ART. 21. PARASITES OP SHARKS AND SKATES LINTON. HI 



Plate 11. 

 Rhynchobothrium insigne, new species, from Carcharinus milberti. 



Sketches made from specimen mounted in balsam. 

 Fig. 99. Scolex and interior part of strobile ; lengtli of scolex 20 mm. 



100. Proglottis, about 100 mm. from anterior end ; length 3.5. 



101. Proglottis, posterior end of strobile ; length 6 mm. 



102. Abnormal proglottides, about 80 mm. from anterior end ; breadth 5 mm. 



103. View of proboscis near base ; diameter, excluding hooks, 0.21. 



104. Tip of proboscis, same side as tliat shown in fig. 103 ; two hooks of the 



linear row appear on the inverted border ; diameter, excluding 

 hooks 0.16. 



105. Linear row of closely placed hooks, at its beginning near the base of 



the proboscis ; camera lucida sketch with Spencer No. 6 ocular and 

 4 mm. objective. 



106. Linear row of hooks, about 0.9 mm. from base of proboscis, same mag- 



nification. 



107. Same, about 1.4 mm. from base of proboscis. 



Plate 12. 



Rhynchobothrium, species, from cyst on viscera of Ceratacanthus schoepfii. 



Fig. 108. View of proboscis, near base ; diameter, excluding hooks, 0.075 ; 

 balsam. 

 109. Anterior end of proboscis, so far as it was everted ; diameter, exclud- 

 ing hooks, 0.054. 



Rhynchobothrium longispine Linton. 



Fig. 110. View of proboscis near base ; diameter, including hooks, 0.054 ; from 

 Microgadus tonicod. 



111. Same, near middle ; diameter, including hooks, 0.062. 



112. Same, near tip ; diameter, including hooks, 0.036. 



113. View of proboscis near base ; diameter, including hooks, 0.048 ; from 



Paralichthys dentatus. 



114. Same, near tip ; diameter, including hooks, 0.030. 



Rhynchobothrium, species, from flesh of Cynoscion regalis. 



Fig. 115. Proboscis, so much as was everted ; diameter, excluding hooks, 0.18. 

 116. View of opposite side from that shown in fig. 115. 



Plate 13. 



Otobothrium crenacolle Linton. 



Cysts in flesh of Poronotus triacanthus. 



Photographed by Roy W. Minor, in the summer of 1909, Woods Hole, 

 Massachusetts. 



