1 6 HOYLE, Geneva of Recent Dibranchiate Cephalopoda. 



'Cartilaginous articulation of the funnel fused with that 



of the mantle SymplectoteutktsP 



Cartilaginous articulation free 71 



(Ventral surface of the mantle with regularly arranged 

 tubercles and depressed pits Hyaloteufhis. 

 Ventral surface smooth 72 



'Tips of the arms, slender, elongated and with very 

 numerous minute suckers ; trabeculse of the lateral 

 membrane of the arm extending beyond the web 

 ^^j itself, except in the third pair Dosidicus. 



Arm tips normal; membrane on the ventral side of 

 second and third arms much developed ; web 

 ^ scarcely overpassed by the trabeculse Sthenoteuthis. 



'Tentacle round and tapering to the extremity ; no club 

 formed ; surrounded at the tip with numerous small 

 '73- i suckers Mastigoteuthis . 



Tentacle with a club-like expansion 74 



'Tentacle very long, many times the length of the 

 mantle ; tentacle club with a well developed sucker 

 at the extremity ; club without a web ; no longi- 

 tudinal ridge in the siphonal 2xi\cv\2A\.o\\. . .Chiroteuthis"'^ 



74- i 



75 ■ 



Tentacle not exceeding the mantle in length ; club 

 provided with a web and a rudimentary sucker at 

 the end ; siphonal groove with a longitudinal ridge 



Doratopsis.^^ 

 ' Nuchal cartilages developed ; pen prolonged beyond the 

 first fin, and bearing an accessory fin (often lost) ; 

 arms with pigmented extremities. 



(Grimalditeuthid^) Grimalditeuthis. 



Mantle fused with head in nuchal region ; no accessory 

 fin; arms with extremities normal 76 



