EXPLANATION 01' PLATES. 



Anthobothrium laciniatum Linton. 



Fig. 1. Scolex and anterior portion of strobile ; balsam ; length of portion 



sketched 3.5 mm. From CarcharMnus milberti. 

 la. Last proglottis of strobile, the anterior end of which is shown in fig. 1 ; 



length 1.12. 

 lb. Scolex ; balsam ; breadth 0.6. 

 Ic. Everted cirrus of adult proglottis, from Raja eglanteria; life; length 



approximately 0.4. 



Rhinebothriutn maccallumi, new species, from Dasybatis centrura. 



Fig. 2, Free-hand sketch of specimen mounted in balsam ; length about 28 mm. 



3. Free-hand sketch of another scolex, compressed ; diameter of scolex 1.47. 



4. Camera lucida sketch of bothrium, showing arrangement of loculi ; 



length 0.45 mm. 



Crossobothrium angustum Linton, from CarcharMnus obscurus. 

 Fig. 5. Egg; life; length 0.15. 



Monorygma, species, from Raja stabuUforis. 



FiOr. 6. Scolex and anterior part of strobile ; alcohol ; diameter of scolex 0.56. 



Discocephalum pileaium Linton, from Scoliodon terrae-novae. 



Fig. 7. Scolex in different states of contraction ; free hand from life ; diameter 

 of scolex 0.80. This form from the sharp-nosed shark has relatively 

 smaller scolex, and larger pseudoscolex than the type from the tiger 

 shark. 



Plate 2. 



Orygmatobothrium forte, new species, from Cestracion zygaena. 



Fig. 8. Scolex, nearly front view ; balsam ; breadth 0.72. 

 9. Section of scolex ; diameter 0.58. 



10. Portion of section of bothrium, showing two nei've cells in the midst 

 of the muscle fibers, thickness of bothrium 0.06. 



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