﻿SEHIOXOTID.E. 
  

  

  93 
  

  

  pedicles, 
  but 
  obtuse. 
  Fin-fulcra 
  very 
  large, 
  the 
  principal 
  dorsal 
  

   fulcra 
  more 
  than 
  half 
  as 
  long 
  as 
  the 
  anterior 
  dorsal 
  fin-rays 
  ; 
  pelvic 
  

   fins 
  arising 
  much 
  nearer 
  to 
  the 
  anal 
  than 
  to 
  the 
  pectorals 
  ; 
  dorsal 
  

   and 
  anal 
  fins 
  deeper 
  than 
  long. 
  Scales 
  smooth, 
  very 
  few 
  serrated, 
  

   but 
  those 
  of 
  the 
  lateral 
  line 
  and 
  sometimes 
  a 
  few 
  anterior 
  flank- 
  

   scales 
  faintly 
  notched 
  on 
  the 
  hinder 
  margin. 
  

  

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

   and 
  S.E. 
  Erance. 
  

  

  P. 
  470. 
  Type 
  specimen 
  described 
  and 
  figured 
  by 
  Agassiz 
  : 
  Solen- 
  

   hofen. 
  There 
  are 
  some 
  inaccuracies 
  in 
  the 
  description, 
  

   and 
  the 
  original 
  figure 
  is 
  very 
  inadequate. 
  The 
  cranium 
  

   is 
  exposed 
  from 
  the 
  right 
  side, 
  the 
  facial 
  bones 
  being 
  

   destroyed 
  or 
  displaced; 
  and 
  the 
  right 
  operculum 
  is 
  

   observed 
  above 
  the 
  occiput, 
  with 
  two 
  branchiostegal 
  rays, 
  

   displaying 
  the 
  inner 
  aspect. 
  One 
  of 
  the 
  rays 
  partly 
  

   overlaps 
  the 
  operculum, 
  and 
  thus 
  produces 
  the 
  false 
  

   appearance 
  of 
  a 
  downwardly 
  descending 
  process 
  of 
  the 
  

   latter 
  bone 
  in 
  Dinkel's 
  figure. 
  So 
  far 
  as 
  preserved, 
  the 
  

   cranial 
  roof 
  is 
  remarkably 
  smooth, 
  but 
  there 
  are 
  distinct 
  

   traces 
  of 
  a 
  few 
  rounded 
  tuberculations 
  in 
  the 
  parietal 
  

   region 
  ; 
  and 
  at 
  the 
  extremity 
  of 
  the 
  snout 
  there 
  is 
  the 
  

   premaxilla 
  of 
  the 
  right 
  side, 
  with 
  a 
  single 
  series 
  of 
  five 
  

   obtuse 
  teeth 
  and 
  a 
  stout 
  process 
  ascending 
  from 
  its 
  

   internal 
  lateral 
  extremity 
  to 
  the 
  ethmoidal 
  region 
  of 
  the 
  

   cranium. 
  There 
  are 
  ossifications 
  in 
  the 
  otic 
  capsule, 
  and 
  

   the 
  long, 
  slender, 
  apparently 
  toothless 
  parasphenoid 
  meets 
  

   an 
  expanded 
  dentigerous 
  vomer 
  in 
  front. 
  One 
  of 
  the 
  

   hyomandibular 
  elements 
  occurs 
  displaced 
  above 
  the 
  head, 
  

   and 
  is 
  shown 
  to 
  be 
  comparatively 
  slender, 
  with 
  a 
  superior 
  

   expansion 
  and 
  a 
  large 
  posterior 
  process 
  for 
  the 
  support 
  of 
  

   the 
  operculum. 
  The 
  pterygo-palatine 
  arcade 
  of 
  the 
  left 
  

   side 
  is 
  partly 
  seen 
  below 
  the 
  parasphenoid, 
  and 
  that 
  of 
  

   the 
  right 
  side 
  (" 
  maxillaire 
  inferieur 
  gauche 
  " 
  of 
  Agassiz) 
  

   is 
  displaced 
  further 
  beneath 
  and 
  backwards, 
  both 
  exposed 
  

   from 
  the 
  oral 
  aspect 
  ; 
  there 
  are 
  several 
  series 
  of 
  teeth 
  on 
  

   these 
  bones, 
  very 
  large 
  in 
  the 
  front 
  half, 
  but 
  becoming 
  

   comparatively 
  insignificant 
  behind. 
  Immediately 
  in 
  ad- 
  

   vance 
  of 
  the 
  right 
  pterygo-palatine 
  element 
  is 
  the 
  dentary 
  

   bone 
  of 
  the 
  right 
  side, 
  with 
  a 
  single 
  regular 
  series 
  of 
  

   obtuse 
  teeth; 
  and 
  still 
  further 
  forwards 
  are 
  remains 
  of 
  

   other 
  dentigerous 
  bones, 
  regarded 
  by 
  Agassiz 
  as 
  the 
  

   maxillae 
  and 
  premaxillae. 
  Some 
  of 
  the 
  fin-rays 
  and 
  fulcra 
  

   of 
  the 
  pectoral, 
  dorsal, 
  and 
  caudal 
  fins 
  are 
  well 
  shown 
  ; 
  

  

  