﻿AND 
  AVES 
  OF 
  NORTH 
  AMERICA. 
  

  

  19 
  

  

  This 
  species 
  is 
  larger 
  than 
  the 
  0. 
  pec- 
  Fig. 
  2. 
  

  

  tinatus, 
  and 
  about 
  equal 
  to 
  the 
  Urocor- 
  

   dylus 
  wandesfordii 
  Huxl. 
  The 
  caudal 
  

   spines 
  differ 
  in 
  the 
  greater 
  attenuation 
  of 
  

   the 
  neural 
  series, 
  and 
  the 
  presence 
  of 
  a 
  

   basal 
  lamina 
  on 
  the 
  haemal. 
  The 
  caudal 
  

   region 
  is 
  represented 
  by 
  a 
  portion 
  of 
  the 
  

   vertebral 
  column 
  three 
  inches 
  in 
  length. 
  

   In 
  this 
  space 
  may 
  be 
  counted 
  twenty-four 
  

   vertebrae. 
  Such 
  of 
  the 
  latter 
  whose 
  out- 
  

   lines 
  are 
  visible, 
  display 
  centra 
  character- 
  

   istic 
  of 
  the 
  genus 
  ; 
  their 
  terminal 
  concavi- 
  

   ties 
  conic, 
  with 
  apices 
  meeting 
  in 
  the 
  

   centrum, 
  medially 
  ; 
  zygapophyses 
  rudi- 
  

   meivtal 
  if 
  present. 
  

  

  Characteristic 
  of 
  the 
  species 
  are 
  the 
  

   remarkable 
  length 
  and 
  slenderness 
  of 
  the 
  

   fan-shaped 
  neural 
  and 
  haemal 
  spines, 
  and 
  caudal 
  vebtebe^e, 
  nat. 
  size. 
  

  

  the 
  absence 
  of 
  an 
  acute 
  serration 
  on 
  their 
  margins. 
  In 
  this 
  species 
  the 
  spines 
  have 
  a 
  laminiform 
  expansion 
  at 
  the 
  

   base 
  in 
  their 
  plane. 
  In 
  the 
  other 
  species 
  here 
  described 
  these 
  spines 
  are 
  not 
  only 
  relatively 
  broader 
  and 
  more 
  fan- 
  

   shaped, 
  but 
  they 
  are 
  acutely 
  serrate 
  on 
  the 
  margin 
  and 
  constricted 
  at 
  the 
  base. 
  

  

  In 
  C. 
  reinex 
  the 
  dilate 
  haemal 
  spines 
  are 
  a 
  little 
  more 
  than 
  three 
  times 
  as 
  broad 
  distally, 
  as 
  they 
  are 
  long, 
  

   while 
  the 
  neural 
  spines 
  are 
  a 
  little 
  narrower. 
  The 
  haemal 
  spines 
  stand 
  about 
  the 
  middle 
  of 
  the 
  centrum. 
  The 
  

   basal 
  half 
  is 
  furnished 
  with 
  an 
  anterior 
  ala, 
  which 
  leaves 
  the 
  anterior 
  margin 
  rather 
  abruptly 
  and 
  extends 
  to 
  the 
  

   next 
  spine 
  in 
  advance. 
  It 
  returns 
  gradually 
  to 
  the 
  centrum 
  and 
  is 
  separated 
  from 
  the 
  articular 
  face 
  of 
  the 
  latter 
  

   by 
  a 
  notch. 
  A 
  similar 
  ala 
  exists 
  on 
  the 
  posterior 
  margin 
  of 
  the 
  haemal 
  spine, 
  which 
  extends 
  for 
  a 
  shorter 
  distance 
  

   above 
  the 
  base, 
  and 
  is 
  narrower 
  than 
  the 
  anterior. 
  Each 
  spine 
  presents 
  a 
  median 
  groove 
  on 
  its 
  surface, 
  which 
  

   extends 
  half 
  way 
  to 
  the 
  base 
  or 
  further 
  ; 
  on 
  each 
  side 
  of 
  this 
  are 
  some 
  three 
  other 
  grooves 
  which 
  extend 
  but 
  a 
  

   short 
  distance 
  ; 
  surface 
  otherwise 
  smooth. 
  The 
  ends 
  of 
  the 
  grooves 
  slightly 
  notch 
  the 
  truncated 
  end 
  of 
  the 
  spine. 
  

  

  The 
  neural 
  spines 
  are 
  on 
  the 
  posterior 
  portions 
  of 
  the 
  centra, 
  and 
  not 
  in 
  contact 
  with 
  the 
  bases 
  of 
  those 
  adjacent. 
  

   They 
  are 
  without 
  the 
  dilatations 
  of 
  the 
  haemal 
  spines, 
  and 
  are 
  directed 
  rather 
  more 
  obliquely 
  backwards. 
  They 
  

   are 
  similarly 
  grooved, 
  though 
  without 
  that 
  so 
  distinctly 
  median, 
  seen 
  in 
  the 
  haemal 
  series. 
  

  

  Both 
  neural 
  and 
  haemal 
  spines 
  become 
  stronger 
  towards 
  the 
  anterior 
  part 
  of 
  the 
  vertebral 
  column. 
  There 
  

   appear 
  to 
  be 
  no 
  zygapophyses 
  nor 
  diapophyses, 
  nor 
  rudiments 
  of 
  ribs. 
  The 
  centra 
  are 
  rather 
  stout 
  and 
  somewhat 
  

   constricted 
  medially. 
  There 
  are 
  no 
  traces 
  of 
  dermal 
  armature 
  of 
  any 
  kind. 
  

  

  Measurements. 
  

   Length 
  of 
  a 
  posterior 
  centrum, 
  

   Depth 
  do. 
  do. 
  do. 
  

   Length 
  haemal 
  spine 
  of 
  adjoining 
  vert., 
  

   Basal 
  width, 
  

   Median 
  width, 
  

   Distal 
  width, 
  

  

  Length 
  of 
  a 
  more 
  anterior 
  haemal 
  spine, 
  

   Distal 
  width 
  do. 
  do. 
  do., 
  

   Length 
  anterior 
  neural 
  spine, 
  

   Width 
  do. 
  do. 
  

  

  Lines. 
  

   1.2 
  

  

  1 
  

  

  4.4 
  

   1.4 
  

   .9 
  

   1.1 
  

   4.3 
  

   1.5 
  

   4 
  

   1.4 
  

  

  From 
  the 
  Coal 
  Measures, 
  the 
  Bituminous 
  basin 
  at 
  Linton, 
  Columbiana 
  County, 
  Ohio, 
  near 
  the 
  Ohio 
  River. 
  

   Prof. 
  J. 
  S. 
  Newberry. 
  

  

  