﻿AND 
  AVES 
  OF 
  NORTH 
  AMERICA. 
  159 
  

  

  aa 
  No 
  azygus 
  bone 
  in 
  front 
  of 
  caudal 
  marginal. 
  Prochonias. 
  

   Mesosternum 
  transverse, 
  intergular 
  scute 
  extending 
  to 
  its 
  posterior 
  suture 
  ; 
  first 
  ver- 
  

   tebral 
  scute 
  elongate 
  backwards 
  ; 
  shell 
  thin 
  ; 
  pubic 
  scar 
  wide, 
  not 
  elevated 
  ; 
  inguinal 
  cos- 
  

   tal 
  pit 
  plane, 
  xiphisternum 
  thin 
  edged 
  ; 
  size 
  medium. 
  t. 
  longinuchus. 
  

  

  Mesosternum 
  longitudinal, 
  narrowed; 
  first 
  vertebral 
  scute 
  shortened; 
  costal 
  bones 
  

   reticulate 
  sculptured 
  ; 
  pubic 
  scar 
  long, 
  narrowed, 
  not 
  elevated 
  ; 
  inguinal 
  costal 
  pit 
  plane 
  ; 
  

   xiphisternum 
  thin 
  edged 
  ; 
  size 
  large. 
  t. 
  sulcatus. 
  

  

  ««« 
  Posterior 
  vertebrals 
  not 
  known. 
  

   Mesosternal 
  bone 
  as 
  broad 
  as 
  long 
  ; 
  the 
  intergular 
  scute 
  not 
  reaching 
  its 
  posterior 
  

   margin 
  ; 
  first 
  vertebral 
  scute 
  shortened 
  ; 
  inguinal 
  costal 
  pit 
  plane 
  ; 
  shell 
  thin 
  ; 
  size 
  

   smaller 
  ; 
  pubic 
  scar 
  wedge-shaped. 
  t. 
  leslianus. 
  

  

  Mesosternal 
  \ 
  costal 
  bones 
  reticulate 
  or 
  parallel 
  grooved 
  ; 
  inguinal 
  costal 
  pit 
  elevated 
  

   inwardly, 
  descending 
  to 
  usual 
  plane 
  distally, 
  its 
  fundus 
  keeled 
  ; 
  xiphisternum 
  with 
  thick 
  

   obtuse 
  margin 
  behind 
  ; 
  shell 
  thick, 
  vesicular 
  inferiorly 
  ; 
  very 
  large. 
  p. 
  strenuus. 
  

  

  Carapace 
  thin, 
  surface 
  sculptured 
  with 
  tubercular, 
  ridge-like 
  or 
  vermiform 
  prominences 
  

   in 
  strong 
  relief; 
  angle 
  of 
  bridge 
  obtuse 
  ; 
  size 
  large. 
  p. 
  nodosus. 
  

  

  Either 
  Prochonias 
  or 
  Taphrosphys 
  may 
  hereafter 
  be 
  found 
  to 
  be 
  identical 
  with 
  Both- 
  

   remys, 
  Leidy. 
  

  

  TAPHROSPHYS 
  MOLOPS, 
  Cope. 
  

  

  Large, 
  stout; 
  costal 
  bones, 
  3.6 
  inches 
  in 
  thickness 
  at 
  their 
  proximal 
  portions; 
  the 
  posterior 
  narrower 
  than 
  the 
  ante- 
  

   rior, 
  and 
  thinning 
  out 
  exceedingly 
  at 
  their 
  extremities. 
  Hyosternal 
  3.6 
  lines 
  thick 
  behind, 
  costal 
  plates 
  with 
  longi- 
  

   tudinal 
  grooves, 
  marginals 
  and 
  parts 
  of 
  plastron 
  reticulate, 
  other 
  parts 
  of 
  plastron 
  open 
  reticulate, 
  or 
  with 
  inosculating 
  

   striae. 
  Proximal 
  end 
  of 
  anterior 
  rib-plates 
  very 
  coarsely 
  reticulate. 
  Vertebral 
  scutes 
  large, 
  as 
  broad 
  or 
  broader 
  than 
  

   long, 
  with 
  straight 
  margins. 
  Some 
  of 
  the 
  costal 
  capitula 
  small, 
  others 
  large, 
  those 
  of 
  the 
  first 
  pair 
  with 
  a 
  high 
  pro- 
  

   jecting 
  keel 
  alongside 
  of 
  them, 
  which 
  have 
  sutural 
  extremity 
  next 
  the 
  vertebra. 
  

  

  This 
  species 
  is 
  indicated 
  by 
  many 
  specimens. 
  Among 
  these 
  may 
  be 
  mentioned 
  a 
  large 
  part 
  of 
  the 
  carapace 
  and 
  

   plastron 
  of 
  an 
  individual 
  from 
  near 
  Barnesboro, 
  fewer 
  parts 
  of 
  another 
  from 
  Gloucester 
  County, 
  New 
  Jersey, 
  and 
  

   part 
  of 
  the 
  carapace 
  of 
  two 
  others 
  from 
  Birmingham, 
  Burlington 
  County. 
  Also, 
  one 
  costal 
  and 
  two 
  sternal 
  bones, 
  in 
  

   the 
  possession 
  of 
  the 
  State 
  Survey 
  of 
  New 
  Jersey, 
  at 
  New 
  Brunswick, 
  from 
  the 
  middle 
  green 
  sand 
  bed 
  of 
  Tinton 
  Falls. 
  

   Monmouth 
  Co., 
  N. 
  J., 
  with 
  fragmentary 
  specimens 
  from 
  various 
  other 
  places. 
  

  

  These 
  show 
  the 
  species 
  to 
  have 
  been 
  more 
  massive 
  than 
  the 
  P. 
  sulcatus 
  ; 
  all 
  the 
  pieces, 
  but 
  more 
  especially 
  the 
  

   costal 
  bones, 
  are 
  thicker 
  and 
  heavier. 
  

  

  The 
  first 
  costal 
  bones 
  are 
  remarkable 
  for 
  a 
  deep 
  curved 
  elongate 
  pit 
  with 
  raised 
  edges, 
  for 
  the 
  purpose 
  of 
  receiving 
  

   the 
  upper 
  extremity 
  of 
  the 
  hyosternal 
  axillary 
  buttress. 
  It 
  is 
  deepest 
  posteriorly, 
  and 
  is 
  curved 
  forwards 
  and 
  in- 
  

   wards. 
  The 
  distal 
  margin 
  presents 
  two 
  outlines, 
  both 
  thinned 
  out 
  and 
  in 
  contact 
  with 
  a 
  marginal 
  by 
  a 
  weak 
  squamous 
  

   suture, 
  without 
  any 
  gomphosis. 
  Indeed, 
  the 
  recurrent 
  part 
  of 
  the 
  margin, 
  which 
  formed 
  a 
  notch 
  in 
  the 
  disc, 
  was 
  not 
  

  

  