CEPHAI.OPODA OF THE HAWAIIAN ISLANDS. 339 
singly, together broadly sagittate; posterior outlines nearly straight, anterior ones arcuate and lobed 
at the inner margin; total length a little less than two-fifths that of the mantle. 
Head large, a little broader than the body; flattened above and below; bounded posteriorly by 
raised thickened fleshy ridge, which is continuous with the three ear-like folds behind the eye composing 
the so-called olfactory crest. Eyes large, the large lid apertures 
with a small indented sinus in front. 
Arms moderate, stout, squarish, little attenuate, their aver- 
age length about half that of the mantle; order of length in 
general 2, 3, i, 4, or in younger specimens 2, 3, i==4; not 
webbed at the base, but all strongly keeled along the outer 
angle, and with a narrow trabeculated membrane bordering the 
margins of the sucker-bearing area; the latter attaining its max- 
imum along the ventral margins of the third arms, but scarcely 
developed on the ventral pair. Suckers large, distant; regu- 
larly alternating in two series so closely appressed together that 
they have rather the appearance of a single zigzag row; those 
of the dorsal arms distinctly smaller than the others ; those of 
the lateral pairs largest, some of those near the middle of the 
arm attaining a diameter 
almost as great as that of 
the arm itself ; on the arms 
of the second pair only 
about 36 to 40 suckers in 
all can be readily counted. 
Homy rings of the larger 
suckers with 19 to 2 1 teeth, 
the upper median tooth 
conspicuously the largest 
and more regularly conical 
in shape than the others; 
those of the lower margin 
blunt and much reduced 
(obsolete in the smaller 
suckers), the remainder acutely pointed; an occasional very 
minute denticle may be interpolated among the teeth of the 
upper margin. 
Tentacles stout, of moderate length, some two-thirds or 
more as long as the mantle; outer margin carinate; club 
slightly expanded, large, the sucker bearing area including 64 
to 70 per cent of the total length of the tentacle. Suckers in 
four rows; all of small size at the extremity, the ventral row 
largest, thence very regularly decreasing in size dorsally ; at the 
middle of the club the dorsal and ventral series about equal, 
but still very small and widely spaced, the suckers of the 
two median rows immensely larger (and therefore more 
crowded) and basin shaped, but proximally again showing 
a diminution in size; at the base of the club the central rows 
terminate, the marginal series continuing past them for a short 
distance down the stalk. The homy rings of the large median suckers are toothed all round, the 
13 to 16 acutely-pointed curved teeth occurring in regular alternation with an equal number of wide, low, 
very thin arcuate plates; upper median tooth much larger and more pointed than the others, very much 
as already noted in the case of the suckers of the sessile arms. The small marginal suckers are much 
Fig. 39. — Ommastrephes hawaiiensis [242) 
outline drawing of funnel organ, nat- 
ural size. 
Fig. 38. — Ommastrephes hawaiiensis, ventral 
view of type [243]. X H- Drawn by R. D. 
Hudson. 
