64 



THE VOYAGE OF H.M.S. CHALLENGER. 



mantle. The fins are about equal in length to the breadth of the body, narrow and 

 pointed at the extremity, and thickened towards the posterior margin, and just above 

 the root of each is a loore of unknown function. The dorsal cartilage is much elongated 

 transversely, and is curved almost into the form of a horse-shoe (PI. XIII. fig. 5). 



The Head is exceedingly short, and the eyes large and spheroidal. 



The Arms are subequal, and about three times as long as the body in the present 

 shrunken condition of the specimen ; they taper rather rapidly to slender points. The 

 umhrella extends on the dorsal side of each arm to within 1 cm. of its extremity, whilst 

 on the ventral side it reaches only four-fifths along it ; the arms lie in the umbrella, and 

 are not united to it by any intermediate or vertical web. The suckers are about sixty to 

 seventy in number, small and subequal ; they are at equal intervals for the greater part 

 of the arm, but closer near the extremity. The cirri are short, stout, and conical, the 

 largest 2 mm. in length ; on the ventral arms they commence between the fourth and 

 fifth suckers, and extend to the fiftieth sucker, beyond which there are twenty-one suckers, 

 which gradually decrease ; on the dorsal arms the cirri commence between the sixth and 

 seventh suckers, and continue to the fifty-fifth, beyond which there are nine suckers. 



The Surface is smooth. 



The Colour of the body is creamy white, of the arms and umbrella deep madder-brown. 

 The suckers and cirri are paler. 



Dimensions, 



Breadth of body, . 

 Length of fin. 

 Breadth of one fin, 

 Diameter of largest suclier, 

 Diameter of eye, . 



Length of first arm, 

 Length of second arm. 

 Length of third arm. 

 Length of fourth arm. 



.30 



mm. 



10 



,, 



30 



,, 



1 



„ 



12 



„ 



Right. 



Left. 



100 mm. 



100 mm 



94 „ 



100 „ 



80 „ 



92 „ 



90 „ 



92 „ 



This species is closely allied to the last, the web being attached directly to either side 

 of each arm, so that there is no intermediate web, whilst it passes nearly to the tip on the 

 dorsal but only about four-fifths upon the ventral aspect; furthermore, at the junction with 

 the arm on this side there is a small papilla, but this, besides being smaller, is more inti- 

 mately connected with the arm, and lies less in the web than in the case of Cirroteuthis 

 pacifica; it is marked by a ridge which is a continuation of the margin of the umbrella (PI. 

 XL fig. 2) ; the cirri too, instead of ceasing where the membrane terminates on the ventral 

 aspect of the arm, are continued almost, if not quite, to its extremity. The two species 

 differ in the form of the funnel, in the presence of the pore above mentioned, and the cirri 



