CEPHALOPODA OP THE HAWAIIAN ISLANDS. 
331 
at the tips of all the arms, as in Abralia, except the ventral pair which bear only hooks; extremities of 
ventral arms with a conspicuous series of heavily pigmented black bead-like organs probably photogenic 
in function. Left ventral arm hectocotylized, but distinguished chiefly by its very wide web with 
broad lappets at the margin; no glandular swellings. Two rows of suckers on proximal portion of tentacle 
club suppressed in adult, leaving either two rows of hooks or one row of hooks and one row of suckers, 
which give way distally to four rows of suckers. Buccal membrane deep violet in color. Photogenic 
organs of the mantle usually showing a definite bilateral arrangement; three rows of these organs present 
on the lower aspects of the ventral arms, two occurring on the arm itself, the other upon its marginal 
web. A single series of five large photophores occurs upon the ventral periphery of the eyeball, the 
terminal organs of this series being somewhat larger than the remainder. 
Type. — Enoploteuihis Hoylei Pfeffer 1884 (designation); described from the Mascarene Islands. 
Fins relatively enormous, 
Abraliopsis species (young). 
Abraliopsis species Berry 1909, p. 419 (mere locality record). 
Animal small. Mantle short, acutely conical, widely flaring in front, 
over two-thirds the length of the mantle and notably wider when 
taken together than the latter is long, anterior lobes prominent and 
angular. 
Head small; only broader than long because of the large conspic- 
uous eyes. Funnel flattened, little projecting. 
Arms rather long, very slender and attenuate ; decidedly unequal , 
their formula 4, 2, 3, i; the ventral arms conspicuously longer than 
the others, the dorsal pair notably the shortest. Armature consisting 
of two alternating series of small elevated hooks, the latter persist- 
ent nearly to the tips of the arms, so that the usual suckers at the 
extremities are very small and obscure and have not in the present 
case been actually observed by me. 
Buccal membrane eight-pointed; its coloration violet through- 
out except for the paler and more whitish trabeculae. 
Photogenic organs of mantle conspicuous and exhibiting a very 
definite grouping, not even the smaller ones being very irregularly 
scattered; on the ventral surface of the mantle occur six very definite 
rather distant converging series, with traces of another row as repre- 
sented by three or four widely spaced organs lateral to these. On the 
head three conspicuous rows (the only ones shown in the figure) with 
another weaker row lateral to these and a rather weak circle around 
the eyelid opening, making seven rows in all. Along the ventral 
aspect of the ventral arms there are two rows and one row on the 
third pair. 
The ventral arms bear at their extremities a bead-like series of 
three distinctly separate smooth black ovoid swellings, the median one notably the largest. 
The subocular organs are yellowish in color but too badly damaged to be made out very clearly 
Color in alcohol a brownish buff; the chromatophores darker but comparatively few in number 
Photophores bluish with paler centers. 
Fig. 34. — Abraliopsis sp., young, ventral 
view [276), X 2. Drawn by R. L. 
Hudson. The representation of the 
photogenic organs is incomplete. 
Measurements of Abraliopsis species (young). 
mm. 
Total length exclusive of tentacles 35 
Length of mantle, dorsal 16 
Extreme length of fins 1 1 
Length of fins at base 9 
Width across fins 19 
Width of mantle near anterior margin 7 
Width of head 6 
mm. 
Length of — 
Head 5 
Dorsal arm 7 
Second arm 12 
Third arm 1 1 
Ventralarm 15 
Funnel 5 
