65- 



66 



67.1 



HI aiichesier Memoirs, Vol. x/vzYi. (igo4), No. 21- IS 



'Fins rhomboidal, extending the whole length of the 

 mantle ; siphonal cartilage with a longitudinal groove 

 from which a shorter one branches out ventrally, 

 thus H ..(Thysanoteuthid^) Thysanoteuthis. 



Fins usually sagittate, broader than long; siphona 

 cartilage with longitudinal groove, crossed by a 

 posterior shorter transverse groove ; thus _!_. 



Ommastrephid^. 66 



(Animal small, pelagic ; tentacles fused into a proboscis- 

 like organ Rhynchoteuthis }^ 

 Animal large, or moderately large, tentacles normal 67 



^Funnel groove smooth, without a furrowed area (foveola) 

 in its anterior portion ; tentacles with no fixing 

 apparatus 68 





j Funnel groove with a foveola ; tentacles with fixing 



apparatus 69 



Eight rows of suckers at the end of the tentacular club ; 

 rings of large tentacular suckers smooth lllex.^ 



68.^ 



69. 



Four rows of suckers at the end of the tentacular club ; 

 large tentacular suckers with more than 30 acute 

 teeth Todaropsis. 



Sucker bearing portion of the tentacle extending more 

 than half its length : fixing apparatus consisting of 

 only a few pads and suckers, only distinguished 

 from those of the dorsal row by small size and 

 insignificant teeth OvimastrephesP 



Tentacle club less than half the length of the organ ; 

 fixing apparatus a distinct carpal group of pads and 

 small suckers 70 



