﻿520 
  

  

  ACTINOPTERYGII. 
  

  

  

  The 
  following 
  specimens 
  of 
  Aethalion 
  are 
  not 
  specifically 
  deter- 
  

   mined 
  : 
  — 
  

  

  P. 
  3656. 
  A 
  nearly 
  complete, 
  deeply 
  fusiform 
  fish, 
  labelled 
  " 
  Pachi- 
  

   cormus 
  latus" 
  by 
  Minister 
  ; 
  Lithographic 
  Stone, 
  Kelheim. 
  

   The 
  specimen 
  wants 
  the 
  extremity 
  of 
  the 
  snout, 
  but 
  must 
  

   have 
  originally 
  measured 
  about 
  0-175 
  in 
  length, 
  whiJe 
  

   the 
  maximum 
  depth 
  of 
  the 
  trunk 
  is 
  0-04. 
  About 
  50 
  

   vertebral 
  centra 
  can 
  be 
  counted. 
  The 
  dorsal 
  fin 
  shows 
  

   16, 
  and 
  the 
  anal 
  fin 
  10 
  rays, 
  the 
  foremost 
  support 
  of 
  the 
  

   dorsal 
  being 
  slightly 
  fan-shaped 
  and 
  apparently 
  composed 
  

   of 
  two 
  rods 
  meeting 
  at 
  an 
  acute 
  angle, 
  with 
  an 
  intervening 
  

   wing 
  of 
  bone. 
  The 
  pelvic 
  fins 
  arise 
  opposite 
  the 
  anterior 
  

   end 
  of 
  the 
  dorsal, 
  while 
  the 
  origin 
  of 
  the 
  anal 
  is 
  midway 
  

   between 
  the 
  former 
  and 
  the 
  caudal. 
  Intermuscular 
  bones 
  

   are 
  conspicuous 
  both 
  above 
  and 
  below 
  the 
  vertebral 
  

   column 
  as 
  far 
  as 
  the 
  middle 
  of 
  the 
  caudal 
  region. 
  

  

  EnnisJcillen 
  Coll. 
  

  

  P. 
  3723. 
  Hinder 
  abdominal 
  and 
  caudal 
  region 
  of 
  a 
  similar 
  fish 
  ; 
  

   Kelheim. 
  The 
  supports 
  of 
  the 
  dorsal 
  fin 
  exhibit 
  small 
  

   wing-like 
  expansions. 
  EnnisJcillen 
  Coll. 
  

  

  P. 
  3728. 
  Nearly 
  complete 
  fish 
  0-105 
  in 
  length, 
  of 
  similar 
  propor- 
  

   tions 
  but 
  fractured 
  across 
  the 
  middle 
  ; 
  Kelheim. 
  The 
  

   axial 
  skeleton 
  and 
  median 
  fins 
  are 
  well 
  exhibited. 
  

  

  Ennishillen 
  Coll. 
  

  

  37926. 
  More 
  slender 
  fish 
  0-13 
  in 
  length, 
  resembling 
  A. 
  Jcnorri, 
  but 
  

  

  with 
  more 
  remote 
  pelvic 
  fins 
  ; 
  Solenhofen. 
  

  

  Haherlein 
  Coll. 
  

  

  37927. 
  Slender 
  fish 
  about 
  0-105 
  in 
  length, 
  with 
  similarly 
  remote 
  

  

  fins 
  ; 
  Solenhofen. 
  Haherlein 
  Coll. 
  

  

  37065. 
  Pish 
  0-068 
  in 
  length, 
  in 
  counterpart 
  ; 
  Solenhofen. 
  

  

  Haherlein 
  Coll. 
  

  

  37056. 
  Equally 
  small 
  fish, 
  with 
  remarkably 
  advanced 
  anal 
  fin 
  ; 
  

   Solenhofen. 
  Haherlein 
  Coll. 
  

  

  A 
  fish 
  from 
  the 
  Lithographic 
  Stone 
  (Lower 
  Kimmeridgian), 
  Cirin, 
  

   Ain, 
  Prance, 
  now 
  in 
  the 
  Pakeontological 
  Museum, 
  Munich, 
  closely 
  

   resembles 
  A. 
  angustus, 
  and 
  is 
  provisionally 
  named 
  Aethalion 
  affinis 
  

   by 
  A. 
  Wagner, 
  Gelehrte 
  Anzeig. 
  k. 
  bay. 
  Akad. 
  Wiss. 
  vol. 
  1. 
  (1860), 
  

   p. 
  405, 
  and 
  Abh. 
  k. 
  bay. 
  Akad. 
  Wiss., 
  math.-phys. 
  CI. 
  vol. 
  ix. 
  

   (1863), 
  p. 
  730, 
  footnote. 
  

  

  