308 On the Pacific Species of Hippoglossoides. 



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



Hippoglossoides robustus, Gill & TWnsend, 1897. 



„ „ Jordan & Evermann, 1898. 



„ „ Jordan & Gilbert, 1899. 



Hippoglossoides hamiltoni, Jordan & Evermann, 1898. 



„ „ Jordan & Gilbert, 1899. 



„ „ Schmidt, 1902, 1904. 



,, „ Jordan & Starks, 1906. 



„ „ Jordan, Tanaka, & Snyder, 1913. 



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

 detailed investigations of a larger material may prove that 

 Hippoglossoides elassodon dubius is merely an age-variation 

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

 only one species of Hipp>oglossoides, with two subspecies 

 differing in geographical distribution, as Hipjjoglossoides 

 elassodon robustus, according to our collections, belongs more 

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

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

 represented in the southern parts of Okhotsk Sea and in the 

 North Japanese Sea (Tartar Strait). 



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