﻿AND 
  AVES 
  OF 
  NORTH 
  AMERICA. 
  23 
  

  

  Pectoral 
  bones 
  with 
  strong 
  elevated 
  radii 
  and 
  very 
  weak 
  reticulation 
  in 
  the 
  centre 
  of 
  

   the 
  median. 
  The 
  abdominal 
  scales 
  thick, 
  many 
  in 
  a 
  transverse 
  series. 
  

  

  C. 
  CRASSISCUTATUS. 
  

  

  Pectoral 
  bones 
  nearly 
  as 
  above 
  ; 
  the 
  abdominal 
  scales 
  slender, 
  not 
  more 
  than 
  three 
  in 
  

   a 
  lateral 
  transverse 
  series. 
  

  

  C. 
  MARSHII. 
  

  

  Pectoral 
  bones 
  — 
  the 
  lateral 
  finely 
  pitted, 
  the 
  pits 
  becoming 
  elongate 
  towards 
  the 
  

  

  margin. 
  

  

  C. 
  FOVEATUS. 
  

  

  COLOSTEUS 
  CRASSISCUTATUS, 
  Cope. 
  

  

  One 
  of 
  the 
  specimens 
  of 
  this 
  species 
  consists 
  of 
  a 
  supero-lateral 
  view 
  of 
  a 
  crushed 
  cranium 
  and 
  anterior 
  part 
  of 
  

   the 
  body. 
  The 
  median 
  pectoral 
  bone 
  appears 
  as 
  a 
  sagittiform 
  plate 
  with 
  thin 
  edges, 
  rounded 
  lateral 
  angles 
  and 
  a 
  

   thin 
  median 
  prolongation 
  behind. 
  The 
  greater 
  part 
  of 
  the 
  borders 
  of 
  the 
  right 
  orbit 
  are 
  distinct, 
  and 
  display 
  the 
  

   continuity 
  of 
  the 
  malar 
  and 
  supratemporal 
  regions. 
  The 
  ramus 
  mandibuli 
  is 
  longer 
  than 
  the 
  cranium 
  proper. 
  The 
  

   number 
  of 
  the 
  teeth 
  cannot 
  be 
  determined, 
  but 
  they 
  are 
  rather 
  large, 
  and 
  traces 
  of 
  their 
  existence 
  do 
  not 
  extend 
  

   behind 
  the 
  orbits. 
  The 
  length 
  of 
  the 
  long 
  anterior 
  mandibular 
  tootli 
  is 
  .5mm., 
  and 
  the 
  diameter 
  at 
  the 
  base 
  ,1mm. 
  

   Diameter 
  of 
  base 
  of 
  a 
  superior 
  maxillary 
  ."2mm. 
  The 
  approximate 
  length 
  of 
  the 
  mandibular 
  ramus 
  is 
  ,0715m. 
  long 
  ; 
  

   longitudinal 
  diameter 
  of 
  the 
  orbit 
  72mm. 
  ; 
  length 
  of 
  median 
  pectoral 
  plate 
  .036m. 
  ; 
  width 
  of 
  same 
  .019m. 
  

  

  Other 
  specimens 
  (Nos. 
  4 
  and 
  10 
  coll. 
  J. 
  S. 
  Newberry) 
  show 
  that 
  the 
  abdominal 
  scutellation 
  commences 
  

   immediately 
  behind 
  the 
  pectoral 
  bones. 
  Those 
  near 
  the 
  median 
  line 
  are 
  similar 
  to 
  the 
  external, 
  and 
  they 
  unite 
  in 
  a 
  

   zigzag 
  line. 
  The 
  depth 
  of 
  these 
  scales 
  is 
  oblique, 
  and 
  is 
  somewhat 
  greater 
  than 
  the 
  width. 
  Thus 
  one 
  angle 
  

   projects, 
  and 
  gives 
  the 
  surface 
  a 
  somewhat 
  ribbed 
  rather 
  than 
  continuous 
  character. 
  The 
  following 
  measurements 
  

   express 
  their 
  dimensions 
  relative 
  to 
  other 
  portions 
  of 
  the 
  body. 
  

  

  M. 
  

  

  Width 
  of 
  median 
  pectoral, 
  .0138 
  

  

  Do. 
  three 
  pectorals 
  restored, 
  .054 
  

  

  Do. 
  scale 
  band, 
  .064 
  

  

  Scales 
  in 
  .01m. 
  transversely 
  to 
  series, 
  5.2 
  

  

  Do. 
  longitudinally 
  do., 
  1.75 
  

  

  Radii 
  of 
  lateral 
  pectoral 
  crossed 
  by 
  .01m., 
  7 
  

  

  Length 
  ulna 
  and 
  radius, 
  .0108 
  

  

  Do. 
  metacarpus, 
  000 
  

  

  The 
  above 
  measurements 
  express 
  the 
  small 
  size 
  and 
  weakness 
  of 
  the 
  fore 
  limb. 
  Another 
  specimen 
  (No. 
  18) 
  in 
  

  

  which 
  the 
  impressions 
  of 
  the 
  scales 
  are 
  of 
  the 
  same 
  size 
  as 
  those 
  of 
  the 
  preceding, 
  the 
  impression 
  of 
  what 
  may 
  be 
  

   femur 
  and 
  ulna 
  and 
  radius 
  are 
  visible, 
  which 
  are 
  of 
  considerably 
  smaller 
  size 
  than 
  the 
  one 
  above 
  mentioned. 
  They 
  

   are 
  but 
  doubtfully 
  these 
  elements. 
  

  

  M. 
  

  

  Length 
  proximal 
  element, 
  ^04 
  

  

  Do. 
  two 
  distal 
  do., 
  0038 
  

  

  A 
  median 
  pectoral 
  plate 
  of 
  a 
  seventh 
  and 
  much 
  larger 
  individual 
  than 
  the 
  preceding 
  is 
  prolonged 
  anteriorly 
  

   and 
  posteriorly. 
  The 
  broad 
  posterior 
  portion 
  is 
  transversely 
  ribbed, 
  the 
  ribs 
  weaker 
  and 
  interrupted 
  medially. 
  

   Length 
  .063m.; 
  with 
  .04m. 
  

  

  This 
  very 
  interesting 
  form 
  is 
  part 
  of 
  the 
  unique 
  and 
  important 
  collection 
  made 
  by 
  Prof. 
  J. 
  S. 
  Newberry, 
  at 
  

   Linton, 
  Columbiana 
  County, 
  Ohio. 
  

  

  