﻿■0)6 
  Mr, 
  C. 
  T. 
  Regan 
  on 
  the 
  Sijslematic 
  

  

  II. 
  Parietals 
  meeting 
  in 
  the 
  middle 
  line. 
  Teeth 
  on 
  vomer 
  and 
  tongue, 
  

   when 
  present, 
  in 
  several 
  series. 
  Sonles 
  larger, 
  13 
  or 
  less 
  in 
  a 
  

   transverse 
  series 
  from 
  origin 
  of 
  dorsal 
  tin 
  to 
  lateral 
  line. 
  ( 
  Cvrcyo- 
  

   nmce.) 
  

  

  A. 
  Dorsal 
  tin 
  short, 
  with 
  not 
  more 
  than 
  16 
  ra3's 
  ; 
  teeth 
  very 
  small 
  

  

  or 
  absent. 
  

   Teeth 
  very 
  small, 
  but 
  distinct, 
  in 
  bands 
  in 
  

  

  jaws 
  and 
  on 
  palatines, 
  in 
  a 
  patch 
  on 
  

  

  vomer 
  and 
  another 
  on 
  tongue 
  5. 
  Stenodim, 
  Eichards. 
  

  

  Teeth 
  vestigial 
  or 
  absent 
  , 
  . 
  6, 
  Corer/oiius, 
  Linn. 
  

  

  B. 
  Dorsal 
  fin 
  longer, 
  with 
  not 
  less 
  than 
  18 
  rays 
  ; 
  teeth 
  well 
  developed. 
  

  

  Mouth 
  rather 
  large 
  ; 
  teeth 
  strong 
  , 
  . 
  7. 
  Plujl(>(H'j)hyra, 
  Bouleng, 
  

  

  Mouth 
  rather 
  small 
  ; 
  teeth 
  moderate 
  8. 
  I'hyinallns, 
  Cuv. 
  

  

  I'he 
  limits 
  and 
  contents 
  of 
  the 
  four 
  geneia 
  of 
  (lie 
  Sahno- 
  

   ninse 
  are 
  the 
  subject 
  of 
  the 
  following 
  notes 
  : 
  — 
  

  

  1. 
  Salmo, 
  Linn. 
  

  

  This 
  genus 
  includes 
  all 
  the 
  fishes 
  commonly 
  known 
  as 
  

   Salmon 
  and 
  Trout. 
  Examination 
  of 
  the 
  skeletons 
  leaves 
  no 
  

  

  Fig. 
  1. 
  

  

  Skulls 
  of 
  a. 
  Atlantic 
  Trout 
  (-S". 
  tndta) 
  and 
  b. 
  Pacific 
  Trout 
  (*S'. 
  c/ar/xii), 
  

   from 
  fish 
  about 
  9 
  inches 
  long. 
  

  

  cth, 
  mesethmoid 
  ; 
  Icth, 
  lateral 
  ethmoid; 
  r, 
  longitudinal 
  rido-e; 
  

   /, 
  supraorbital 
  flange 
  of 
  frontal 
  bone. 
  

  

  douht 
  that 
  the 
  Pacific 
  species 
  (Steelhead^ 
  llainbow 
  Trout, 
  

   Quinnat 
  Salmon, 
  &e.) 
  foim 
  a 
  perfectly 
  natural 
  group 
  that 
  

   differs 
  in 
  several 
  characters 
  from 
  the 
  Salmon 
  and 
  Trout 
  of 
  

   the 
  Atlantic. 
  The 
  latter 
  are 
  especially 
  distinguished 
  by 
  the 
  

   large 
  size 
  of 
  the 
  mesethmoid 
  bone^ 
  which 
  is 
  not 
  or 
  but 
  

  

  