CEPHALOPODA OF THE HAWAIIAN ISLANDS. 

 Measurements of Polypus /?. 



301 



Author's register 



Total length 



Tip of body to base of dorsal arms 



Length of body (dorsal) 



Width of body 



Width of neck 



Width of head 



Length of— 



Right dorsal arm 



Left dorsal arm 



Right second arm 



mm. 

 19 



28 

 28 



Author's register 



Length of — 



Left second arm 



Right third arm 



Left third arm 



Right ventral arm 



Left ventral arm 



Umbrella between dorsal arms. . 



Umbrella between ventral arms. 



Diameter of largest suckers 



Diameter of mantle opening 



Length of funnel 



29 

 3' 



3' 



31 



S 



10 



1-5 

 10. 5 



196 



1 + 

 9 



13 



14 

 14 

 14 

 14 



Material examined. — Specimens exhibiting essential accord with the above description were very 

 commonly taken by the Albatross in surface hauls. In all some 15 individuals are to be recorded. 



Specimens op Polypus /j Examined. 



Remarks. — The series of small Polypi now under discussion has been the occasion for no little per- 

 plexity, especially since it seemed natural to suppose that a species of such apparent abundance ought 

 to be represented in a collection of this size by adults as well , even though I have been utterly unable to 

 bring about such an identification. The more salient characters which separate these specimens, even at a 

 glance, from the other juveniles before me, are the comparative shortness and equality of the arms, the 

 great development of the umbrella, faint papulation, and the prominent chevronlike chromatophores 

 on the arms. It might be safe to propose a new specific name for this form, but in view of the lack of 

 adult material and the unfortunate uncertainty which attaches to P. hawaiietisis, it seems the part of 

 wisdom to refrain from adding another name to this already overburdened genus. 



Polypus j- (young). 



Polypus r Berry 1909, p. 418 (merely listed). 



Several specimens have a different aspect from anything thus far dealt with. The largest of these 

 is the best preserved and may be briefly described as follows: 



Body bag-shaped, rather elongate, widest near the middle, without any very prominent ventral 

 groove; length exceeding the width by about one-half. Surface densely papillose above, but nearly 

 smooth below; the papillae extend thickly over the dorsal aspect of the mantle, head, and umbrella as 

 well as the outer surface of the first two pairs of arms and the dorsal half of the outer surface of the third ; 

 thev are nearly equal in size, but on the body become longitudinally elongate and appear to be ranked 

 in more or less irregular longitudinal rows, some of them occasionally tending to coalesce to form short 

 17311°— 14 4 



