CEPHALOPODA OF THE HAWAIIAN ISLANDS. 



313 



Fig 



are in two rows, at the point where the 4-rowed condition commences the ventral series contains two 



(sometimes apparently only one) modified papillae, usually differentiated from the ordinary sucker 



pedicels, with which they are undoubtedly homologus, by their more slender shape and oblique position. 



Distal to this point occur about 10 quartets of small globular suckers similar to those of the female, 



except that those of the dorsal row are a little the largest. Beyond its basal third the 



arm becomes much swollen, while the suckers of the two ventral rows suddenly give 



place to a compactly crowded, rather irregular series of massive transversely elongate 



and compressed papillae, bearing a mouth-like aperture in place of a true sucker at their 



inner apex, and continuing in constantly diminishing size to the tip. The suckers of 



the two dorsal rows continue normally for two or three pairs farther than the ventral, 



when they too undergo modification , appearing as a crowded alternating double series of 



swollen tubercles, their pedicels not transversely compressed nor so closely palisaded as 



those of the ventral papillae. As in the case of the latter, the suckers themselves are 



reduced to mere lip-like slits at the apices. In all cases these apertures appear to be 



guarded by a highly modified very minutely toothed homy ring. Except in minute 



details, the whole structure is thus seen to offer a close parallel to that which has been 



described for E. morsel. 



The right dorsal arm is more slender than the left and approaches more closely 

 than any of the other arms to the condition observed in the female; all the suckers 

 crowded, minute, but those of the median rows rather the more so; the suckers of the 

 ventral row in their turn slightly smaller than those of the dorsal series. On the arms 

 of the second pair the suckersof the outer rows are larger than those of the inner; about 

 six of the basal suckers of the dorsal row are notably larger than the remaining members 

 of the series; in the ventral row about eight suckers along the distal two-thirdsof the arm 

 are greatly enlarged (though not to such an extent as in E. morsei) and occur in alter- 

 nation with other suckers of the same row having scarcely a third the diameter. The 

 third arms likewise have their marginal suckers larger than the inner, 8 to 10 alternating 

 suckersof the ventral row being much enlarged. The same condition prevails on the ventral arms and is 

 only a little less conspicuous; here three or four suckersof the dorsal series are similarly affected, though 

 in less degree. 



Tentacles very variable in length, elastic, compressed; keeled near the extremity, inner surface 

 flattened. Club little expanded; closely recurved and coiled upon itself at the tip; inner aspect villous 

 in appearance, due to the exceeding minuteness of the numerous suckers. Indi- 

 vidual suckers deeply urceolate, slightly oblique, the so-called papillary area very 

 wide, so that the inner aperture is much reduced; pedicels very long, their basal 

 portions columnar and closely packed together, so that the suckers are mobile only 

 by virtue of a much shorter constricted peduncle, which serves to join the cupules 

 to the main stalk. 



Buccal membrane seven-pointed; thickened, with rugose edges. 

 Gladius, none. 



Color of preserved specimens a pale brownish buff, sometimes spotted above 

 with conspicuous well-defined dark dots, sometimes heavily clouded (especially over 

 the dorsal surface) with dark bluish slate, depending upon the state of expansion 

 or contraction of the chromatophores. There is an especially conspicuous series of 

 large transversely elongate chromatophores ranked in close succession along the 

 outer aspect of each of the sessile arms, and a very similar series of smaller chromatophores extends 

 along the distal portion of the tentacle stalk. The following note as to the color of this species during 

 life appears in Dr. Fisher's handwriting on the reverse of one of the original labels: "Sepia: Chromato- 

 phores brown yellow and sepia eyeballs and visceral sac tinged with iridescent Nile green and blue." 

 Larval or young specimens differ most conspicuously from the adult in their shorter more inflated 

 mantle, larger head, and the fewer and more definite chromatophores. The secondary sexual characters 

 begin to become conspicuous at least as early as the stage with an average mantle length of about 10 mm. 



5. — Euprynf 

 na scolopes: a, 

 sucker from ten- 

 tacle club b 2 jl. 

 from a mount in 

 balsam, greatly 

 enlarged; 6, oral 

 aspect of horny 

 ring from same, 

 same scale. 



FlG. 26 — Eupryjrtna 

 scolopes [323], dia- 

 grammatic repre- 

 sentation of papil- 

 lary area of tentac- 

 ular sucker, greatly 

 enlarged. 



