320 NOTE ON A LARGE SCiUID. 



b\ With hooks. Fins rhomboidal. Conn. app. at base of club, and gene- 

 rally group of suckers at tip. 

 a^. Pen lanceolate. 



a*. Fins terminal. Suckers to tentacles. 



19. Arms with 2 rows of hooks. Tentacles short, suckers 



few. Pen slender, cartilaginous. Fins somewhat 

 rounded, terminal. Verania (Krohn, 1847). 



b*. Fins subterminal generally. Hooks to tentacles. 

 a^. Hooks to arms and tentacles. Very large fius, 



20. Arms with 2 rows of hooks. Tentacles with hooks on 



club. Fins large, along nearly whole length of 

 mantle, subterminal. Socket ear-shaped (?). 



Ancistrocheirus (Gray, 184.9). 

 J5. Hooks and suckers to arms and tentacles. 



21. Arms with 2 rows of hooks and a few suckers. Club of 



tentacles with hooks. Buccal membrane with 8 lobes. 

 Fins slightly rounded. Enoploteuthis (d'Orb., 1839). 



22. Arms with 1 row of hooks near base and 2 rows of 



suckers near tip. Club of tentacles with alternate 

 hooks and suckers. Abralia (Gray, 1849). 



J'. Pen with cone. 



a*. Only suckers on arms in 2 rows. Hooks and suckers on tentacles. 

 Buccal membrane with 7 lobes. 



23. Arms with two rows of smooth suckers, and lateral mem- 



brane. Club of tentacle with 2 rows of hooks. Two 

 brachial and 6 buccal aquiferous sacs. Solid cone to 

 pen. Onychoteuthis (Licht., 1818). 



24. Arms with two rows of suckers. Club of tentacles with 



2 inner rows of hooks, and 2 outer of toothed suckers. 

 Cone of pen solid at apex. 



Teleoteuthis (Verrill, 1882). 



25. Arms with 2 rows of smooth suckers. Club of tentacles 



with 2 rows of hooks. Cone of pen hollow. 



Ancistroteuthis (Gray, 1849). 

 b*. Hooks and suckers on arms in 4 rows. 



26. Ventral arms with 4 rows of suckers, the other arms with 



2 rows of hooks within and 2 rows of suckers without. 

 Hooks on tentacles. Buccal membrane rounded. Pen 

 with hollow cone. Fins reach beyond tip of body. 



Gonatus (Gray, 1849). 

 c. Socket with large tooth or process. 



27. Arms with 2 rows of toothed suckers and lateral mem- 



brane. Club with 4 rows of toothed suckers and 

 conn. app. extending along the stem. Sinus. Two 

 apertures at back of siphon. Pen lanceolate. Long 

 fins along whole length of the mantle. 



Thysanoteuthis* (Troschel, 1857). 



D. Siphon with 4 bridles, and 2 apertures at back. JL-shaped socket. 2 brachial, 



2 anal, and 4 buccal aquiferous openings. ' Buccal membrane with 7 lobes. 



Three longitudinal nuchal crests. Eye with sinus. Pen with hollow cone. 



Arms with 2 rows of toothed suckers. 



a. Folds in siphon pit absent, or only within the velum. 



28. Smooth siphon pit. Little or no lateral membrane to arms. 



Teeth absent or blunt on large suckers of club. 



Illex (Stp., 1880). 



29. Folds in siphon pit within the velum. Lateral membrane of arms 



small. Alternate sharp and blunt teeth on one half the cir- 

 cumference of large suckers of club. Todarodes (Stp., 1880). 



* A small specimen of Thysanoteuthis rhombus, Trosch., presented to the Oxford 

 Museum by Prof. Ray Lankester, appears to possess 4 bridles ; this may perhaps be due to 

 the artificial splitting of a single pair. 



