EXPLANATION OF PLATE LXXXI. 



Fig. L — Polypus, cf australis $ [536], funnel laid open along 

 medio -ventral line to show the funnel organ. Drawn 

 by R. N. Wenzel. 



Fig. 2. — Polypus variolatus 3" [527], funnel laid open along 

 medio-ventral line to show the funnel organ. 

 Drawn by R. N. Wenzel. 



Fig. 3. — Polypus variolatus 3 [527], portion of oral face of 

 left second arm (sucker pairs 6-19 inclusive), showing 

 enlargement of certain svickers. 



Fig. 4. — Opisthoteuthis pluto [468], an areola in the systole 

 state from integument of aboral surface of a medium 

 sized specimen. 



Fig. 5. — Another areola from same specimen, showing dia- 

 stole condition ; same scale. 



Fig. 6. — Opisthoteuthis persephone [478], an areola in the 

 systole state from integument of aboral surface of 

 small specimen from 150 fathoms, south of Eucla. 



Fig. 7. — Opisthoteuthis ■ persephone [480], an areola in the 

 diastole state from integument of aboral surface 

 of type specimen ; same scale as last. 



