﻿2 
  ACTINOPTEKYGII. 
  

  

  and 
  anal 
  fins 
  triangular, 
  the 
  origin 
  of 
  the 
  former 
  behind 
  that 
  of 
  the 
  

   latter 
  ; 
  caudal 
  fin 
  forked. 
  Scales 
  large 
  or 
  of 
  moderate 
  size, 
  nearly 
  

   or 
  quite 
  smooth 
  ; 
  dorsal 
  ridge-scales 
  somewhat 
  enlarged. 
  

  

  A 
  description 
  of 
  the 
  known 
  species 
  of 
  Catopterus 
  is 
  given 
  by 
  

   J. 
  S. 
  Newberry 
  in 
  his 
  "Fossil 
  Fishes 
  and 
  Fossil 
  Plants 
  of 
  the 
  

   Triassic 
  Rocks 
  of 
  New 
  Jersey 
  and 
  the 
  Connecticut 
  Valley 
  " 
  (Monogr. 
  

   U.S. 
  Geol. 
  Surv. 
  no. 
  xiv. 
  1888). 
  

  

  Catopterus 
  gracilis, 
  J. 
  H. 
  Redfield. 
  

  

  1837. 
  Catopterus 
  gracilis, 
  J. 
  H. 
  Redfield, 
  Ann. 
  Lyceum 
  Nat. 
  Hist. 
  New 
  

  

  York, 
  vol. 
  iv. 
  pp. 
  37-39 
  (? 
  non 
  pi. 
  i.). 
  

   1841. 
  Catopterus 
  gracilis, 
  W. 
  C. 
  Redfield, 
  Amer. 
  Journ. 
  Sci. 
  vol. 
  xli. 
  

  

  p. 
  27. 
  

   1888. 
  Catopterus 
  gracilis, 
  J. 
  S. 
  Newberry, 
  Foss. 
  Fishes 
  Trias. 
  N. 
  Jersey 
  

  

  and 
  Connecticut 
  (Mon. 
  U.S. 
  Geol. 
  Surv. 
  no. 
  xiv.), 
  p. 
  55, 
  pi. 
  xvi. 
  

  

  figs. 
  1-3. 
  

  

  Type. 
  Nearly 
  complete 
  fishes 
  ; 
  Yale 
  College 
  Museum, 
  New 
  Haven, 
  

   Connecticut, 
  U.S.A. 
  

  

  The 
  type 
  species, 
  attaining 
  a 
  length 
  of 
  about 
  0*25. 
  Length 
  o 
  f 
  

   head 
  with 
  opercular 
  apparatus 
  about 
  equal 
  to 
  the 
  maximum 
  depth 
  

   of 
  the 
  trunk, 
  and 
  contained 
  five 
  times 
  in 
  the 
  total 
  length 
  of 
  the 
  

   fish 
  ; 
  depth 
  of 
  caudal 
  pedicle 
  somewhat 
  less 
  than 
  half 
  that 
  of 
  the 
  

   abdominal 
  region. 
  Cranial 
  bones 
  finely 
  granulated. 
  Pelvic 
  fins 
  

   arising 
  about 
  midway 
  between 
  the 
  pectorals 
  and 
  the 
  anal 
  ; 
  dorsal 
  

   and 
  anal 
  fins 
  nearly 
  equal 
  in 
  size 
  and 
  almost 
  completely 
  opposed. 
  

   Scales 
  smooth, 
  none 
  deeper 
  than 
  broad, 
  those 
  of 
  the 
  flank 
  in 
  the 
  

   abdominal 
  region 
  very 
  finely 
  serrated. 
  

  

  Some 
  small 
  fishes 
  from 
  Boon 
  ton, 
  Middlefield, 
  and 
  Sunderland, 
  

   named 
  Catopterus 
  parvulus 
  (W. 
  C. 
  Redfield, 
  Amer. 
  Journ. 
  Sci. 
  

   vol. 
  xli. 
  1841, 
  p. 
  28, 
  and 
  J. 
  S. 
  Newberry, 
  op. 
  cit. 
  1888, 
  p. 
  60, 
  

   pi. 
  xvi. 
  figs. 
  4, 
  5) 
  are 
  probably 
  to 
  be 
  regarded 
  as 
  the 
  young 
  of 
  this 
  

   species. 
  

  

  Form. 
  <$f 
  Log. 
  Triassic 
  : 
  Connecticut, 
  Massachusetts, 
  and 
  New 
  

   Jersey. 
  

  

  P. 
  7495. 
  Greater 
  portion 
  of 
  abdominal 
  and 
  caudal 
  region, 
  showing 
  

   paired 
  fins 
  ; 
  Boonton, 
  New 
  Jersey. 
  Ward 
  Coll. 
  

  

  P. 
  1038. 
  Imperfect 
  hinder 
  portion 
  of 
  the 
  abdominal 
  region, 
  with 
  

   the 
  caudal 
  region 
  ; 
  Middletown, 
  Westfield, 
  Connecticut. 
  

  

  Egerion 
  Coll. 
  

  

  P. 
  1039. 
  More 
  imperfect 
  specimen 
  of 
  the 
  same 
  ; 
  Durham, 
  Con- 
  

   necticut. 
  Egerion 
  Coll. 
  

  

  P. 
  3515 
  a. 
  Imperfect 
  caudal 
  region 
  ; 
  Durham. 
  Enniskillen 
  Coll. 
  

  

  