14 HOYLE, Genera of Recent Dibranchiate Cephalopoda. 



'Arms with more than two irregular rows of suckers ; 

 tentacles with more than four rows of minute 

 suckers ; pen narrow anteriorly, with an expanded 

 portion occupying the posterior half. 



(Bathyteuthid^) 63 



62. -< 



Arms with two rows, tentacular club with numerous 

 (8 or more) rows of suckers ; fin, rhomboid or 

 cordate, transversely elongated. 



(Tracheloteuthid^) 64 



'Body, subgelatinous in texture ; colour deep red ; fins 



small, subterminal Bathyteuthis}^ 



63.- 



64 -i 



Fin extending along the greater part of the mantle ; 

 supported by a series of parallel muscular trabeculse, 

 producing a resemblance to the fin of a fish 



Ctenopteryx}^ 



(Yvs\ subcircular, of moderate size, length and breadth 

 not exceeding half those of the mantle ; tentacular 

 club in the middle with four rows of medium-sized 

 suckers, which diminish somewhat distally ; proxim- 

 ally with many rows of quite small suckers, which 

 are continued along the stem, first in four and then 

 in two rows ; pen with hollow cone, whose walls 

 coalesce for a short distance at the extreme tip ; 

 the cone forming from a half to a third of the whole 

 length of the pen Tracheloteuthis}^ 



Fin transversely rhomboidal, large, its length more than 

 half, its breadth more than five-sixths of the length 

 of the mantle ; tentacular club with many (about 

 sixteen) rows of very small suckers, of which the 

 middle ones are larger ; a few suckers are scattered 

 over the stem ; pen with a terminal hollow cone, 

 whose margins do not seem to fuse, constituting 

 two-fifihs of the length of the pen Brachioteuthts}^ 



