' Challenger ' Cephalopoda. 233 



Hob. North of Papua (Station 220), surface. One speci- 

 men, sex ? 



ClRROTEUTHIS, Eschricllt. 

 Cirroteuthis magna, n. sp. 



The Body is oblong, about twice as long as broad, and 

 rather broader than deep. The mantle-opening is circular, 

 but little larger than the base of the siphon, and its margins 

 are continuous with two ridges on the sides of the latter. The 

 siphon is conical and slightly swollen at the tip ; it is not 

 connected to the head by ligaments. The fins are obovate in 

 form, about four times as long as broad, and thickened along 

 the posterior margin. The dorsal cartilage is saddle-shaped 

 and elongated from side to side, not antero-posteriorly. 



The Head is directly continuous with, and somewhat narrower 

 than, the body ; the eyes are spheroidal, the lens spherical, 

 and the palpebral opening circular. 



The Arms are subequal, three and a half times as long as 

 the body : they are slender and more resemble thickenings of 

 the web than independent arms ; they are thickest about two 

 thirds the distance along them, and terminate in a delicate 

 slender tip, which projects beyond the web. The umbrella is 

 a thin delicate membrane, very largely developed, and when 

 fully expanded its diameter was probably nearly three times 

 as large as its depth. It extends from the tip of the ventral 

 arm on either side backwards and becomes gradually nar- 

 rower, so that it only extends along the proximal two thirds 

 of the next arm, beneath which it passes, to be attached in a 

 crescentic line to the outer surface of the web, which similarly 

 passes backwards from the tip of this arm ; this arrangement is 

 usually described by saying that the arm does not lie in the 

 umbrella for the proximal two thirds of its length, but is 

 joined to it by a vertical web ; but this does not so correctly 

 represent the arrangement. The umbrella stretches across 

 from tip to tip of the two dorsal arms, and between the 

 proximal two thirds of the two ventral arms. The suckers 

 commence about 1 centim. from the oral margin, and the 

 first four lie pretty close together within a space of less than 

 2 centim., after which they gradually become further apart, 

 an interval of 2-3 centim. intervening between each two ; 

 about two thirds along the arm they stand closer toge- 

 ther and are very large, but after this they again become 

 smaller and stand in close contiguity with each other. The 

 proximal suckers are small, prominent, and rather soft, and 

 seem to contract by folding the lateral margins over towards 



