308 On (he Pacific Species of Ilippoglossoides. 



3. Ilippoglossoides elassodon robustus (Gill & Town.). 



Ilippoglossoides robxistm, Gill & Townsend, 1897. 



„ ,, Jordau & ]Lvennann, 1898. 



,, „ Jordan it Gilbert, 1899. 



Hippoqlossoides hamiltoni, Jordan & Evermanu, 1898. 

 ■„ „ Jordan & Gilbert, 1899. 



„ „ Sclimidt, 1902, 1904. 



„ „ Jordan & Starks, 1906. 



„ „ Jordan, Tauaka, & Snyder, 1913. 



It is possible, fis I have mentioned above, that more 

 detailed investigations of a larger material may prove that 

 Ilippoglossoides elassodon duhius is merely an age-variation 

 ot" the forma typica. In this case we shall have in the Pacific 

 only one species of Hippoglossoides, with two subspecies 

 differing in geographical distribution, as Ilippoglossoides 

 elassodon rohustus, according to our collections, belongs more 

 to the northern parts of the Okhotsk Sea, while Ilippo- 

 glossoides elassodon elassodon (and H. e. dtibius) is more 

 represented in the southern parts of Okhotsk Sea and in the 

 North Japanese Sea (Tartar Strait). 



Bibliography. 



Beax. 1881. Proc. U.S. Nat. Mus. vol. iv. p. 242. 



CoLLETT. 1878. Videusk. Selsk. Cliristiania Forhaud, no. 14, p. 92. 



Gilbert and Burke. 1910. Bull. Bureau of Fisheries, Washington, 



vol. XXX. no. 754, p. 95. 

 Gill and Towxsend. ]a97. Proc. Biol. Soc. Washington, vol. xi. 



p. 234. 

 GoTTSCHE. 1835, Wiegmann's Archiv f. Nat. vol. ii. p. 104. 

 Jordan and Etekmann. 1898. * Fishes of N . and M. America,' vol. iii. 



p. 2015. 

 Jordan and Gilbert. 1880. Proc. U.S. Nat. Mus. vol. iii. p. 278. 



. 1883. Synopsis Fish. N. Am. p. 826. 



. 1899. ' Fur Seals and Fur-Seal Islands,' pt. iii. p. 488. 



Jordan and Goss. 1889. Ilep. U.S. Fish, and F. Commiss. vol. xiv. 



p. 241. 

 Jordan and Starks. 1906. Proc. U.S. Nat. Mus. vol. xxxi. p. 189. 

 Jordan, Tanaka, and Snyder. 1913. Journ. Coll. Sc. Tokyo Imp. 



Univ. vol. xxxiii. art. i. p. 320. 

 Schmidt. 1902. Isvest. Imp. Russ. Geogr. Soc. vol. xxxviii. p. 521. 



. 1904. * Pisces marium orientalium Imperii Kossici,' p. 225. 



Smitt. 1893. Hist. Scandin. Fishes, vol. i. p. 421. 

 Snyder. 1911. Proc. U.S. Nat. Mus. vol. xl. p. 546. 

 . 1912. Proc. U.S. Nat. Mus. vol. xlii. p. 439. 



