292 



BULLETIN OP THE BUREAU OF FISHERIES. 



Arms stout and muscular, apt to be heavily recurved and coiled in alcoholic specimens; at first 

 rapidly tapering, but attenuate at the extremities; length moderate, perhaps three to four times that 

 of the body; on the average probably subequal, but variable, in the adult the ventral pair usually a 

 little the longest. Umbrella only moderately developed in the specimens seen; about equal all round, 

 and continued as a prominent contractile web along the outer margins of all the arms. Suckers large, 

 rather flattened, and closely set except along the distal portions of the arms, where the two rows become 

 relatively much more widely separated, a character not shown by the figure in the Challenger report; 

 first four suckers at the base in a single row. In the male from two to four suckers opposite the umbrella 

 margin on each arm undergo a slight enlargement. 



The third right arm in the male is not very much shorter than its mate and the hectocotylized 

 portion is very small. The calamus is poorly developed and does not show the usual papilliform struc- 

 ture; ligula extremely small, its inner surface excavated and provided with about 10 easily obscured 

 transverse ridges. (PI. xlviii, fig. 6.) 



Color of preserved specimens everywhere a dull drab or stone gray, lighter below and on the inner 

 surface of the umbrella and arms; dorsally the surface is so heavily clouded with a dark slate as to be 

 almost unicolored, but in the lighter areas and when the folds of the skin are stretched apart the dark 

 pigment is seen to be disposed in narrow anastomosing veins which are here and there very conspic- 

 uous. 11 A series of confluent blotches of similar tint extends along the flattened sides of the arms just 

 outside the suckers and in rough alternation with the latter. In well-preserved material there is a 

 large roundish oculation a little way in front of and below the eye on either side ; the very dark center 

 is surrounded by a broad ring of lighter tint which is not always easy to make out; the entire spot is often 

 somewhat obscured owing to the heavy pigmentation generally, but as it is conspicuously present in 

 at least one of the male specimens examined, it is clearly not to be looked upon as a sexual character. 

 The color in life is not known. 



Beak and radula not examined. 



Measurements of Polypus marmoratus. 



Number in author's register. 



183 



183 



183 



183 



I8 S 



Total length 



Tip of body to dorsal base of umbrella 



Width of body 



Length of body 



Width of neck 



Width across eyes 



Mouth to tip of right dorsal arm 



Mouth to tip of left dorsal arm 



Mouth to tip of right second arm 



Mouth to tip of left second arm 



Mouth to tip of right third arm 



Mouth to tip of left third arm 



Mouth to tip of right ventral arm 



Mouth to tip of left ventral arm 



Length of hectocotylus 



Length of umbrella between dorsal arms . 

 Length of umbrella between ventral arms. 

 Length of funnel 



mm. 

 38 



41 

 ? 

 °3io 

 a 340 

 "335 

 O2S0 

 tt J9S 



"345 



0340 



4 



26 

 29 

 <"iS2 

 oiSs 

 "i88 

 190 

 "165 

 "195 



32IO 



215 



I. 



25 

 25 



mm. 

 59 

 17 



8 

 11 

 37 

 24+ 

 40+ 

 38 

 24 

 42 

 37 

 39 



mm. 

 68 



64. 



8 



5 



mm. 

 62 

 16 

 13 



mm. 

 59 



mm. 

 45 

 13 



27 

 29 

 31 

 32 

 29 

 30 



4 

 4-5 



a Largely estimated, but figures given for what they may be worth. 



Total diameter of ocular spot, right side (S. S. B. 175) . . . 

 Total diameter of ocular spot, left side (S. S. B. 175) .... 

 Diameter of dark center of spot, right side (S. S. B. 175). 



o From this feature arises the significance of the name marmoratus. 



