﻿200 
  Mr. 
  C. 
  T. 
  Regan 
  — 
  A 
  Synopsis 
  of 
  the 
  

  

  5. 
  Caspiomyzon. 
  

  

  Caspiomyzon, 
  Berg, 
  Bull. 
  Acad. 
  Imp. 
  St. 
  Petersb. 
  (5) 
  xxiv. 
  1906, 
  

  

  p. 
  177. 
  

   Aynathomyzon, 
  Gratzianow, 
  Dneve. 
  zool. 
  otd. 
  obsc. 
  Hub. 
  jest. 
  Moskva, 
  

  

  iii. 
  1907, 
  p. 
  18. 
  

  

  Disc 
  covered 
  with 
  radially 
  arranged 
  teeth. 
  A 
  single 
  

   narrow 
  unicuspid 
  supraoral 
  lamina; 
  infraoral 
  lamina 
  cuspi- 
  

   date. 
  Anterior 
  lingual 
  lamina 
  with 
  a 
  single 
  transverse 
  

   denticulated 
  ridge. 
  Dorsal 
  fins 
  separate. 
  

  

  Caspian 
  Sea 
  and 
  rivers 
  flowing 
  into 
  it. 
  

  

  1. 
  Caspiomyzon 
  wagneri. 
  

  

  Petromyzon 
  wayneri, 
  Kessler, 
  Trud. 
  St. 
  Petersb. 
  Obsbch. 
  Estestv. 
  i. 
  

  

  1870, 
  pp. 
  207, 
  302, 
  pi. 
  iii. 
  figs. 
  4, 
  5. 
  

   Caspiomyzon 
  wayneri, 
  Berg, 
  Bull. 
  Acad. 
  Imp. 
  St. 
  Petersburg, 
  (5) 
  xxiv. 
  

  

  1906, 
  p. 
  178. 
  

   Aynathomyzon 
  wayneri, 
  Gratzianow, 
  Dneve. 
  zool. 
  otd. 
  obsc. 
  Hub. 
  jest. 
  

  

  Moskva, 
  iii. 
  190*7, 
  p. 
  18. 
  

  

  Caspian 
  Sea 
  and 
  the 
  rivers 
  falling 
  into 
  it. 
  

  

  1-3. 
  300-330 
  mm. 
  Astracbau. 
  St. 
  Petersburg 
  Mus. 
  

  

  4. 
  340 
  mm. 
  „ 
  „ 
  

  

  A 
  second 
  species, 
  C. 
  caspicus, 
  has 
  been 
  described 
  (Agna- 
  

   thomyzon 
  caspicus, 
  Gratzianow, 
  Dneve. 
  zool. 
  otd. 
  obsc. 
  Hub. 
  

   jest. 
  Moskva, 
  iii. 
  liJ07, 
  p. 
  IS; 
  Caspiomyzon 
  caspicus, 
  Grat- 
  

   zianow, 
  Trd. 
  otd. 
  icht. 
  obsc. 
  Mofkva, 
  vi. 
  1907, 
  p. 
  18) 
  ; 
  it 
  is 
  

   said 
  to 
  differ 
  from 
  C. 
  wagneri 
  only 
  in 
  the 
  dentition 
  of 
  the 
  

   tongue 
  and 
  is 
  probably 
  a 
  synonym. 
  

  

  6. 
  EUDONTOMYZON, 
  gen. 
  nov. 
  

  

  Disc 
  covered 
  with 
  radially 
  arranged 
  teeth. 
  A 
  single 
  broad 
  

   bicuspid 
  supraoral 
  lamina 
  ; 
  infraoral 
  lamina 
  cuspidate. 
  

   Anterior 
  lingual 
  lamina 
  with 
  a 
  single 
  transverse 
  denticulated 
  

   ridge. 
  Dorsal 
  fins 
  separate. 
  

  

  Transylvania. 
  

  

  1. 
  Eudontomyzon 
  danfordi, 
  sp. 
  n. 
  

  

  Labial 
  teeth 
  numerous, 
  small, 
  pointed 
  ; 
  on 
  each 
  side 
  

   3 
  enlarged 
  teeth, 
  the 
  first 
  and 
  third 
  uni- 
  or 
  bicuspid, 
  the 
  

   middle 
  one 
  bi- 
  or 
  tricuspid. 
  Infraoral 
  lamina 
  with 
  9 
  to 
  11 
  

   cusps. 
  Anterior 
  lingual 
  lamina 
  usually 
  with 
  an 
  enlarged 
  

   median 
  cusp. 
  

  

  Transylvania. 
  

  

  