CEPHALOPODA. BERRY. 



255 



along its entire length with a narrow dorsal membrane or 

 keel, which is widest at about the proximal third, then 

 gradually narrows to the tip, while proximally it extends 

 for a considerable distance below the suckers ; proximal 

 one-sixth to one-seventh of the club, reckoning the latter as 

 co-extensive with the dorsal keel, bare ; for the remainder of 

 its length covered on the oral aspect A\-ith a great number of 

 excessively minute suckers so small as to appear to the eye 

 or even under weak magnifications as a mere velvety pilosity. 



Fig. 46. — Rossia australis J [539], isolated sucker 

 and pedicel from central portion of left tentacle club ; 

 camera drawing from a mount in balsam. 



Under higher power suckers seem to be borne on long, slender 

 pedicels, only loosely crowded ; mostly with a diameter of 

 about 0.075 mm., but a few measuring as much as 0.09 mm., 

 and one noted to have a diameter of 0.11 mm., though this 

 last may have been somewhat crushed by its cover glass ; 

 counting uncertain, but about 50 apparently numerable in 

 a transection of the club near its centre (Figs. 45-46). Under 

 favorable light and relatively high power (170 diam.) homy 

 rings apparently toothed ^^ith very small, acute sharp teeth 

 for at least half their circumference, but whether these are 

 true teeth and not merely projecting papillse from the papil- 

 lose area, I cannot be certain. 



Gladius slender, lanceolate, shorter than the body.* 



Fig. 47. — Rossia australis $ [540], three rows of teeth from radula ; 

 camera drawing from a mount in balsam. 



*In the specimen dissected the gladius was found too badly broken for 

 iiguring. 



