EEPORT ON THE CEPHALOPODA. 85 



This small and possibly immature form differs from Octopus tuberculatus, which 

 it somewhat resembles in the comparative shortness of its arms, in the fewness of its 

 cirri, and more particularly in the shagreen-like internal surface of its arms, which last 

 is its most distinctive peculiarity. 



Octopus marmoratus, Hoyle (PI. VI.). 



1885. Octopus marmoratus, Hoyle, Diagnoses I., p. 227. 

 1885. „ „ Hoyle, Prelim. Eep. I., p. 102. 



Habitat. — On the Reefs, Honolulu, Sandwich Islands. Three specimens, one $ , two $ . 

 Sandwich Islands (Copenhagen Museum). 



The Body is round, not depressed, and a little longer than wide. The mantle-opening 

 extends somewhat less than halfway round the body, terminating nearer to the siphon 

 than to the eye, and considerably behind the latter. The siphon is small and acutely 

 conical, and extends about one-third the distance to the umbreUa-margin. 



The Head is narrow, and the eyes are prominent, where they have not suffered from 

 compression. 



Tlie Arms axe subequal, eight times as long as the body; they are very long and 

 slender, the last character being more marked in the females than in the male ; they 

 taper more rapidly at first than near the extremities, which are much attenuated. The 

 umbrella is very wide, especially in the male, where it extends almost one-third up the 

 arms ; in the females its extent is only one-sixth. The suckers are rather large, and 

 closely set ; in the male a few suckers opposite the umbrella-margin are slightly, but not 

 markedly, larger than the others. The extremity of the hectocotylised arm is small, and 

 has about ten small transverse ridges (figs. 2, 3). 



The Surface appears to have been smooth, except for a few short ridges placed 

 longitudinally on the back and sides ; but the skin is shrivelled by the action of the 

 spirit, so that it is difficult to be certain. A conical cirrus is situated above and slightly 

 behind each eye ; but in some cases this has been destroyed. 



The Colour is a stone-grey, with dark pigment disposed in veins like those of marble "■ 

 on the dorsal surface of the body, head, and umbrella (fig. 1); the male is much darker, 

 so that the marbling is almost concealed. Traces of an oval spot are seen in front of and 

 below the eye on both sides of one female specimen and on one side of the other ; but 

 this spot is concealed by the dark colouring in the male even if it exist. 



1 Hence the specific name. 



