CEPHALOPODA OF THE HAWAIIAN ISLANDS. 



319 



Subfamily HETEROTEUTHINjE Appellof 1898. 



HeteroteuihiruE Appellof 1898, p. 624. 

 Heteroteuthinez Joubin 1902, p. xxi. 

 HeterotcuthiiuE Naef 1912, p. 246. 



Mantle margin free all around; a cartilaginous articulation in the nuchal region, but the mantle 

 and body fused farther back. Right dorsal arm hectocotylized. Photogenic glands large and con- 

 spicuous, nearly covering the ventral surface of the ink sac; closely conjoined along the median line. 



Genus HETEROTEUTHIS (Gray 1849). 



Rossia {Heteroteuthis) Gray 1S49, p. 90. 

 Heteroteuthis Steenstrup 1900, p. 287. 

 Stepkanotcuthis Berry 1909, p. 408. 

 Heteroteutkis Naei 1912, p. 246. 



Body plump, compact; obtusely pointed posteriorly. 

 Fins large, more posterior than anterior in position. Ventral 

 mantle margin produced forward beneath the head so as to 

 almost or even entirely conceal the funnel. Arms short, 

 webbed all around except between the ventral pair. Right 

 dorsal arm hectocotylized and united at base with the second 

 arm of the same side; a few suckers on the third arms of the 

 male greatly enlarged. 



Type. — Sepiola dispar Riippell 1844 (monotypic); a spe- 

 cies of the Mediterranean region. 



Heteroteuthis hawaiiensis (Berry 1909) Naef 1912. (PI. l, 

 ng. 3-8-) 



Stephanoteuthis hawaiiensis Berry Igog, p. 409, fig. 2; p. 418. ' iS&*§l?££ •' 



Semirossia (?) sp. Berry igog p. 418 (merely listed). '/;..' 



Heteroteuthis hawaiiensis Naef 1912, p. 246. 

 Heteroteuthis hawaiiensis Berry 1912c, p. 645. 



Female (type specimen): Body short, plump, compact, 

 very firm and solid; dorsal aspect tapering posteriorly and 

 terminating past the fins in an obtuse point; ventral half 

 of body more rounded, scarcely tapering, and abruptly sur- 

 passed above by the pointed dorsal portion, from which it is 

 separated by a short curved horizontal groove, as though the dorsal and ventral halves of the body were 

 slid upon one another beneath the integument like the two divisions of a large bean; dorsum less convex 

 than the venter, which is full and rounded. Mantle margin free all around, sinuous; slightly projecting 

 above, thence sweeping backward, downward, and then far forward again, broadly curving beneath the 

 eyes to form a conspicuous ventral lobe, which, though slightly emarginate in front, entirely conceals both 

 the funnel and the ventral surface of the head. In the nuchal region a little way behind the margin 

 the mantle is united to the body by an indistinct cartilage and a delicate membrane which is easily 

 torn away. Ventral locking apparatus essentially as in other Sepiolids; an elongated groove with a 

 raised and reflexed margin articulates on either side of the base of the funnel with a thickened ridge 

 on the inner surface of the mantle, the ridge bent at its anterior end so as to inclose a small pitlike 

 depression. The very tight adhesion of the ventral lobe of the mantle to the head is secured in two 

 ways: First, by the strong upward flexion and close application of the margin to the ventral surface 

 of the head, and, secondly, by the insertion of this margin into two deep curved grooves extending 

 obliquely along the under surface of the head from a point about midway of the lower eyelid, nearly 

 but not quite to the cleft between the ventral arms; on the eyelid the groove is shallowest, deepest at 

 its inner end, and bounded anteriorly by a heavy raised margin. (PI. L, fig. 7 and 8.) 





Fig. 29. — Heteroteutkis hawaiiensis, dorsal view 

 of type [30I, X i J A. Drawn by R. L.Hudson. 



