202 Mr. C, T. Regan— .-1 Synopsis of the 



3. E?itosphenus japonicus. 



Petromyzon japonicus, Martens, Arch, f. Nat. xxxiv. 1858, p. 3 ; Giinth. 



Cat. Fish. viii. p. 504 (1870). 

 Lamjwtra japonica, Jord. & Snvd. Proc. U.S. Nat. Mus. xxiii. 1901, 



p. 733. 



Japan; Russia. 



Two Lampreys from Archangel, noticed by Smitt, with a 

 figure of the dentition (Scand. Fish. p. 1191_, fig. 353, 1895), 

 have been kindly sent to me for examination by Prof. E. 

 Loiinberg, and are in every way similar to Japanese examples 

 of E. japonicus. 



4. Entosphenus wilderi. 



Petromyzon branchialis (non Linn.), Gage, Wilder Quarter Century 



Book, p. 436, pi, iv. and pi. vi. fig. 21 (1893). 

 Lampetra wilderi, Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 1896, 



p. 13. 



Eastern North America. 



1. 150 mm. New York. Prof. Bashford Dean. 



2. 160 mm. Waukegan, Illinois. Smithsonian Inst. 

 3-8, 120-160 mm. Cedar Ptapids, Iowa. Field Mus, 



8. Lampetra. 



Petromyzon (part.), Linn. Syst. Nat, ed. 10, p, 230 (1758) ; Giinth, 



Cat. Fish. viii. p. 500 (1870). 

 Lampetra, Gray, Chondi'opt. p, 143 (1851). 



Differs from Entosphenus only in the absence of tlie 

 posterior series of teeth which connect the last pair of en- 

 larged lateral teetli in that genus. 



Europe; Northern Asia ; North America. 



1. Lampetra JluvlatiUs, 



Petromyzon Jluviat His, Linn. Syst. Nat. ed. 10, p. 230 (1758) ; Giinth. 



Cat. Fish. viii. p. 502 (1870) ; Day, Fish. Brit. ii. p. 359, pi. clxxix, 



fig. 1 (1884). 

 Lampetra Jluviatilis, Gray, Chondropt. p. 143 (1851), or Proc. Zool. 



Soc. 1851, p, 237, pi. iv. fig. 2 ; Berg, Bull, Acad. Imp. St. Petersb. 



(5) xxiv. 1906, p. 181. 

 Petromyzon jilumbeus (non Shaw), Ayres, Proc. Calif. Acad. 1854, 



p. 28. 

 Petromyzon ayresii, Giinth. t. c. p. 505. 

 Petromyzon erndi, Dybowski, Verhandl. zool. -hot. Gesellsch. Wien, 



xxii. 1872, p. 220, 



