NOTE ON A LARGE SQUID. 319 



C. SiplioD with 2 bridles. 



a. Ear-shaped socket of mantle. 



«!. No sinus. Fins subtenniual and rounded. Ventral arms large and 

 with lateral membrane. 



9. Arms very unequal, 2 rows of toothed suckers to first 3, and 

 1 row to ventral .arms (?). Club of tentacle with sessile suckers 

 and membrane, 4 rows down the stem. Spoon-shaped olfactory 

 organ. Pen with hollow cone. Doratopsis (de Roche., 1884). 



10. Arms with 2 rows of toothed suckers. Tentacles extremely long, 



suckers along stem, large club with long curved toothed 

 suckers and spoon-shaped extremity. Buccal membrane with 

 7 lobes. Six buccal aquiferous openings. Spoon-shaped olfac- 

 tory organ. Pen lanceolate. Cheiroteuthis (d'Orb., 1839). 

 i'. Small sinus. Lateral membrane of arms very small. 



11. Arms with 2 rows of nearly smooth suckers. Tentacles long and 



lash-like, numerous minute toothed suckers at end. Six lobes 

 to buccal membrane. Pen narrow, with cone. Fins rhomboidal. 

 Socket without pronounced tooth. 



Mastigoteuthis (Verrill, 1881). 

 h. l-shaped socket (except Ancistrocheirus ?) 

 a'. Without sinus. 



a'. Fins of separate filaments. 



12. First 3 pairs of arms with 4 rows of smooth suckers. Ventral 



arms with 2 rows, and lateral membrane. Club of tentacles 

 with many rows of smooth suckers. Fins of muscular 

 filaments joined only at base. (Small sinus ?). 



Chteuopteryx (Appelof, 1888). 

 h^. Fins rhomboidal. Pen lanceolate. 



13. Arms with 2 rows of toothed suckers. Tentacles long and 



slender, with suckers along whole length ; club with 

 lateral membrane and numerous small suckers. Lobes of 

 buccal membrane indistinct. 



Brachioteuthis (Verrill, 1881). 

 c'. Fins rounded. 



a'. Pen with cone. 



14. Arms with 2 rows of suckers, smooth proximally and 



toothed distally. Club of tentacle with 4 rows of 

 smooth suckers and group with tubercles (conn. app.). 

 Buccal membrane with 7 lobes. Pen broad, hollow, bent 

 at tip, and with small cone. Calliteuthis (Verrill, 1880). 

 h^. Pen lanceolate. 



15. Arms with 2 rows of suckers, the 3 dorsal pairs of arms 



joined by a web, and the ventral joined by a web. 

 Tentacle with 6 rows of toothed suckers on club, and 

 conn. app. extending down the stem, cluster of smooth 

 suckers at tip. Four buccal and 2 brachial aquiferous 

 openings. Buccal membrane with 6 lobes. 



Histioteuthis (d'Orb., 1839). 

 i'. With sinus. 



a^. Without hooks. 



a^. Pen with cone. Nuchal crests small or absent. 



16. Arms with 2 rows of toothed suckers and slight web. 



Club of tentacle with 4 rows of tootlied suckers dis- 

 tally and 10 rows of smooth suckers proximally. Buccal 

 membrane with 7 lobes. Fins rounded. 



Tracheloteuthis (Stp., 1881). 



17. Arms with 2 rows of toothed suckers. Club of tentacles 



with 4 rows of toothed suckers and lateral membrane. 

 Conn. app. extending along the stem, cluster of smooth 

 suckers at tip. Fins forming an arrow-head. 



Architeuthis (Stp., 1856). 

 6*. Pen lanceolate. Nuchal crests. 



18. Arms with 2 rows of smooth suckers. Tentacles mere 



stumps. Chauuoteuthis (Appelof, 1890). 



NEW SERIES. — VOL. 11^ NO. IV. 25 



