﻿380 
  ACTINOPTERTGII. 
  

  

  Genus 
  ASTHENOCORMUS, 
  nomen 
  nov. 
  

  

  Syn. 
  Agassizia, 
  B. 
  Vetter 
  (nan 
  Agassiz, 
  1846, 
  nee 
  Valenciennes, 
  1847), 
  

   Mittheil. 
  k. 
  mineral.-geol. 
  Mus. 
  Dresden, 
  pt. 
  iv. 
  1881, 
  p. 
  97. 
  

  

  Trunk 
  elongate. 
  Head 
  relatively 
  large, 
  and 
  snout 
  not 
  produced 
  ; 
  

   teeth 
  minute 
  and 
  clustered 
  ; 
  gular 
  plate 
  present. 
  Ossifications 
  in 
  

   sheath 
  of 
  notochord 
  rudimentary 
  or 
  absent. 
  Fin-fulcra 
  absent. 
  

   Pectoral 
  fins 
  large 
  and 
  sickle-shaped, 
  the 
  rays 
  only 
  branching 
  and 
  

   articulated 
  at 
  the 
  extreme 
  end 
  ; 
  pelvic 
  fins 
  absent 
  ; 
  dorsal 
  in 
  

   advance 
  of 
  the 
  anal 
  fin 
  ; 
  caudal 
  fin 
  very 
  deeply 
  forked. 
  Scales 
  

   minute, 
  those 
  of 
  the 
  ventral 
  aspect 
  much 
  broader 
  than 
  deep; 
  

   lateral 
  line 
  inconspicuous. 
  

  

  Asthenocormus 
  titanius 
  (Wagner). 
  

  

  1852. 
  Caturus 
  sp., 
  F. 
  A. 
  Quenstedt, 
  Handb. 
  Petrefakt. 
  p. 
  216. 
  

  

  1863. 
  Eugnathus 
  titanius, 
  A. 
  Wagner, 
  Abh. 
  k. 
  bay. 
  Akad. 
  Wiss., 
  

  

  math.-phys. 
  CI. 
  vol. 
  ix. 
  p. 
  670. 
  

   1881. 
  Agassizia 
  titania, 
  B. 
  Vetter, 
  Mittheil. 
  k. 
  mineral.-geol. 
  Mus. 
  

  

  Dresden, 
  pt. 
  iv. 
  p. 
  97, 
  pi. 
  iii. 
  

  

  Type. 
  Nearly 
  complete 
  fish 
  ; 
  Paheontological 
  Museum, 
  Munich. 
  

  

  The 
  type 
  species, 
  attaining 
  a 
  length 
  of 
  nearly 
  2 
  metres. 
  Length 
  

   of 
  head 
  with 
  opercular 
  apparatus 
  about 
  twice 
  as 
  great 
  as 
  the 
  

   maximum 
  depth 
  of 
  the 
  trunk, 
  and 
  contained 
  somewhat 
  less 
  than 
  

   four 
  times 
  in 
  the 
  total 
  length 
  of 
  the 
  fish. 
  External 
  bones 
  unorna- 
  

   mented, 
  exhibiting 
  only 
  their 
  fibrous 
  texture 
  ; 
  teeth 
  smooth, 
  many 
  

   acutely 
  pointed 
  and 
  slightly 
  arched 
  ; 
  operculum 
  broader 
  than 
  deep. 
  

   Dorsal 
  fin 
  arising 
  at 
  about 
  the 
  middle 
  point 
  of 
  the 
  back 
  ; 
  lobes 
  of 
  

   caudal 
  about 
  equal 
  in 
  length 
  to 
  the 
  pectoral 
  fins. 
  Scales 
  all 
  broader 
  

   than 
  deep. 
  

  

  Form. 
  Sf 
  Loc. 
  Lower 
  Kimmeridgian 
  (Lithographic 
  Stone): 
  Bavaria. 
  

  

  Not 
  represented 
  in 
  the 
  Collection. 
  

  

  Genus 
  PACHYCORMUS, 
  Agassiz. 
  

   [Poiss. 
  Foss. 
  vol. 
  ii. 
  pt. 
  i. 
  1833, 
  p. 
  11.] 
  

  

  Syn. 
  (?) 
  Saurostomus, 
  L. 
  Agassiz, 
  ibid. 
  1833, 
  p. 
  14. 
  

  

  Cephenoplosus, 
  H. 
  E. 
  Sauvage, 
  Revue 
  Sci. 
  Nat. 
  vol. 
  ii. 
  1874, 
  

   p. 
  428. 
  

  

  Trunk 
  laterally 
  compressed 
  and 
  irregularly 
  fusiform, 
  relatively 
  

   deep 
  in 
  the 
  abdominal 
  region, 
  very 
  narrow 
  at 
  the 
  extremity 
  of 
  the 
  

   caudal 
  pedicle. 
  Head 
  much 
  less 
  deep 
  than 
  the 
  trunk, 
  the 
  occipital 
  

   region 
  of 
  the 
  cranial 
  roof 
  raised 
  into 
  a 
  large 
  median 
  eminence 
  to 
  

   meet 
  the 
  laterally-compressed 
  dorsal 
  border 
  of 
  the 
  trunk; 
  teeth 
  

   round 
  in 
  section 
  ; 
  suboperculum 
  at 
  least 
  as 
  large 
  as 
  the 
  operculum 
  ; 
  

   gular 
  plate 
  present. 
  Ossifications 
  in 
  sheath 
  of 
  notochord 
  absent 
  or 
  

  

  