CEPHALOPODA OP THE HAWAIIAN ISLANDS. 
309 
tered within the bay of the ventral angle.® Funnel very large; broad at the base and tapering bluntly 
to the wide-valved aperture. Funnel organ enormous, comprising a very large deeply bilobate pad 
occupying most of the posterior two-thirds of the dorsal wall of the funnel, and a pair of much shorter 
bean-shaped ventro-lateral pads. 
Fig. 21. — Sepioteutkis arclipinnis [45], hectocotylized portiou of left ventral arm of male, X 3. 
Arms of moderate length, stout, squarish, unequal, the order of length 3, 4, 2, i. 
All the arms are outwardly keeled and have a broad trabeculated marginal membrane 
bordering tlie sucker-bearing area, this membrane reaches its maximum on the central 
portion of the third arms and is least developed on the ventral pair. Both outer margins 
of the ventral arms conspicuously keeled, the dorsal keel developed as a broad thickened 
membrane ensheathing the base of the tentacle. Suckers large, regularly alternating in 
two rows; the homy rings of the largest armed with 25 to 26 stout acute teeth (fig. 20). 
The hectocotylization is as usual in the genus; for about ig pairs the suckers of both 
rows are normal ; at this point on the left ventral arm the cups become suddenly reduced 
(although persisting to about the twenty-second pair) and the pedicels correspondingly 
enlarged; the latter continue as stout conical papillae to the tip of the arm, those of 
the dorsal row being considerably larger than their ventral companions (fig. 21). 
Tentacles of variable length, laterally compressed; both outer and inner faces 
subcarinate at the base, the inner becoming flattened and transversely striate distally; 
on the distal half of the club the outer carina becomes expanded to form a heavy 
fleshy keel. Club large, expanded; its margins bordered by a crenulate membrane 
strengthened by rather flattened and illy-defined transverse trabeculae. Suckers 
crowded, in four rows; largest at about the middle, especially those of the two cen- 
tral rows, diminishing toward either end; distally all the suckers become very minute, 
those of the ventral row becoming the largest, of the dorsal smallest; homy ring of a 
large median sucker armed witli 17 to 19 strongly incmved teetli. 
Buccal membrane 7-lobed, the lobes pointed and bearing a few very minute suckers 
near their tips. 
Gladius lanceolate; with a heavy midrib and distinct submarginal thickenings 
(fig. 22). 
Color of preserved specimens a brownish buff everywhere beneath tlie large slate- 
colored chromatophores. The latter very variable in size; very numerous and much mn togetlier dor- 
sally, fewer and more scattered on the ventral aspect; absent from the ventral surfaces of the fins. 
® My previously published account of this structure in S. lessoniana (1912b, p. 402) is ambiguous and very misleading respect- 
ing the position of the olfactory pore. The pore is not really dorsal in position, but sheltered within the ventral lobe of the crest 
as stated above. 
V 
Fig. 22. — Sepio “ 
teuthis arcii* 
pinnis [45], 
dorsal aspect 
of gladius of 
male from 
Hono lu I u, 
