338 



BULLETIN OF THE BUREAU OF FISHERIES. 



Specimens of Tracheloteuthis riisei Examined. 



Remarks. — These specimens, all of which are of approximately the same size and developmental 

 stage as the one selected for figuring, are of interest here chiefly because they serve to extend the known 

 range of this curious pelagic species over a much greater area of ocean it was previously reported 

 to inhabit. There is small doubt that it will eventually prove to have an almost universal dispersion 

 in the warmer currents of the ocean. 



Family OMMASTREPHID/E Gill 1871. 



Ommastrephim Steenstrup 1861, (fiide Hoyle). 

 Ommastrephidce Gill 1S71, p. 1. 

 Ommastrephidm Verrill 1881, p. 428. 

 Ommastrephini Hoyle 18S6, p. 32, 162. 

 Ommatosrephidm Pfeffer 1900, p. 153, 176. 

 OmmatoslrephidiE Pfeffer 1908, p. 62, 87. 

 Ommatoslrephidce Pfeffer 1912, p. 369. 



Animal usually of moderate size, but often of considerable dimensions; loliginiform. Fins large, 

 sagittate, subterminal. Suckers in two rows on the arms, usually four rows on the clubs of the tentacles; 

 none of the suckers modified into hooks. Fixing apparatus a single series of modified suckers and pads 

 at the base of the club. Funicular cartilages highly developed , complex ; their major outlines i-shaped. 

 Gladius consisting of little but the rhachis throughout the greater portion of its length; terminating 

 posteriorly in a deep hollow cone. The occurrence of photogenic organs has not been described in any 

 of the genera except Hyaloieuthis. 



Genus OMMASTREPHES d'Orbigny 1835. 



Ommastrcphes d'Orbigny 1835, p. 45. 

 Ommastrephes d'Orbigny 1845, p. 412. 

 Ommatostrephes Loven 1846 (jide Huyle). 

 Ommastrephes (pars) Verrill i88oa-i88i. p. 267. 385. 

 Todarodes Steenstrup 1880, p. 83 (13). 

 Ommatostrephes Pfeffer 1900, p. 178. 179- 

 Ommastrephes Hoyle 1902, p. 198. 

 Ommatostrephes Pfeffer 1908. p. 89. 92. 

 Ommatostrephes Pfeffer 1912, p. 388, 438. 



Funnel groove with a foveola. Horny rings of large tentacular suckers with the teeth either nearly 

 subequal, or with one or more of the apical denticles somewhat enlarged. Fixing apparatus very poorly 

 developed. Sucker bearing portion of tentacle extending for more than half the total length. 



Type. — Loligo sagittate Lamarck 1799 (species first mentioned); a common Atlantic species. 



Ommastrephes hawaiiensis Berry 1912. (PI. uv, fig. 2.) 



? 'Ommastrephes sloanei Schauinsland 1899, p. 92 (listed from Laysan Islaud). 

 Ommastrephes sagittata near sloanei Berry 1909, p. 418 (mere locality records). 

 ^Ommatostrephes SloaJiei Sloanei (pars) Pfeffer 1912, p. 458. 

 Ommastrcphes hawaiiensis Berry igi2b, p 434, 437. 



Animal loliginiform, moderate in size. Mantle cylindro-conical, widest somewhat in advance of 

 the middle, thence tapering very rapidly to an acute point between the fins; margin smooth and entire 

 above, slightly emarginate below the funnel. Fins only moderately large, triangular when taken 



