Ko. 2310. NEW CEPHALOPODS FROM THE PACIFIC—SASAKI. 191 



Head wider than the mantle, with full, large eyeballs. Umbrella 

 very narrow, funnel organ composed of a conspicuous horseshoe- 

 shaped dorsal pad and two ovate ventral pads. Funnel cartilage 

 oblong, slightly longer than twice its own breadth. 



Arms long, subequal, the formula being 3>2>1=4; the longest 

 as long as the mantle. Suckers biserial, nearly uniform; aperture cir- 

 cular. Horny ring smooth; papillate area composed of an irreg- 

 ularly radiated narrow margin and about four irregular rows of 

 plates; these have a minute indistinct papilla in the middle. 



Tentacles about three times as long as the mantle-length; their 

 stems a little thinner than the arms. Club cylindrical, slightly ex- 

 panded ; carpus with a narrow web on the dorsal side. Suckers exceed- 

 ingly numerous, very minute, forming oblique rows of 24 each. 



A peculiar papilliform organ of unknown function developed 

 on either side of the rectum. 



Length of mantle 19 mm.; maximum breadth of mantle 16 mm.; 

 length of longest arm 20 mm.; diameter of largest sucker 0.8 mm. 



Tyiye.— Cat. No. 332830 U.S.N.M. 



Family IDIOSEPHDAE Appellof. 



Genus IDIOSEPIUS Steenstrup. 



38. IDIOSEPIUS PYGMAEUS Steenstrup. 



Idiosepius -pygmaeus, Steenstrup, Danske Vid. Selsk. Skrift., ser. 6, vol. 1, 1881, 

 p. 219, pi. 1, figs. 11-22.— Appellof, Cephalopoden von Ternate, 1898, pp. 

 562, 572, pi. 32, figg. 1-5, 7; pi. 33, figs. 11-13, 20, 22; pi. 34, figs. 24, 26, 29, 30.— 

 Sasaki, Ann. Zool. Japon., vol. 8, 1914, p. 599. 



Station Hakodate Bay. One male and female specimen. Cat. 

 No. 332893, U.S.N.M., and Cat. No. 332894, U.S.N.M. 



These specimens agree with Appellof's description more than with 

 Steenstrup's. The hectocotylized arms have each seven suckers, 

 and the tentacles are as thick as the- arms, their distal two-thirds 

 beset with about 42-50 suckers of bi-quadriserial arrangement. 

 Mantle-length 12 mm. in male and 15 mm. in female. 



Family SEPHDAE. 



Genus SEPIA Linnaeus. 



39. SEPIA ESCULENTA Hoyle. 



Sepia esculenta Hoyle, Challenger Cephalopoda, 1886, p. 129, pi. 18, figs. 1-6. — • 

 Appellof, Japanska Cephalopoder, 1886, p. 28, pi. 3, figs. 1-6. — Sasaki. Annot. 

 Zool. Japon. vol. 8, 1914, p. 611. 



Station: Tsuruga, Tango Prov. One male. Cat. No. 332834, 

 U.S.N.M. 



This specimen is a fuU}^ mature male, measuring 153 mm. in mantle 

 length. It agrees well with Hoyle's description and the mid-ventral 



