﻿[33] 
  CATALOGUE 
  OF 
  THE 
  FISHES 
  OF 
  NORTH 
  AMERICA. 
  S21 
  

  

  99.— 
  OPSOPCEODUS 
  ' 
  Hay. 
  (105,106) 
  

  

  415. 
  Opsopceodus 
  emilias 
  Hay. 
  Vs. 
  (413,414) 
  

  

  100.— 
  LUXILINUS- 
  Jordan, 
  (gen.nov.). 
  

  

  416. 
  Luxilinus 
  occidentalis 
  Baird 
  & 
  Girard. 
  T. 
  (418) 
  

  

  101.— 
  NOTEMIGONUS 
  Rafinesque. 
  (107) 
  

  

  417. 
  Notemigonus 
  gardoneus 
  Cuv. 
  & 
  Val. 
  Vse. 
  (415) 
  

  

  418. 
  Notemigonus 
  chrysoleucus 
  3 
  Mitchill. 
  Vn. 
  (417) 
  

   418 
  b. 
  Notemigonus 
  chrysoleucus 
  bosci 
  Cuv. 
  & 
  Val. 
  Vse. 
  (419) 
  

  

  102.— 
  RICH 
  ARDSONIUS 
  Girard. 
  (108) 
  

  

  419. 
  Richardsonius 
  balteatus 
  Richardsou. 
  T. 
  (421) 
  

  

  420. 
  Richardsonius 
  lateralis 
  Girard. 
  T. 
  (422) 
  

  

  103 
  — 
  LEPIDOMEDA 
  Cope. 
  (109) 
  

  

  421. 
  Lepidomeda 
  vittata 
  Cope. 
  R. 
  (423) 
  

  

  422. 
  Lepidomeda 
  jarrovii 
  Cope. 
  R. 
  (424) 
  

  

  104.— 
  MEDA 
  4 
  Girard. 
  (110, 
  111) 
  

  

  423. 
  Meda 
  fulgida 
  Girard. 
  R. 
  (425) 
  

  

  424. 
  Meda 
  argentissima 
  Cope. 
  R. 
  (426) 
  

  

  4i. 
  D. 
  1, 
  8; 
  A. 
  1, 
  8. 
  Scales, 
  11-55-5. 
  Teeth, 
  5-5, 
  with 
  well 
  developed 
  grinding 
  sur- 
  

   face. 
  L., 
  3 
  inches. 
  Pyramid 
  Lake, 
  Nevada. 
  (Cope, 
  Proc. 
  Ac. 
  Nat. 
  Sci. 
  Phila., 
  1883, 
  

   146.) 
  

  

  ' 
  The 
  genus 
  Trychero&on 
  should 
  he 
  suppressed, 
  its 
  typical 
  species, 
  T. 
  megalops, 
  heing 
  

   identical 
  with 
  Opsopceodus 
  emilice. 
  

  

  2 
  Luxilinus 
  Jordan. 
  

  

  (Genus 
  nova 
  : 
  typo 
  Ltucilus 
  occidentalis 
  B. 
  and 
  G.) 
  Ventral 
  edge 
  of 
  moderate 
  width 
  ; 
  

   scaled 
  over 
  and 
  not 
  at 
  all 
  carinated; 
  otherwise 
  essentially 
  as 
  in 
  Notemigonus. 
  Gill 
  

   rakers 
  slender, 
  of 
  moderate 
  length. 
  Teeth 
  5-5 
  with 
  entire 
  edges 
  and 
  well 
  developed 
  

   grinding 
  surface, 
  their 
  tips 
  little 
  hooked. 
  Intestines 
  of 
  the 
  short 
  type, 
  hut 
  longer 
  

   than 
  in 
  most 
  related 
  genera. 
  Anal 
  hasis 
  elongate. 
  (Name, 
  a 
  diminutive 
  of 
  Luxilus; 
  

   from 
  lux, 
  light.) 
  

  

  3 
  Specimens 
  from 
  Virginia, 
  South 
  Carolina, 
  Georgia, 
  and 
  Florida 
  (var. 
  bosci) 
  have 
  

   43 
  to 
  50 
  scales 
  in 
  the 
  lateral 
  line, 
  and 
  15 
  to 
  17 
  rays 
  in 
  the 
  anal 
  fin. 
  Specimens 
  from 
  

   various 
  northern 
  and 
  western 
  localities, 
  Nova 
  Scotia 
  to 
  Maryland, 
  Louisiana, 
  and 
  

   Dakota 
  (var. 
  chi'ysoleucus) 
  have 
  46 
  to 
  51 
  scales 
  in 
  the 
  lateral 
  line, 
  and 
  12 
  to 
  14 
  anal 
  

   rays. 
  I 
  regard 
  the 
  two 
  forms 
  as 
  geographical 
  varieties 
  of 
  one 
  species. 
  The 
  name 
  

   Cyprinus 
  americanus 
  is 
  preoccupied, 
  having 
  heen 
  first 
  given 
  to 
  a 
  Menticirrus. 
  

  

  4 
  The 
  types 
  of 
  Meda 
  fulgida, 
  lately 
  found 
  hy 
  me, 
  have 
  the 
  teeth 
  2, 
  5-5, 
  2, 
  not 
  1,4-4, 
  

   1, 
  as 
  slated 
  hy 
  Girard. 
  The 
  genus 
  Meda 
  is 
  therefore 
  identical 
  with 
  Plagopterus. 
  The 
  

   small 
  harhel 
  mentioned 
  hy 
  Cope 
  as 
  a 
  character 
  of 
  Plagopterus, 
  I 
  am 
  unahle 
  to 
  find 
  

   either 
  in 
  Meda 
  or 
  Plagopterus. 
  

  

  Meda 
  fulgida 
  is 
  closely 
  allied 
  to 
  Meda 
  argentissima, 
  hut 
  has 
  the 
  eye 
  a 
  little 
  larger, 
  

   the 
  snout 
  shorter, 
  the 
  lower 
  jaw 
  more 
  prominent. 
  In 
  form, 
  size, 
  coloration, 
  and 
  tin 
  

   rays 
  the 
  two 
  agree 
  fully. 
  

  

  