CEPHALOPODA. — BERRY. 



213 



pairs may be distinctly counted, their horny rings having each 

 about 9-10 long, acute, slender teeth on the upper margin 

 (Fig. 1). Hook and sucker-bearing faces of all arms bordered 

 by delicate trabeculate swimming membranes, the ventral 

 membranes of the third pair perhaps a trifle the best developed. 



TABLE IV. — Enoploteuihis galaxias. 



Hectocotylized Arm in the male (the right ventral) only 

 slightly modified ; the basal seven-tenths seemingly normal 

 in every way ; just above the 8th hook of the ventral row, the 

 ventral marginal membrane suddenly thickened and widened 

 to form an elongate, sinuous flap, at its maximum somewhat 

 wider than the corresponding oral face of the arm, becoming 

 suddenly narrower at the 13th hook and then continuing only 

 slightly wider than usual to the sucker-bearing portion of 

 the arm ; dorsal membrane homologously modified, the 

 enlargement beginning a little further distally, opposite about 

 the 10th hook, at first becoming somewhat more ample and 

 sinuous so as to give the appearance of forming two rounded 

 lobes, but not reaching its maximum till a third lobe which 

 begins opposite the 12th hook, continuing to the 14th ; the 

 latter membrane here semilunar in outline and at its widest 

 point, opposite the 13th hook, about twice as wide as the arm 

 face though not so wide as is the ventral membrane at its 

 widest expansion. The last three pairs of hooks and the first- 

 sucker or two are crowded between the membrane so as to 

 appear practically in single file. The modified membranes 

 appear to lose their trabeculate structure, perhaps because the 

 cross bars are not thickened in proportion to the intervening 



