NOTES ON OEGOPSID CEPHALOPODS FOUND IN JAPAN. 



IO5 



18. Otnntasfrephes volatilis Sasaki 1915. 

 Local name : Tobi-ika (Sagami Prov.). 



Ommastrephk volatilis, Sasaki 1915, p. 138, pi. iv, figs. 1-6, text-fig. 3. Off Atami, Sagami 

 Bay. 



The principal characters distinguishing it from other species of the 

 genus are as follows : 



Foveola of siphonal groove without longitudinal folds within, but 

 smooth. Ratio of breadth to length of mantle : 16-19 to IO °- Fins taken 

 together distinctly longer than broad, attenuated posteriorly. Horny ring 

 of arm-suckers varying in denticulation in different suckers of each arm; 

 largest sucker of II arm provided with quadrangular supplemental teeth 

 alternating with long sharp ordinary teeth. Horny ring of largest 

 tentacular sucker with sharp teeth only and without any supplemental 

 ones. Hectocotylus distinguished not only by degeneration of suckers and 

 swelling of sucker-bases, but also by thickening and enlargement of the 

 ventral protective membrane as well as by the sculpture of the outer 

 surface consisting of pits and transverse grooves. 



Subfam. Stenoteuthinae Pfeffer 191 2. 



Genus Stenoteuthis Verrill 1880. 

 19. Stenoteuthis bartrami (Lesueur, 1821). 



laoligo bartrami, Lesueur 1821, p. go; pi. ii, fig. ia-f (fide Pfeffer). 



Ommastreplies bartrami, d'Orbigny, in Fér. et d'Orb. 1839, p. 347; Calmars pl. ii; pi xxi, 



fig. 5; Ommastreph.es pl. ii, figs. 11, 12. Gray 1849, p. 62. Steenstrup 1880, p. 



73 ff.; fig. 2, p. 76; fig. 3, p. 81. Jatta 1896, p. 64, pl. x, figs. 1-16; text-figs. 8 



(p. 10), 12 (p. 11), 36 (p. 19), 41 (p. 21). Neapel. 



Stenoteuthis fteropis, Verrill 1880, p. 228, pl. xxvii, figs. 7, 7a; pl. xxvi, figs. 5-9. Bermuda. 

 Verrill 1882, p. 317, pl. vii, fig. 2; pl. xvii, figs. 3-g. 



Stenoteuthis bartrami, Verrill 1880, p. 223. Verrill 1882, p. 322. Pfeffer igoo, p. 180. 



Pfeffer igo8, pp. 97-100, figs. 109-115. Pfeffer 1912, p. 465, pis. xxxv, xxxvi; pl 



xxxix, figs, i, 2. Atlantic Ocean (Holland, Cap. Is!., Brazil, West-Ind., North Sea, 



