CEPHALOPODA OF THE HAWAIIAN ISLANDS. 



333 



much more slender, more acutely tapering; hooks entirely lacking; suckers exceedingly minute, occur- 

 ring in two distant narrowly spaced rows of 10 to 14 suckers each, which are confined to the more distal 

 portion of the arm. 



Tentacles short, stout, cylindrical, but little longer than the arms; near the base of the stalk a 

 conspicuous circular constriction, beyond which the stalk swells out again, attaining a diameter even 

 greater than that of the proximal portion, thence tapering gradually to the short blunt unexpanded 

 club. Suckers on inner surface of club minute, in four rows; the five 

 proximal members of the dorsal row distinctly the largest, even exceeding 

 in size the two suckers on the carpus, which together with two small pads 

 constitute the fixing apparatus. (PI. lii, fig. 3.) 



Subocular photophores numerous, at least 14 on each eyeball, but in 

 the present material exceedingly difficult to locate with certainty, due to 

 the ease with which they become detached upon the removal of the outer 

 lid. Most conspicuous are two very large circular organs situated one just 

 behind the other on the ventral periphery of the eyeball, just in front of 

 the funnel (fig. 36, no. 8 and 9). Well anterior to these and more or less in 

 line with them are four very much smaller organs (nos. n-14). Just pos- 

 terior to the lens is a large conical organ (no. 10), while a conspicuous series 

 of seven moderately large organs form an oblique curve in front (nos. 1-7). 

 Of the latter the three upper (nos. 1-3) are very large and conical in outline : 

 the next two and the last one are smaller, but the next to the last one (no. 6) 

 is large flattened, of ovate outline, and pale in color, very different in appearance from any of the other 

 organs. (See also pi. lii, fig. 1.) 



Color in alcohol a grayish buff, the chromatophores somewhat darker. Buccal membrane purplish, 

 with paler trabeculae. The gladius shows through the dorsal integument as a prominent median line. 



Measurements of Pterygioteuthis microlampas. 



Fig. 36. — Pterygioteuthis micrcr 

 lampas, diagram to show ar- 

 rangement of photogenic or- 

 gans of left eyeball [277], X 5. 



Type. — Catalogue No. 214386, United States National Museum [S. S. B. 277]. 



Type locality. — Albatross station 4105, in 314 to 335 fathoms, Kaiwi Channel, bottom of fine coral 

 sand and foraminifera, July 24, 1902; one 9 specimen. 

 Distribution. — Hawaiian Islands (Albatross). 



Specimens op Pterygioteuthis microlampas examined. 



17311° 



> Type. 



