﻿60 
  ACTTNOPTERYGII. 
  

  

  1877. 
  Ischypterus 
  latus, 
  R. 
  H. 
  Traquair, 
  Quart. 
  Journ. 
  Geol. 
  Soc. 
  

  

  vol. 
  xxxiii. 
  p. 
  559. 
  

   1888. 
  Ischypterus 
  tenuiceps, 
  J. 
  S. 
  Newberry, 
  Foss. 
  Fishes 
  Trias. 
  N. 
  

  

  Jersey 
  and 
  Connecticut 
  (Mon. 
  U.S. 
  Geol. 
  Surv. 
  no. 
  xiv.), 
  p. 
  32, 
  

  

  pi. 
  v. 
  figs. 
  1-3, 
  pi. 
  vii. 
  fig. 
  3. 
  

  

  1888. 
  Ischypterus 
  latus, 
  J, 
  S. 
  Newberry, 
  ibid. 
  p. 
  46, 
  pi. 
  xiii. 
  fig. 
  3. 
  

  

  1889. 
  Allolepidotus 
  americanus, 
  W. 
  Deecke, 
  Palaeontogr. 
  vol. 
  xxxv. 
  

   p. 
  114. 
  

  

  Type. 
  Imperfect 
  fish 
  ; 
  Geological 
  Society 
  of 
  London. 
  

  

  A 
  species 
  attaining 
  a 
  length 
  of 
  about 
  0*2. 
  Trunk 
  with 
  con- 
  

   siderably 
  arched 
  dorsal 
  border, 
  the 
  depth 
  of 
  the 
  caudal 
  pedicle 
  more 
  

   than 
  one-third 
  as 
  great 
  as 
  the 
  maximum 
  depth 
  of 
  the 
  abdominal 
  

   region. 
  Length 
  of 
  head 
  with 
  opercular 
  apparatus 
  less 
  than 
  the 
  

   maximum 
  depth 
  of 
  the 
  trunk, 
  and 
  contained 
  four 
  times 
  in 
  the 
  total 
  

   length 
  of 
  the 
  fish. 
  Fins 
  as 
  in 
  S. 
  fultus. 
  Scales 
  smooth 
  and 
  not 
  

   serrated, 
  those 
  of 
  the 
  middle 
  of 
  the 
  flank 
  in 
  part 
  twice 
  as 
  deep 
  as 
  

   broad; 
  dorsal 
  ridge-scales 
  large 
  and 
  conspicuous, 
  comparatively 
  

   obtuse 
  in 
  large 
  specimens. 
  

  

  Form. 
  Sf 
  Loc. 
  Triassic 
  : 
  Massachusetts, 
  Connecticut, 
  and 
  New 
  

   Jersey. 
  

  

  38548-49. 
  Two 
  small 
  fishes, 
  imperfectly 
  preserved; 
  Sunderland, 
  

   Mass. 
  Purchased, 
  1864. 
  

  

  P. 
  3511 
  b. 
  Specimen 
  about 
  0*18 
  in 
  length 
  ; 
  Massachusetts. 
  

  

  Ennislcillen 
  Coll. 
  

  

  P. 
  1017-8. 
  Four 
  fragmentary 
  specimens, 
  displaying 
  the 
  deepened 
  

   scales 
  on 
  the 
  flank 
  ; 
  Sunderland, 
  Mass. 
  Egerton 
  Coll. 
  

  

  P. 
  7400. 
  Fish 
  0-145 
  in 
  length 
  ; 
  Connecticut. 
  

  

  , 
  Presented 
  by 
  Prof. 
  C. 
  U. 
  Shepard. 
  

  

  38547. 
  Two 
  similar 
  specimens 
  ; 
  Connecticut. 
  Purchased, 
  1864. 
  

  

  28429. 
  Slab 
  with 
  two 
  specimens 
  ; 
  Connecticut. 
  Mantell 
  Coll. 
  

  

  26591. 
  Middle 
  portion 
  of 
  large 
  fish 
  ; 
  Connecticut. 
  

  

  Presented 
  by 
  Dr. 
  J. 
  J. 
  Bigsby, 
  1851. 
  

  

  P. 
  3512. 
  A 
  very 
  large 
  imperfect 
  specimen, 
  doubtfully 
  of 
  this 
  species 
  ; 
  

   Boonton, 
  New 
  Jersey. 
  EnnisTcillen 
  Coll. 
  

  

  Semionotus 
  alsaticus, 
  Deecke. 
  

  

  1889. 
  Semionotus 
  alsaticus, 
  W. 
  Deecke, 
  Palaeontogr. 
  vol. 
  xxxv. 
  p. 
  104, 
  

   pi. 
  vi. 
  fig. 
  1. 
  

  

  Type. 
  Nearly 
  complete 
  fish 
  ; 
  Strassburg 
  Museum."] 
  

  

  