﻿EUGNATHID^l. 
  

  

  309 
  

  

  broad 
  as 
  deep, 
  and 
  its 
  maximum 
  breadth 
  exceeding 
  one-third 
  the 
  

   length 
  of 
  the 
  cranium 
  ; 
  maxillary 
  teeth 
  very 
  slender, 
  those 
  of 
  the 
  

   premaxilla 
  and 
  dentary 
  much 
  stouter 
  and 
  closely 
  arranged. 
  Principal 
  

   flank-scales 
  about 
  as 
  deep 
  as 
  broad 
  ; 
  all 
  the 
  scales 
  of 
  the 
  abdominal 
  

   region 
  very 
  finely 
  serrated, 
  and 
  many 
  also 
  equally 
  finely 
  pectinated. 
  

   Form. 
  6f 
  Log. 
  Lower 
  Kimmeridgian 
  (Lithographic 
  Stone) 
  : 
  Bavaria. 
  

  

  43003. 
  The 
  type 
  specimen, 
  in 
  counterpart 
  ; 
  Solenhofen. 
  Winkler's 
  

   original 
  description 
  and 
  figure 
  are 
  very 
  inadequate 
  arid 
  in 
  

   part 
  incorrect. 
  Some 
  further 
  details 
  may 
  therefore 
  be 
  

   given, 
  illustrated 
  by 
  the 
  accompaning 
  outline-sketch 
  

   (fig. 
  35). 
  The 
  cranial 
  roof 
  is 
  displaced 
  forwards, 
  exhibit- 
  

   ing 
  the 
  thick 
  parietals 
  {pa.) 
  and 
  frontals 
  (//'.), 
  with 
  the 
  

  

  Y\s. 
  35. 
  

  

  Heterolepidotus 
  typicus 
  ; 
  head-bones 
  of 
  type 
  specimen, 
  less 
  than 
  one 
  half 
  

   natural 
  size. 
  

   br., 
  branchiostegal 
  rays 
  ; 
  c.h., 
  ceratohyal 
  ; 
  c.o., 
  circumorbitals 
  ; 
  ep.h., 
  epihyal 
  ; 
  

   fr., 
  frontal; 
  Tim., 
  hyomandibular 
  ; 
  i.op., 
  interoperculutn 
  ; 
  md., 
  mandible 
  ; 
  

   mx., 
  maxilla; 
  op., 
  operculum 
  ; 
  p.cl., 
  postclavicle 
  ; 
  p.op., 
  preoperculum 
  ; 
  

   pa., 
  parietal 
  ; 
  pas., 
  parasphenoid 
  ; 
  pmx., 
  premaxilla 
  ; 
  s.#u\,supramaxilla 
  ; 
  

   fi.o., 
  suborbitals 
  ; 
  s.op., 
  suboperculum 
  ; 
  sq., 
  squamosal; 
  si., 
  supratemporal 
  ; 
  

   sym., 
  symplectic 
  ; 
  v., 
  vomer. 
  

  

  squamosals 
  {sq.), 
  from 
  the 
  inner 
  aspect 
  ; 
  while 
  the 
  base 
  of 
  

   the 
  skull 
  occurs 
  still 
  further 
  forwards, 
  apparently 
  com- 
  

   prising 
  the 
  long 
  and 
  narrow 
  parasphenoid 
  {pas.) 
  with 
  the 
  

   pair 
  of 
  vomerine 
  bones 
  {v.) 
  in 
  front. 
  The 
  two 
  premaxilla? 
  

  

  