CEPHALOPODA. — BERRY. 269 



•siderably larger than those occupying 



corresponding positions on the four 



dorsal arms ; suckers of ventral pair 



averaging 2-3 times the diameter of 



those of the dorsal pair, the latter 



seemingly particularly minute in the cT ; 



horny rings of arm suckers (Fig. 56) 



smooth, or with faintly wavy margins. yjg 5^,_sep{a chiro- 



-r r, .1 7 . , T 7 im frema 2 [o24], horny 



Left ventral arm nectocofyhzed (PI. ^-^^ ^f 7th sucker from 



Ixxiv., fig. 6) ; basal two-fifths of arm base of dorso-central 

 normal, bearing ten quartets of suckers series of right third arm; 

 which begin rather small, increase to a camera dravrmg. 

 maximum by about the 5th or 6th 



quartets, then gradually diminish again distal ; 

 at the 11th quartet, suckers shoAdng a considerable and 

 more abrupt diminution in size ; 12th-13th quartets similar 

 to 11th, but once again regularly smaller; from about the 

 14th quartet entire remaining segment of arm strongly com- 

 pressed laterally, the marginal membranes, especially the 

 dorsal, becoming relatively wider, thickened, and elevated 

 (PI. Ixxiv., figs. 7-9), forming between them a narrow groove, 

 in and along which the now very minute suckers continue 

 until all details become indistinguishable near the tip of the 

 arm. 



Umbrella short, attaining its greatest extent between the 

 arms of the third and fourth pairs ; between the ventral arms 

 of the ? rudimentary, somewhat better developed at this 

 point in the cJ*. 



Tentacles more or less compressed, stout, very long, the 

 length varying in different specimens from slightly more than 

 that of the mantle to nearly twice the mantle length ; inner 

 face smooth, flattened. Club (PI. Ixxiv., figs. 4-5) large 

 flattened, well expanded, the expansion largely due to the 

 broad, fleshy keel which, commencing on the outer angle of 

 the carpal region, becomes deflected dorsally as it passes 

 distal, so that its major plane comes to lie parallel to and 

 with its face continuous with the sucker-bearing face of the 

 club ; remainder of expansion due to the very broad and 

 dehcate ventral " swimming membrane," which, near the 

 centre of the club, attains a width somewhat greater than 

 the club itself ; companion membrane of dorsal side narrower 

 and more thick and fleshy, unique in not being everywhere 

 continuous with the face of the club, but perforated by three 

 large openings or fenestrse (PL Ixxiv., fig. 5), the median of 



