CEPHALOPODA OF THE HAWAIIAN ISLANDS. 



J 95 



ened and expanded spoon-shaped organ, its inner surface broadly but not abruptly excavated and 

 ornamented with numerous irregular transverse wrinkles or grooves. (PI. xlvi, fig. 2, represents the 

 hectocotvlus of an immature specimen.) 



The surface ornamentation is very distinctive. Body nearly smooth below; above coarsely and 

 irregularly papillose, the papillae ordinarily arranging themselves in fairly distinct longitudinal lines, 

 most noticeable on the nuchal region, but expending anteriorly over the umbrella and posteriorly over 

 the dorsum before becoming obsolete. Certain of these papillae are larger than the 

 others, and in preserved specimens they often become confluent with one another in 

 certain regions of the body to form narrow elongate ridge-like folds of great perma- 

 nency; along the median line are three of these folds, one extending back from the 

 nuchal region for about a third the length of the body, the second some distance pos- 

 terior to it in the same line, but much shorter, and a third still farther back and 

 representing but little more than a single large papilla. Lateral to these are three 

 series of similar ridges; two short ones, which, in conjunction with the two chief 

 median ridges, inclose a dark quadrangular area in the middle of the dorsum; two 

 longer folds external to these and paralleling the anterior median fold; and outside 

 these, two still longer but more or less interrupted ridges extending from the upper 

 edges of the mantle opening well past the middle of the body. There are three 

 rather small bluntish cirri just above each eye opening. 



Color of specimens preserved in alcohol a dull buff, much clouded above with a 

 more or less washed out reddish chocolate, and below with dull ocheror a livid brown. 

 Each of the integumentary ridges which have been described is inclosed in a promi- 

 nent band of buff, and a conspicuous series of areolae or reticulations of the same pale 

 tint are disposed in pairs along the outer surfaces of the four dorsal arms for the greater 

 portion of their length. Gould states the general ground color of the living animal to be orange, but 

 in alcoholic material this fades, and in some specimens the buff bands and areolae may appear not 

 lighter (as in the specimen to which particular reference is had above), but actually darker and 

 brighter than the surrounding integument. The chromatophores are excessively small and copiously 

 distributed. 



Measurements of Polypus ornatus. 



Fig. 14. — Poly- 

 pus ornatus 

 [179], outline 

 drawing of fun- 

 nel laid open 

 medioventrally 

 to expose the 

 funnel organ, 

 natural size. 



Number in author's register . 



Sex. 



Total length 



Tip of body to dorsal base of umbrella 



Length of body (dorsal) 



Width of body 



Width of neck 



Width of head 



Length of — 



Right dorsal arm 



Lelt dorsal arm 



Right second arm 



Left second arm 



Right third arm 



Left third arm 



Right ventral arm 



Left ventral arm 



Umbrella between dorsal arni^ 



Umbrella bet ween ventral arm,. . . 



Hectocotylus 



Diameter of largest sucker 



Length of funnel 



Width of mantle opening 



mm. 

 263 

 38 

 24 



25 



17 

 19 



224 

 225 

 175 

 1S6 

 112 

 IS5 

 126 

 132 



3 



17 

 IS 



