Pedibothrium longispine gen. et sp. nov., from Ginglimostoma cirratnm. 



17. Sketch of a strobile, life; actual length of bothrium 0.35 mm. 



18. Head, balsam; maximum diameter of head 0.32 mm. 



19. Hook; actual length 0.16 mm. 



187 



