COLOSSAL CEPHALOPODS. 



dered by a rather broad, regularly scalloped, marginal membrane, 

 the scallops corresponding to the large suckers. On the other 

 edge there is a narrower and thinner membrane, which runs all 

 the way to the tip of the arm, just outside the suckers. In one of 

 the rows of large suckers there are eleven, and in the other ten, 

 above half an inch in diameter, but each row has at either end one 

 or two smaller ones, from a half an inch to a quarter of an inch in 

 rig. 4. diameter, so that either twelve or 



thirteen might be counted as be- 

 longing to the rows of large suck- 

 ers. The largest of these (fig- 4, 

 a) are from 1 to 1*15 inches in di- 

 the margin. These are 

 attached by strong, though slender, 

 pedicels, so that their margins are 

 elevated about an inch above the 

 Suckers from long arms of No. 5. surface of the arm. Each one is 

 Natural size. situated in the centre of a pentag- 



onal depressed area, about an inch across, bounded by ridges, 

 which alternate regularly, and interlock on the two sides, so as to 

 form a zigzag line along the middle of the arm. These large 

 suckers are campanulate, and somewhat oblique; the marginal 

 ring is strong, and sharply serrate all around. The small marginal 

 suckers (fig. 4, 6) are similar in structure, but more oblique, and 

 mostly only -3 to -4 of an inch in diameter ; they are attached by 

 much longer and more slender pedicels, and their marginal teeth 

 are relatively larger and more incurved, especially on the outer 

 margin. By reason of their longer pedicels they rise to the same 

 height as the large ones. The third, or terminal division of the 

 arm, gradually becomes much compressed laterally, and tapers 

 regularly to the tip, which is flat, blunt, and slightly incurved. 

 Just beyond the large suckers, where this region begins, the cir- 

 cumference is 3-5 inches. The face is narrow and bears a large 

 number of small serrate and pedicellate suckers, arranged in four 

 regular alternating rows, and gradually diniiuMung in size to the 

 tip of the arm, where the rows expand into a small cluster. These 

 suckers are much like the marginal ones of the previous division* 

 and at first are about -25 of an inch in diameter, but decrease to 

 about -10 of an inch near the tip of the arm. The lateral mem- 

 brane or fold of skin, of the preceding divisions, recedes farther 



