﻿202 
  Mr. 
  C. 
  T. 
  Regan— 
  J. 
  Synopsis 
  of 
  the 
  

  

  3. 
  Entosjjhenus 
  japonicus. 
  

  

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

  

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

   Lampetra 
  japonica, 
  Jord. 
  & 
  Snyd. 
  Proc. 
  U.S. 
  Nat. 
  Mus. 
  xxiii. 
  190], 
  

  

  p. 
  733. 
  

  

  Japan 
  ; 
  Russia. 
  

  

  Two 
  Lampreys 
  from 
  Archangel, 
  noticed 
  by 
  Smitfc, 
  with 
  a 
  

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

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

   Lonnberg, 
  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 
  ivilderi, 
  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, 
  IlliDois. 
  Smithsonian 
  Inst. 
  

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

  

  8. 
  Lampetra. 
  

  

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

  

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

   Lampetra, 
  Gray, 
  Chondropt. 
  p. 
  143 
  (1851). 
  

  

  Differs 
  from 
  Entosphenus 
  only 
  in 
  the 
  absence 
  of 
  the 
  

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

   larged 
  lateral 
  teeth 
  in 
  that 
  genus. 
  

  

  Europe; 
  Northern 
  Asia 
  ; 
  North 
  America. 
  

  

  1. 
  Lampetra 
  jluviatilis. 
  

  

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

  

  p. 
  28. 
  

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

   Petromyzon 
  ernsti, 
  Dybowski, 
  Verhandl, 
  zool.-bot. 
  Gesellsch. 
  Wien, 
  

  

  xxii. 
  1872, 
  p. 
  220. 
  

  

  