Marsipohranchs of the Order Ilyperoartii. 



203 



Lampetra aurea (Bean, 1881), Jord. & Everm. Bull. U.S. Nat, Mu3. 



xlvii. 1896, p. 13. 

 Lampetra cibaria (? Girard, 1858), Jord. & Everm. I. c. 

 ? Lampetra opisthodon, Gratzianow, Dneve. zool. otd. obsc. Hub. jest. 



Moskva, iii. 1907, p. 18. 



Supraoral lamina bicuspid ; infraoral lamina with 6 to 9 

 more or less acutely pointed cusps. On each side 3 enlarged 

 teeth, the first and last usually bicuspid, the middle one 

 usually tricuspid. First dorsal separated from the second by 

 an interspace ; second dorsal triangular. 



Coasts and rivers of Europe, Siberia, Kamchatka, and 

 Western North America, from Alaska to California. 



1-2,3-5,6,7. 150-400 mm. England. 



8-10. 280-320 mm. R.Thames. A. Smee, Esq. 



11. 290 mm. „ J. Doubledav, Esq. 



12. 330 mm. Tewkesbmy. Dr. A. GUnther. 



13. 210 mm. Devonshire. Mus. Leach. 

 14-18. 220-400 mm. Holland. 



19-21. 150-230 mm. Belgium. Prof, van Beneden. 



22. 130 mm. (incompletely Bavaria. Prof, von Siebold. 



metamorphosed). 



23. 300 mm. R. Narowa. St. Petersburg Mus. 



24. 210 mm. 



25. 170 mm. 



R. Narowa. 

 N. America. 

 Russian R., Califoruia, 



2. Lampetra planeri. 



Petromyzon planeiH, Bloeh, Fisch. Deutschl. iii. p. 47 (1782). 

 Petromyzon branchialis {? Linn.), Giintb. Cat. Fish. viii. p. 504 (1870) ; 



Day, Fish. Brit. ii. p. 362, pi. clxxix. tigs. 2-3 (1884). 

 Lampetra planeri, Grav, Chondropt. p. 144 (1851) ; Berg, Bull. Acad. 



Imp. St. Petersburg," (5) xxiv. 1906, p. 181. 

 Petromyzon reissneri, Dybowski, Verhand. zool.-bot. Gesellsch. Wien, 



xix. 1869, p. 958. 

 Lampetra mitsukiirii, Hatta, Annot. Zool. Japon. iv. 1901, no. 1, p. 24 ; 



Jord. & Snyd. Proc. U.S. Nat. Mus. xxiii. 1901, p. 734. 



Supraoral lamina bicuspid, sometimes tricuspid ; infraoral 

 lamina with 6 to 9 obtuse cusps. On each side 3 enlarged 

 teeth, the first and third usually bicuspid, the middle one bi- 

 or tricuspid. First dorsal contiguous to or continuous with 

 the second, separated from it by a notch ; second dorsal with 

 convex free edge. 



Europe; Siberia; Japan. 



1-2. 110-115 mm. 



3-7. 120-140 mm. 



8-17. 110-140 mm. 



18-27. 110-150 mm. 

 (4 adidts, 4 larvae, and 

 3 intermediate speci- 

 mens). 



28-29. 150-165 mm. 



Belfast. 



Firth of Forth. 



Hawksfold, Sussex. 



Berlin. 



Tauber, Wiirtemburg, 



R. Patterson, Esq. 

 Dr. Parnell. 

 O. Salvin, Esq. 

 Berlin Mus. 



Stuttgart Coll. 



