﻿432 
  ACTINOPTERYGII. 
  

  

  some 
  extent 
  in 
  advance 
  of 
  the 
  anterior 
  extremity 
  of 
  the 
  mandible 
  ; 
  

   the 
  pointed 
  front 
  end 
  of 
  the 
  dentary 
  bones 
  suturally 
  united 
  with 
  

   a 
  deep 
  re-entering 
  angle 
  in 
  the 
  presymphysial 
  bone 
  ; 
  superficial 
  

   ornament 
  consisting 
  of 
  delicate 
  rugae. 
  Vertebrae 
  in 
  the 
  form 
  of 
  

   separated 
  narrow 
  rings, 
  much 
  deeper 
  than 
  broad. 
  Scales 
  smooth 
  

   or 
  feebly 
  tuberculated 
  and 
  rugose 
  ; 
  those 
  of 
  the 
  lateral 
  line 
  not 
  

   much 
  exceeding 
  in 
  depth 
  the 
  series 
  below. 
  

  

  The 
  vertebral 
  rings 
  in 
  this 
  species 
  evidently 
  differ 
  from 
  those 
  of 
  

   the 
  preceding 
  species 
  merely 
  in 
  the 
  circumstance 
  that 
  they 
  repre- 
  

   sent 
  a 
  lower 
  stage 
  of 
  calcification 
  than 
  the 
  elongated 
  constricted 
  

   rings 
  already 
  described. 
  This 
  is 
  indicated 
  by 
  the 
  considerable 
  

   width 
  of 
  the 
  spaces 
  between 
  the 
  successive 
  rings. 
  

  

  Form. 
  ^ 
  Loc. 
  Lower 
  Kimmeridgian 
  : 
  Bavaria, 
  and 
  (?)Ain, 
  France. 
  

  

  35014. 
  Head 
  and 
  greater 
  part 
  of 
  the 
  trunk 
  with 
  paired 
  fins, 
  the 
  

   head 
  shown 
  of 
  the 
  natural 
  size 
  in 
  PI. 
  XVII. 
  fig. 
  12; 
  

   Lithographic 
  Stone, 
  Solenhofen. 
  The 
  specimen 
  is 
  ex- 
  

   hibited 
  in 
  side 
  view, 
  displaying 
  the 
  shortness 
  of 
  the 
  

   mandible, 
  the 
  suture 
  separating 
  the 
  presymphysial 
  bone 
  

   (ps.) 
  from 
  the 
  dentary 
  (d.), 
  and 
  the 
  proportions 
  of 
  the 
  

   opercular 
  apparatus. 
  The 
  fins 
  are 
  fragmentary, 
  and 
  the 
  

   scales 
  are 
  mostly 
  shown 
  in 
  obscure 
  impressions. 
  

  

  Purchased, 
  1860. 
  

  

  36029. 
  Contorted 
  fish 
  showing 
  the 
  principal 
  specific 
  characters, 
  

   including 
  the 
  incomplete 
  calcification 
  of 
  the 
  notochordal 
  

   sheath 
  in 
  the 
  form 
  of 
  deep 
  and 
  narrow 
  separated 
  rings 
  ; 
  

   Solenhofen. 
  Purchased, 
  1861. 
  

  

  P. 
  962. 
  Imperfect 
  specimen 
  showing 
  the 
  head 
  and 
  greater 
  part 
  of 
  

   the 
  trunk 
  with 
  pectoral 
  fins 
  chiefly 
  in 
  impression 
  ; 
  Solen- 
  

   hofen. 
  Egerton 
  Coll. 
  

  

  P. 
  962 
  a. 
  Detached 
  skull 
  and 
  mandible, 
  much 
  crushed, 
  showing 
  

   the 
  superficial 
  rugose 
  ornament, 
  some 
  of 
  the 
  teeth 
  in 
  the 
  

   lower 
  jaw, 
  and 
  the 
  suture 
  between 
  the 
  dentary 
  and 
  pre- 
  

   symphysial 
  bone 
  ; 
  Solenhofen. 
  Egerton 
  Coll. 
  

  

  P. 
  2001. 
  Two 
  imperfect 
  specimens 
  chiefly 
  in 
  impression, 
  probably 
  

   of 
  this 
  species 
  ; 
  Cirin, 
  Ain, 
  France. 
  The 
  dorsal 
  ridge- 
  

   scales 
  in 
  one 
  specimen 
  are 
  coarsely 
  rugose. 
  Egerton 
  Coll. 
  

  

  The 
  following 
  imperfect 
  specimen 
  appears 
  to 
  exhibit 
  a 
  snout 
  as 
  

   much 
  attenuated 
  as 
  that 
  of 
  Belonostomus 
  tenuirostris, 
  but 
  the 
  fish 
  

   is 
  of 
  larger 
  dimensions 
  than 
  usual 
  in 
  this 
  species 
  and 
  the 
  squamation 
  

   has 
  more 
  nearly 
  the 
  aspect 
  of 
  that 
  of 
  B. 
  muensteri. 
  The 
  specimen 
  

  

  