﻿Marsipobranchs 
  of 
  the 
  Order 
  Hyperoartii. 
  203 
  

  

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

  

  xlvii. 
  1896, 
  p. 
  13. 
  

   Lampetra 
  cibaria 
  (PGirard, 
  1858), 
  Jord. 
  & 
  Everm. 
  I.e. 
  > 
  

  

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

  

  Moskva, 
  iii. 
  1907, 
  p. 
  18. 
  

  

  Snpvaoral 
  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. 
  

   8-10. 
  280-320 
  mm. 
  

  

  11. 
  290 
  mm. 
  

  

  12. 
  330 
  mm. 
  

  

  13. 
  210 
  mm. 
  

   14-18. 
  220-400 
  mm. 
  

   19-21. 
  150-230 
  mm. 
  

  

  22. 
  130 
  mm. 
  (incompletely 
  

  

  metamorphosed). 
  

  

  23. 
  300 
  mm. 
  

  

  24. 
  210 
  mm. 
  

  

  25. 
  170 
  mm. 
  

  

  England. 
  

   R. 
  Thames. 
  

  

  j> 
  

   Tewkesbury. 
  

  

  Devonshire. 
  

  

  Holland. 
  

  

  Belgium. 
  

  

  Bavaria. 
  

  

  A. 
  Smee, 
  Esq. 
  

   J. 
  Doubleday, 
  Esq. 
  

   Dr. 
  A. 
  Giintber. 
  

   Mus. 
  Leacb. 
  

  

  Prof, 
  van 
  Beneden. 
  

   Prof, 
  von 
  Siebold. 
  

  

  R. 
  Narowa. 
  

   N. 
  America. 
  

   Russian 
  R., 
  California 
  

  

  St. 
  Petersburg 
  Mus. 
  

  

  2. 
  Lampetra 
  pjlaneri. 
  

  

  Petromyzon 
  planeri, 
  Bloch, 
  Fisch. 
  Deutschl. 
  iii. 
  p. 
  47 
  (1782). 
  

   Petromyzon 
  branchiatis 
  (? 
  Linn.), 
  Giinth. 
  Cat. 
  Fish. 
  viii. 
  p. 
  504 
  (1870) 
  ; 
  

  

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

   Lampetra 
  planeri, 
  Gray, 
  Cbondropt. 
  p. 
  144 
  (1851) 
  ; 
  Berg, 
  Bull. 
  Acad. 
  

  

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

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

  

  xix. 
  1869, 
  p. 
  958. 
  

   Lampetra 
  mitsukurii, 
  FJatta, 
  Annot. 
  Zool. 
  Japon. 
  iv. 
  1901, 
  no. 
  l,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 
  adults, 
  4 
  larvae, 
  and 
  

   3 
  intermediate 
  speci- 
  

   mens). 
  

  

  28-29. 
  150-165 
  mm. 
  

  

  Belfast. 
  

  

  Firth 
  of 
  Forth. 
  

  

  Hawksfold, 
  Sussex. 
  

  

  Berlin. 
  

  

  R. 
  Patterson, 
  Esq, 
  

   Dr. 
  Parnell. 
  

   O. 
  Salvin, 
  Esq. 
  

   Berlin 
  Mus. 
  

  

  Tauber, 
  Wiirtemburg. 
  Stuttgart 
  Coll. 
  

  

  