12 University of Michigan 



ztnlderi. We find the range of this form to extend from 

 southern New England and northern New York south to 

 Maryland (specimens in National Museum), and west to Wis- 

 consin and Iowa, in North America. 



Furthermore, we are wholly unable to distinguish from this 

 form, a nominal species, Lampetra niitsukurii^ described by 

 Hatta"- from Japan, and also recorded by him from eastern 

 Siberia (the species will probably be found to occur also in 

 intervening localities). Regan-^^ has erroneously referred mit- 

 sukiirii to the synonymy of Lampetra planeri, despite the fact 

 that Hatta described its generic characters. It is possible, 

 however, that Hatta did include specimens of L. planeri^ which 

 also occurs in Japan, in his material, particularly that of Lam- 

 petra mitsukurii minor. Under this name he redescribed the 

 same form in 1911,'^* without, however, indicating a definite 

 type-locality; this we here designate as Sapparo, Hokkaido. 



9. Lampetra fiuviatilis Linnaeus 

 A race of lampreys inhabiting San Francisco Bay and Puget 

 Sound, and doubtless ascending West Coast streams to spawn, 

 we identify after careful examination with this species. On 

 examples of this race the names Petromyzon plumheiis Ayres^^ 

 and Petromyzon ayresii Gunther^^ have been based. 



Lonnberg^^ and Smitt^* have both claimed that Lampetra 

 fiuviatilis and L. planeri intergrade and are inseparable spe- 

 cifically. While we expect to return to this problem at a later 

 time, and do consider the intergradation as not improbable. 



^^Annot. Zool. Jap., 4, 1901, p. 24. 



'3 Ann. Mag. Nat. Hist., Ser. 8, Vol. 7, 1911, p. 203. 



3*Annot. Zool. Jap., 7, 191 1, p. 268, pi. 9. 



35 Proc. Calif. Acad. Sci., 1854, p. 28. 



36 Cat. Fishes Brit. Mus., 8, 1870, p. 505. 



37 Bih. Sv. Vet-Akad. Handl., 1893, 18, Afd. 4, No. 2, pp. 1-13. 



38 Hist. Scand. Fishes, pt. 2, 1895, p. 1188. 



