1912.] NATURAL SCIENCES OF PHILADELPHIA. 433 



of the Japanese fauna. Assuming the correctness of the recent 

 careful synopsis of the genus given by Chun (1910), the various 

 references to it in the literature cited have certainly been based upon 

 misidentifications. 



Distribution. — Sagami Bay (Chun); 345 fathoms, off Ino Sima 

 Island (Hoyle); China Sea (type locality, Owen). 



Family ARCHITEUTHID^ Pfeffer, 1900. 



Genus ARCHITEUTHUS Steenstrup, 1856. 

 Architeuthus martensii (Hilgendorf, 1880) Steenstrup, 1882. 



Megateuthis Martensii Hilgendorf, 1S80, p. 65. 



Architeuthus Martensii Steenstrup, 1882, p. 157 [15]. 



Architcuthis, sp. Mitsukuri and Ikeda, 1895, pp. 39-50, 1 pi. (fide Hoyle). 



Distribution. — Japan (Hilgendorf) . 



Family OMMASTRBPHID^ Gill, 1871. 



Genus OMMASTREPHES d'Orbigny, 1835. 



Ommastrephes sloanii Gray, 1849. PI. VI, fig. 4. 



Ommastrephes Sloanii Gray, 1849, p. 61. 



Ommastrephes Sloanii Tryon, 1S79, p. 180 (after Gray). 



Todarodes pacificus Steenstrup, 1880, pp. 83, 90, etc. (fide Hoyle). 



(?) Sloanei Steenstrup, 1880, p. 98. 



Ommastrephes sloanei Verrill, 1881, p. 386 (brief note). 



Ommastrephes pacificus Appellof, 1886, p. 35, pi. 3, figs. 8-10. 



Todarodes pacificus Hoyle, 1886, pp. 34, 163, 219, pi. 28, figs. 1-5. 



Todarodes pacificus Ortmann, 1888, pp. 664, 6135 (merely listed). 



? Ommastrephes gouldi M'Coy, 1SSS. 



? Ommastrephes gouldi Brazier, 1892, p. 17 (locality record). 



Todarodes pacificus Joubin, 1897a, p. 103. 



not ? Ommastrephes sloanei Schauinsland, 1899, p. 92 (mere note). 



Ommatostrephes sagittatus sloanei Pfeffer, 1900, p. 179. 



[Pfeffer also unites with this species the O. insignis of Gould, 1852, 

 ascribed to the Fiji Islands and the Antarctic region.] 



Body elongate, cylindric, tapering posteriorly to a sharp point 

 between the fins. Mantle margin entire above and but little emar- 

 ginate below. Fins broadly sagittate, in the adult a little more 

 than two-fifths as long as the mantle. . Mantle connectives as usual 

 in the group. 



Head rather small, squarish, but much compressed, considerably 

 narrower than the widest expansion of the body; bounded pos- 

 teriorly by a transverse thickened ridge, continuous with the three 

 oblique ear-like folds behind each eye. Eyes large, the wide lid 

 openings with a narrow incision or sinus in front. Funnel groove 

 with a distinct foveola in its anterior portion, comprising a horseshoe- 



