CEPHALOPODA OF THE HAWAIIAN ISLANDS. 



317 



adherent. Locking apparatus a slightly curved cartilaginous groove at either side of the base of the 

 funnel with conspicuous ridges to correspond on the inner wall of the mantle considerably posterior 

 to its margin. 



Sessile arms short, connected by a well-developed basal web reaching beyond the middle of the 

 dorsal arms, but diminishing ventrally and entirely absent between the ventral pair; conspicuously 

 unequal, the order of length 3, 4, 2, 1; third 

 pair much the stoutest and longest and with 

 somewhat larger suckers than the remainder, 

 also differing in the possession of a prominent 

 membranous keel bordering their outer mar- 

 gins; ventral arms also keeled in somewhat 

 similarfashion, but less prominently. Suckers 

 in two rows on all the arms, crowded; ex- 

 tremely minute, especially on the dorsal and 

 ventral arms; those of the second arms slightly 

 larger, and those on the third pair distinctly 

 the largest of all, although not very conspicu- 

 ously so (most of the suckers on this pair of 

 arms have been lost through abrasion, so that 

 it can not be determined whether or not any of 

 the more distal ones are subject to enlarge- 

 ment or other special modification ; the stumps 

 of the pedicels, however, are entirely similar 

 to one another i; individual suckers spherical, 

 with small openings and smooth horny rings; 

 pedicels very short. 



Tentacles exceedingly long and slender; 

 tapering; slightly thickened at the base; club 

 but little if any wider than the stalk, velvety 

 in appearance, and under a high power lens 

 seen to be armed with about eight rows (fewer 

 at base) of extremely minute crowded suck- 

 ers, those near the base somewhat the largest, 

 thence gradually and regularly diminishing in 

 size toward the tip. (PI. h, fig. 2.) 



Ink sac large, by no means covered by the 

 photogenic glands, which, though distinct in 

 the present material, appear to be of small 

 size and very anterior position. 



Gladius not observed; probably absent as 

 in 5. leucoptera. 



Color in alcohol for the most part a brown- 

 ish white ; suffused about the eyes, base of the 

 fins, and notably about the ventral shield, 

 with a purplish black; fins unmarked; mantle 

 closely speckled above and below with small brownish chromatophores of two main types, which become 

 rather fewer in number posteriorly and on the sides; those of the one type are paler, larger, more suffused, 

 and more evenly distributed; the others are darker, much smaller, more distinct, and more exclusively 

 confined to certain areas, such as the dorsum and especially the ventral shield, where they are very 

 thickly and evenly distributed; the difference is very apparent, but I am not sure what morphological 

 17311°— 14 5 



Fig. 28. — Stoloteuthis iris, ventral view of type [31], X 4. 

 by R. L. Hudson 



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