﻿Mars'pobrancJis 
  of 
  the 
  Order 
  Ily 
  per 
  oarlii. 
  201 
  

  

  1-6. 
  Adult, 
  120-220 
  mm. 
  Transylvania. 
  C. 
  G. 
  Danford, 
  Esq., 
  and 
  

  

  (types 
  of 
  the 
  species). 
  J. 
  A. 
  Harvie-Brown, 
  Esq. 
  

  

  7-12. 
  Larvae, 
  95-185 
  mm. 
  „ 
  „ 
  

  

  13. 
  Adult, 
  210 
  mm. 
  R. 
  Setes. 
  C. 
  G. 
  Danford, 
  Esq. 
  

  

  7. 
  Entosphenus. 
  

  

  Entosphenus, 
  Gill, 
  Proc. 
  Ac. 
  Philad. 
  1862, 
  p. 
  331. 
  

  

  Disc 
  without 
  radially 
  arranged 
  series 
  of 
  teeth, 
  but 
  with 
  a 
  

   marginal 
  series 
  of 
  small 
  teeth, 
  an 
  anterior 
  group 
  of 
  teeth, 
  

   3 
  or 
  4 
  enlarged 
  teeth 
  on 
  each 
  side, 
  and 
  a 
  posterior 
  series 
  of 
  

   small 
  teeth, 
  parallel 
  to 
  the 
  marginal 
  series, 
  connecting 
  the 
  

   last 
  pair 
  of 
  enlarged 
  lateral 
  teeth. 
  A 
  single 
  broad 
  bicuspid 
  

   or 
  tricuspid 
  supraoral 
  lamina 
  ; 
  infraoral 
  lamina 
  cuspidate. 
  

   Anterior 
  lingual 
  lamina 
  with 
  a 
  single 
  transverse 
  denticulated 
  

   ridge. 
  Dorsal 
  fins 
  separate 
  or 
  subcontinuous. 
  

  

  Europe 
  ; 
  North 
  America 
  ; 
  Japan. 
  

  

  Synopsis 
  of 
  the 
  Species. 
  

  

  1. 
  Supraoral 
  lamina 
  tricuspid 
  ; 
  infraoral 
  lamina 
  with 
  

   5 
  or 
  6 
  cusps 
  ; 
  on 
  each 
  side 
  4 
  enlarged 
  lateral 
  

   teeth, 
  the 
  first 
  and 
  last 
  bicuspid, 
  the 
  middle 
  ones 
  

   tricuspid 
  1. 
  tridentatus. 
  

  

  II. 
  Supraoral 
  lamina 
  bicuspid 
  ; 
  infraoral 
  lamina 
  with 
  6 
  to 
  9 
  cusps. 
  

  

  A. 
  On 
  each 
  side 
  4 
  enlarged 
  lateral 
  teeth, 
  the 
  first 
  

  

  uni- 
  or 
  bicuspid, 
  the 
  others 
  bicuspid 
  2. 
  spadiceus. 
  

  

  B. 
  On 
  each 
  side 
  3 
  enlarged 
  bicuspid 
  lateral 
  teeth. 
  

  

  Dorsal 
  fins 
  well 
  separated 
  3. 
  japonicus. 
  

  

  Dorsal 
  fins 
  only 
  separated 
  by 
  a 
  notch 
  4. 
  wilderi. 
  

  

  1. 
  Entosphenus 
  tridentatus. 
  

  

  Petromyzon 
  tridentatus, 
  Richards. 
  Faun. 
  Bor.-Am. 
  p. 
  293 
  (1836). 
  

   Ichthyomyzon 
  tridentatus, 
  Giinth. 
  Cat. 
  Fish. 
  viii. 
  p. 
  506 
  (1870). 
  

   Ichthyomyzon 
  astori 
  (Girard, 
  1858), 
  Giinth. 
  L 
  c. 
  

  

  Entosphenus 
  tridentatus, 
  Jord. 
  & 
  Everm. 
  Bull. 
  U.S. 
  Nat. 
  Mus. 
  xlvii. 
  

   1896, 
  p. 
  12. 
  

  

  Pacific 
  Coast 
  of 
  North 
  America, 
  from 
  Unalaska 
  to 
  Cali- 
  

   fornia, 
  entering 
  rivers. 
  

  

  1-2. 
  570-590 
  mm. 
  La 
  Grande, 
  Oregon. 
  Prof. 
  C. 
  H. 
  Eigenmann. 
  

  

  3. 
  480 
  mm. 
  Walla 
  Walla, 
  Columbia 
  R. 
  Smithsonian 
  Inst. 
  

  

  2. 
  Entosphenus 
  spadiceus. 
  

  

  Lampetra 
  spadicea, 
  Bean, 
  Proc. 
  U.S. 
  Nat. 
  Mus. 
  1887, 
  p. 
  374 
  ; 
  Jord. 
  & 
  

   Everm. 
  Bull. 
  U.S. 
  Nat. 
  Mus. 
  xlvii. 
  1896, 
  p. 
  13. 
  

  

  Rio 
  Lerma, 
  Mexico. 
  

  

  1. 
  175 
  mm. 
  Jacona, 
  Michoachan. 
  Mexico 
  Mus. 
  

  

  2-5. 
  110-155 
  mm. 
  (larva?). 
  „ 
  „ 
  „ 
  

  

  