' Challenger ' Cephalopoda. 223 



specimens and is very minute (about 2 millim. long in the 

 larger) ; it is acutely pointed, and the median groove has 

 three transverse ridges. 



The Surface of the back, dorsal surface of the head, and um- 

 brella is covered with irregular closely set warts, which attain 

 a maximum diameter of several millimetres in the nuchal 

 region; the warts extend on to the ventral surface of the 

 body, where they become much smaller, more even, and 

 average less than 1 millim. in diameter. Above each eye 

 there seems to have been a short cirrus, but these have been 

 rather damaged. 



The Colour is a dull purplish grey, very dark above, much 

 lighter below. 



Hob. Inaccessible Island, Tristan da Cunha. Two speci- 

 mens, $ . 



Octopus Boscii (Lesueur), var. pallida, nov. 



The Body is evenly rounded, with a slight depression in 

 the median ventral line. The mantle-opening extends less 

 than halfway round the body, terminating immediately below 

 the eye, and farther from it than from the base of the siphon, 

 which is long and pointed, has rather a small opening, and 

 extends two thirds the distance of the umbrella-margin. 



The Head is short, and not so broad as the body ; the eyes 

 are only slightly prominent. 



The Arms are subequal, nearly four times the length of the 

 body, and taper evenly to fine points. The umbrella extends 

 one third up the arms and is a little wider laterally than dor- 

 sally. The suckers are closely set, deeply cupped, and marked 

 with regular radial grooves ; their biserial arrangement com- 

 mences immediately after the first. One arm bears a super- 

 numerary sucker in the largest specimen. The circumoral 

 lip is low and narrow. 



The Surface is covered with warts, which are largest and 

 most numerous on the dorsal surface of the body, head, and 

 umbrella, and dorsal aspects of the arms, where they have a 

 quadrifid or quinquefid form, usually with a small wartlet in 

 the centre, each forming a figure like a star or rosette. To- 

 wards the ventral surface and on the sides of the arms the 

 warts are simple and much smaller. On the back are about ten 

 long cirri, which are rough with small warts, and above each 

 eye is a very large arborescent cirrus with six or seven smaller 

 ones beside it. 



The Colour is a pale purplish grey, shading off to a creamy 

 white on the ventral surface. 



llab. Off East Moncoeur Island, Bass Strait, 38 fathoms 

 (Station 162). One specimen, ? . 



16* 



