﻿CATALOGUE 
  OF 
  THE 
  FISHES 
  OF 
  NORTH 
  AMERICA. 
  

  

  Class 
  L— 
  LEPTOCARD1L 
  (I) 
  

  

  Order 
  A.— 
  CIRROSTOMI. 
  (A) 
  

  

  Family 
  I.— 
  BKANCHIOSTOMID^F. 
  (!) 
  

  

  1.— 
  BRANCHIOSTOMA 
  Costa. 
  (1) 
  

  

  1. 
  Braiichiostoma 
  lanceolatum 
  Pallas. 
  E. 
  S. 
  C. 
  P. 
  (1) 
  

  

  Class 
  IL— 
  MARSIPOBRANCHIL 
  (II) 
  

  

  Order 
  B.— 
  HYPEROTRETA. 
  (B) 
  

  

  Family 
  IL— 
  MYXINIDJE. 
  (2) 
  

  

  2.— 
  MYXINE 
  Linnaeus. 
  (2) 
  

  

  2. 
  Myxine 
  glutinosa 
  Linnaeus. 
  B. 
  Eu. 
  (2) 
  

  

  Family 
  III.— 
  BDELLOSTGMID^E. 
  

   3.— 
  POLISTOTREMA 
  Gill. 
  (3)' 
  

  

  3. 
  Polistotrema 
  dombeyi 
  Miiller. 
  C. 
  (3) 
  

  

  Order 
  C— 
  HYPEROTRETA. 
  (G) 
  

  

  Family 
  IV.— 
  PETROMYZONTID2E. 
  (3) 
  

  

  4.— 
  AMMOCGBTES 
  Dumenl. 
  1 
  (3ft.) 
  (4,5) 
  

  

  § 
  Enfosjjhenus 
  Gill. 
  (3&.) 
  (4,5,6) 
  

  

  4. 
  Ammoccetes 
  tridentatus 
  Gairdner. 
  C. 
  Ana. 
  (4) 
  

  

  1 
  For 
  discussions 
  of 
  the 
  genera 
  of 
  PelromyzonUdce 
  see 
  Gill 
  (Proc. 
  U. 
  S. 
  Nat. 
  Mus., 
  

   1882, 
  552) 
  and 
  Jordan 
  & 
  Gilbert 
  (ibid., 
  1883, 
  208). 
  Our 
  species 
  fall 
  most 
  naturally 
  into 
  

   two 
  groups, 
  which 
  we 
  may 
  call 
  genera. 
  Amviococtes 
  with 
  the 
  discal 
  and 
  peripheral 
  

   teeth 
  differentiated, 
  and 
  the 
  supraoral 
  lamina 
  (maxillary 
  tooth) 
  crescentilbrm, 
  and 
  

   Petromyson 
  having 
  the 
  discal 
  and 
  peripheral 
  teeth 
  in 
  obliquely 
  decurved 
  continuous 
  

   rows, 
  and 
  the 
  supraoral 
  lamina 
  contracted, 
  with 
  2 
  or 
  3 
  converging 
  teeth. 
  In 
  both 
  

   groups 
  are 
  minor 
  modifications, 
  indicative 
  of 
  subgenera, 
  the 
  marine 
  species 
  of 
  each 
  

   (marinus, 
  tridentatus) 
  being 
  stronger, 
  with 
  more 
  specialized 
  dentition 
  than 
  the 
  small 
  

   iluviatile 
  forms. 
  

  

  [3] 
  ™ 
  

  

  