308 BULLETIN OF THE BUREAU OF FISHERIES. 



or less acute posteriorly. Left ventral arm of male hectocotylized. Tentacle club with four rows of 

 suckers on the median portion. Horny rings of the suckers usually toothed. Funnel supported dorsally 

 by free muscular bridles; its aperture with a large internal valve. Shell a horny, uncalcified, feather- 

 shaped gladius, comprising a thickened midrib and broad lateral wings. 



Genus SEPIOTEUTHIS de Blainville 1824. 



Sepioleuthis de Blainville 1824 (fide Hoyle). 

 Sepioleuthis d'Orbigny 1845, p. 319. 

 Sepioteutkis 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. — Sepioleuthis sepiacea de Blainville 1824 (fide Hoyle)=S. sepioidea (de Blainville 1S23), a 

 species of the West Indian region. 



Sepioteuthis arctipinnis Gould 1852." (PI. uv, fig. 1.) 



Sepioteutkis arciipinnis Gould 1852, p. 479, fig. 93. 



Sepioleuthis arctipinnis Tryon 1S79, p. 152, pi. 62, fig. 211 (after Gould). 

 Sepioteutkis 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 blunt 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 bounded by 

 rather acute prominent angles. Fins enormous; attached along the 

 mantle for almost its entire length; widest at about the posterior third, 

 thence gradually tapering anteriorly but ending rather abruptly 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 trun- 

 cate, smoothly curved behind, and broadest at the posterior third as 

 indicated. Cartilaginous articulations of head and mantle as usual in 

 Fig. 20.— Sepioleuthis arctipinnis the genus; large and very prominent. 

 [42], homy ring of sueker from Head squarisn> of moderate size. Eyes large and prominent; in 



third arm, camera outline, X 12. . r -. , ■ --.,.-. . ... 



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 ?ny 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. Sessile arms rather short and stout, armed with 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. Mouth large, lip folded and projecting, with two or three minute cupules at each fold. 



" Length 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. loltgrniformi Is, 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.) 



