CEPHALOPODA. — BERRY. 233 



in ventral series beyond their point of cessation dorsally, 

 suckerless ; cushions of dorsal series (PI. Ixv., tigs. 2, 3, 4) 

 immediately upon cessation of dorsal membrane more 

 crowded, transversely compressed, their apices papillose, 

 bases triangular, at the extreme base thin and plate-like, but 

 swelling out almost immediately, especially on the clorso- 

 cUstal angle, where a sort of raised knob is formed ; proximal 

 faces of these structures swollen and subangular, the distal 

 faces hollowed out so as to fit each against the angle of the 

 next distal cushion ; begiiuiing with the twelfth, the dorsal 

 papillae increase gradually in size to about the 15th or 16th, 

 slightly diminish to the 21st or 22nd, then again increase to 

 about the 27th, Mhence they evenly diminish to the tip of 

 the arm, a connecting web nowhere present ; cushions of 

 ventral series veiy differentlj^ modified (PI. Ixv., figs. 2, 3, 5), 

 beginning with the 12th suddenly tranversely -elongate, 

 pointed, slightly sinuous, flaring out like the teeth of a comb, 

 though connected nearly to their tips bj^ the strongly devel- 

 oped marginal membrane, giving them a ridge-like appear- 

 ance ; each ridge flanked proximally by a strongly incurved, 

 membranous fold, beginning near the tip and running across 

 to the distal face of the triangular dorsal " cushion " or papilla 

 belonging to the next proximal pair so as to enclose a deep, 

 transverse, trough-like groove ; at imier termination of each 

 ridge is a short, conical, somewhat distally directed papilla, 

 indicating the point of attachment of the original sucker ; the 

 ridges described attain a maximum at about the 15th or 16th 

 unit (enumerated from the extreme base of the arm), then 

 diminish to the tip ; they are somewhat longer than the 

 opposite papillae of the dorsal row. Left ventral arm in 

 agreement with its mate in number, shape and size of the 

 basal cushions, and in the lack of suckers on the five most 

 proximal cushions, but with its distal portion normal through- 

 out ; length of this arm about one-quarter more than that of 

 the right arm. Other adult S cf agree very closely vdih. the 

 one described in general plan, but in the number of suckers 

 lost and the number and position of those present as well as 

 other minor details show so innumerable slight variations that 

 a complete description of the hectocotylus of any one of them 

 would not exactly coincide with that of any one of the others 

 (an idea of the character and scope of this variation may be 

 obtained from Table IX.). Gross number of enlarged 

 proximal cushions, coincident point of cessation of marginal 

 web and persistent suckers of dorsal row, and persistence of 

 about two unpaired suckers distally in the ventral vow, 

 relatively constant in fully gro^^'n specimens. 



