308 
BUIvIvETIN of the bureau of fisheries. 
or less acute posteriorly. Left ventral arm of male hectocotylized. Tentacle club with fotu* rows of 
suckers on the median portion. Homy rings of the suckers usually toothed. Ftmnel supported dorsally 
by free muscular bridles; its aperture with a large internal valve. Shell a homy, uncalcified, feather- 
shaped gladius, comprising a thickened midrib and broad lateral wings. 
Genus SEPIOTEUTHIS de Blainville 1824 . 
Sepioteuthis de Blainville 1824 {fide Hoyle). 
Sepioteuthis d’Orbigny 184s, p. 319. 
Sepioteuthis Wiilker 1913, p. 460. 
Fins very elongate and marginal, bordering the mantle for nearly or quite its entire length. The 
outline of the entire animal thus becomes elongate-oval, oval, or elliptical. 
Type. — Sepioteuthis sepiacea de Blainville 1824 {fide Ho3de)=S’. sepioidea (de Blainville 1823), a 
species of the West Indian region. 
Sepioteuthis arctipinnis Gould 1852.0 (PI. liv, fig. i.) 
Sepioteuthis arctipinnis Gould 1852, p. 479, fig. 93. 
Sepioteuthis arctipinnis Tryon 1879, p. 132, pi. 62, fig. 211 (after Gould). 
Sepioteuthis arctipinnis Berry 1909, p. 418 (merely listed). 
Sepioteuthis arctipinnis Wiilker 1913, p. 452, 475, 482. 
Adult of moderately large size. Body massive, elongate-conical, compressed dorso-ventrally, 
tapering to a bltmt point behind. Mantle very thick and heavy, its anterior margin free, produced 
forward to a very obtuse and evenly rounded point in the nuchal region ; 
broadly emarginate below the funnel, the emargination botmded by 
rather acute prominent angles. Fins enormous; attached along the 
mantle for almost its entire lengtlr; widest at about the posterior third, 
thence gradually tapering anteriorly but ending rather abmptly just 
before reaching the mantle margin; posteriorly they narrow very rap- 
idly, being not quite continuous around the hinder tip of the body; 
each fin at its widest point about three-fourths as wide as the body at 
the same point; thick at base, but with quite thin margins. Entire 
outline of body, including fins, a very regular ellipse, anteriorly tmn- 
cate, smoothly cmved behind, and broadest at the posterior third as 
indicated. Cartilaginous articulations of head and mantle as usual in 
the genus; large and very prominent. 
Head squarish, of moderate size. Eyes large and prominent; in 
front of the orbit a pore ; behind it the integument is raised into a con- 
spicuous bilobate angled crest, somewhat excavated in front, and with the “olfactory pore” shel- 
o The original description of this species is as follows: 
“Body elongated, ovate lanceolate, tapering gradually backwards to a blunt point. Fins broadest at about the posterior 
fourth, where, together, they equal the width of the body, thence tapering in each direction gradually, and without any angle or 
dilatation. Color dark purple brown above, paler beneath, everywhere finely punctate with dark brown dots. Head narrower 
than the body, longer than broad. Sessilearmsrather short and stout, armed w^ith two rows of cupules; the superior pair shorter 
than the head; the first lateral pair a third longer than the superior, and somewhat longer than the head; the second lateral pair a 
little longer than the first; the inferior pair nearly equal to the second lateral; tentacular arms nearly as long as the body, com- 
pressed, the distal third having a lanceolate dilatation, bearing four rows of delicately pedunculated cupules, armed at the margin 
with delicate black crochets, IMouth large, lip folded and projecting, with two or three minute cupules at each fold. 
“Ten^h of body, six inches; of head, two inches; of superior arms, two and a half inches; of inferior lateral arms, three 
inches;of tentacular arms, eight inches; of cup-bearing portion, two and three-fourths inches; greatest width, two and a half 
inches. 
“From the island of Maui, Sandwich Islands. 
“It closely resembles S.loliginiformist D’Orb., from the Red Sea, which has a much more decided expansion of the fins at its 
posterior half, and the tentacular arms are much shorter. The narrow and regularly tapering fin is its distinguishing character. 
Described from specimens in spirits.” (Gould 1852, p. 479.) 
Fig. 20 . — Sepioteuthis arctipinnis 
(42], homy ring of sucker from 
third arm, camera outline, X 12. 
