24 ■ ON CEPHALOPODA FEOM THE CALCUTTA MUSEUM. 



Histiopsis Hoylei, n. sp. 



Fig. 62. Lower view, nat. size. 



63. Enlarged view o£ the mouth, buccal membrane, and the base of the arms. 



64. Enlarged view of the right side o£ the head. 



65. Enlarged view of the tentacular club. 



66. Upper view in outline of the mantle and fins, nat. size. 



67. Enlarged side view of a large tentacular sucker. 



68. Enlarged left-side view of the funnel and mantle-edge. 

 69 & 70. Enlarged side and front views of an arm-sucker. 

 71. Upper view of the pen, nat. size. 



Plate 5. 



Taonius abyssicola, n. sp. 



Fig. 72. Lower view, nat. size. 



73. Inner view of a portion of the dorsal arm, enlarged. 



74. Enlarged view of the base of the head and siphon and mantle slit up along the median line and 



turned aside. 



75. Funnel-organ, lower view, removed from its place on the wall of the siphon, indicated by a 



dotted line in fig. 74, enlarged. 



76. Enlarged view of the olfactory papilla. 



77. Side view of an arm-sucker, enlarged. 



78. Horny ring of the same, enlarged. 



79. Enlarged view of a portion of the horny ring of a small sucker at the base of the tentacular 



club. 



80. Front (a) and side (6) views of a tentacular sucker. 



Octopus globosus, Appellof. 

 Fig. 81. Enlarged view of the extremity of the hectocotylized arm. 



Octopm pictus (Brock), vax.fasciatus, Hoyle. 

 Fig. 82. Enlarged view of the extremity of the hectocotylized arm. 



Octopus microphthalmus, n. sp. 



Fig. 83. Lower view, nat. size. 



84. Lower (a) and upper (6) mandibles, enlarged. 



I 



