1911.] NATURAL SCIENCES OF PHILADELPHIA. 555 



Plecoglossus altivelis Schlegel. 



Nine from Morioka, one from Tsuruga and four from Kurume, 

 Japan. 



THYMALLIDJE. 

 Thymallus thymallus (Linnaeus). 



Two from Italy and one from France. 



Thymallus tricolor Cope. 



Proc. Acad. Nat. Sci. Phila., 1865, p. 80. Au Sable River, Michigan. 



No. 7,796, A. N. S. P., type. 



Another from the Au Sable River and a dry skin from Michigan. 



ARGENTINID^E. 

 Mallotus villosus (Miiller). 



Two from Groswater Bay, Labrador; one from Wood's Holl in 

 Mass., and three labeled "North America." 



Thaleichthys pacificus (Richardson). 



One from the Frazer River in British Columbia and another from 

 the Naas River in Oregon. 

 Osmerus eperlanus Linnseus. 



Osmerus sergenti Norris, Proc. Acad. Nat. Sci. Phila., 1868, p. 95. Schuyl- 

 kill River, Philadelphia. 



Nos. 7,751 to 7,753, A. N. S. P., cotypes of 0. sergenti Norris. 



Two examples from France do not differ in any way from American 

 specimens from: Mt. Desert, Me.; Boston, Nahant and Wood's 

 Holl, Mass.; Long Island, N. Y.; Jersey City, the Delaware and 

 Raritan Rivers, N. J. The alleged greater number of scales for the 

 latter, also the supposed shorter gill-rakers and weaker teeth are 

 evidently fallacious. I shall therefore be obliged to follow Smitt 

 in allowing them identical. 



Osmerus thaleichthys Ayres. 



One from Monterey, Cal. 



Mesopus pretiosus (Girard). 



One from Puget Sound. 



Mesopus olidus (Pallas). 



Twenty-eight from Aomori, Japan. Jordan and Snyder state 

 that M. japonicus (Brevoort) differs in having the ventral inserted 

 below the second or third dorsal ray, D. 10 and A. 12 or 13. All 

 of these characters are found in at least some of my examples of the 

 present species, none of which are over 2f inches, and in many cases 

 the afore-mentioned characters are found in combination with those 

 of undoubted examples of M. olidus. 



