180 PROCEEDINGS OF THE NATIONAL MUSEUM. ^ol. 57. 



25 mm. long, elongated, nearly straight, devoid of diverticle. Sper- 

 matophores about 90 mm. long, their opaque part 25-28 mm. long, 

 consisting of 110 by 120 coils of sperm cord. 



Total length up to 262 mm. in male, and 290 mm. in female. 



Type locality. — Near Cape Clonard, Korea. 



Type.— C&t. No. 332987o, U.S.N.M. 



20. POLYPUS ALATUS, new species. 



Plate 24, fig. 4. 



Station 4957 (Bungo-suido). One mature male. Cat. No. 332978, 

 U.S.N.M. 



Station, unknown. One immature male. Cat. No. 332979, U.S. 

 N.M. 



Surface quite smooth, somewhat firm to the touch. Body com- 

 pact, broadest posteriorly, bordered with a horizontal ridge along 

 periphery. Mantle-opening narrow, extending less than half around 

 the body. Umbrella well developed, on an average extending for 

 about one-fourth the length of arms, and then continuing along the 

 ventral side almost to the extremity as a broad fleshy contractile web. 

 Funnel slender, well defmed. Funnel organ small, W-shaped. 



Arms very unequal, the formula of length being 1 > 2 > 3 > 4 ; the 

 longest about five times the length of head and body taken together. 

 Suckers small, low, closely arranged in two well separated rows except- 

 ing several proximal ones v/hich are in a single straight or zigzag row. 



Right third arm hectocotylized, three -fourths as long as the left 

 third, bearing 40-45 pairs of suckers on the normal part. Terminal 

 organ roughly conical, comparatively thick and short, comprising a 

 little less than ^V the entire length of the arm. 



Penis elongated, fusiform., broadest in advance of the middle where 

 it is connected with the duct of the L-shaped Needham's sac. Sper- 

 matophores 48 mm. long, very thin excepting the aboral end \vhich is 

 markedly swollen. 



Gill com.posed of 22 leaflets. Caecum of the stom.ach elliptical in 

 outline, a little involute. 



Measurements of type; total length 440 mm.; ventral length of 

 mantle 55 mm.. ; longest arm 340 nmi. ; hectocotylized arm 190 mm. ; 

 longest radius of umbrella 80 mm. ; diameter of largest sucker 5 mm. 

 Type-locality. — Bungo-suido. 

 Type.—Csii. No. 332978, U.S.N.M. 



21. POLYPUS MACROPUS Sisso. 



Octopus macropus Hoyle, Challenger Cephalopoda, 1886, pp. 11, 95.— Ortmann, 

 Japanisclie Cephalopoden, 1888, p. 643, pi. 21, fig. 3. — Joubin, Bull. Soc. 

 Zool. France, vol. 22, 1897, p. 99. 



Octopus cuvieri Appellop, Japanska Cephalopoder, 1886, p. 6, pi. 1, fig. 6. 



Polypus macropus Wulkeh, Doflein Beitr. Naturgesch. Ostasiens, 1910, p. 8.— 

 Berry, Japanisclie Cephalopoda, 1912, p. 389. 



