﻿60-B 
  THE 
  EXTINCT 
  BATRACHIA, 
  REPTILIA 
  

  

  M. 
  M. 
  

  

  Length, 
  .075 
  Inner, 
  .005 
  

  

  Proximal 
  expanse, 
  outer 
  measurement, 
  .052 
  

   The 
  portion 
  of 
  the 
  pelvis 
  preserved 
  consists 
  of 
  the 
  proximal 
  halves 
  of 
  left 
  ilium 
  and 
  ischium, 
  the 
  anterior 
  portion 
  

   of 
  the 
  latter 
  being 
  broken 
  away. 
  This 
  fragment 
  is 
  not 
  Dinosaurian; 
  the 
  longitudinal 
  expansion 
  forbids 
  the 
  reference 
  

   of 
  the 
  ilium 
  as 
  the 
  ischiopubis 
  of 
  a 
  Dicynodont, 
  and 
  the 
  ischium 
  is 
  too 
  different 
  to 
  be 
  regarded 
  as 
  the 
  scapula 
  of 
  a 
  

   Belodont. 
  It 
  presents 
  a 
  broad 
  shallow 
  concavity 
  as 
  acetabulum, 
  which 
  on 
  the 
  inner 
  face 
  is 
  grooved 
  and 
  ridged 
  at 
  the 
  

   inferior 
  margin, 
  as 
  though 
  united 
  to 
  the 
  ischium 
  by 
  suture. 
  This 
  is 
  well 
  shown 
  in 
  Emmons' 
  figures 
  of 
  the 
  same 
  bone 
  

   of 
  another 
  species, 
  in 
  North 
  Amer. 
  Geology, 
  PI. 
  VI. 
  The 
  upper 
  plane 
  of 
  this 
  element 
  is 
  abruptly 
  curved 
  backwards 
  

   and 
  then 
  broken 
  away. 
  The 
  supposed 
  ischium 
  presents 
  a 
  marked 
  acetabular 
  articular 
  face 
  at 
  its 
  posterior 
  connection 
  

   with 
  the 
  ilium. 
  Its 
  posterior 
  margin 
  is 
  much 
  thickened, 
  and 
  becomes 
  decurved 
  towards 
  the 
  symphysis, 
  which 
  is 
  lost. 
  

   It 
  sends 
  a 
  limb 
  anteriorly 
  along 
  the 
  line 
  of 
  union 
  with 
  the 
  ilium, 
  and 
  apparently 
  terminates 
  in 
  a 
  narrow 
  obtuse 
  ex- 
  

   tremity 
  with 
  rugose 
  margins. 
  Its 
  supposed 
  obtruator 
  margin 
  is 
  thickened 
  along 
  this 
  process; 
  the 
  main 
  body 
  of 
  the 
  

   bone 
  is 
  flattened 
  at 
  a 
  strong 
  angle 
  with 
  the 
  posterior 
  margin, 
  and 
  turned 
  away 
  anteriorly 
  like 
  the 
  ilium 
  of 
  a 
  Dicyno- 
  

   dont, 
  and 
  includes 
  an 
  incomplete 
  oval 
  foramen 
  with 
  the 
  acetabular 
  process. 
  The 
  -two 
  pelvic 
  elements 
  are 
  crushed 
  

  

  nearlv 
  into 
  one 
  plane. 
  

  

  M. 
  M. 
  

  

  Length 
  of 
  fragment, 
  0.167 
  Width 
  ischium 
  at 
  foramen, 
  .055 
  

  

  " 
  ilium 
  to 
  posterior 
  process, 
  .0715 
  Thickness 
  " 
  distally, 
  .021 
  

  

  " 
  iliac 
  suture 
  of 
  ischium, 
  .092 
  

  

  The 
  mode 
  of 
  attachment 
  of 
  the 
  pubis 
  is 
  not 
  indicated 
  in 
  this 
  specimen, 
  but 
  it 
  was 
  evidently 
  quite 
  different 
  from 
  

   that 
  in 
  the 
  Crocodilia. 
  

  

  The 
  femur 
  is 
  that 
  of 
  the 
  left 
  side; 
  it 
  is 
  perfect, 
  except 
  that 
  the 
  portion 
  usually 
  supporting 
  the 
  third 
  trochanter 
  is 
  

   broken 
  out; 
  say 
  two 
  inches. 
  The 
  head 
  is 
  Crocodilian, 
  i. 
  e., 
  without 
  neck 
  and 
  compressed 
  in 
  one 
  plane. 
  Its 
  extrem- 
  

   ity 
  is 
  slightly 
  convex 
  inwards, 
  the 
  inner 
  extremity 
  thickened, 
  convex 
  and 
  decurved; 
  the 
  extero-posterior 
  thinned 
  and 
  

   curved 
  backwards 
  slightly. 
  The 
  margin 
  continued 
  from 
  the 
  latter 
  is 
  therefore 
  thinned, 
  though 
  obtuse 
  edged, 
  and 
  

   encloses 
  a 
  wide 
  shallow 
  groove 
  with 
  the 
  inner, 
  thickened 
  margin. 
  There 
  are 
  no 
  distinct 
  trochanters. 
  The 
  shaft 
  is 
  

   quite 
  slender, 
  obliquely 
  spherical 
  triangular 
  in 
  section, 
  with 
  an 
  inner 
  ridge 
  in 
  front, 
  and 
  outer 
  behind. 
  The 
  medul- 
  

   lary 
  cavity 
  is 
  very 
  small. 
  At 
  the 
  distal 
  third 
  the 
  shaft 
  is 
  flattened 
  antero-posteriorly. 
  The 
  trochlear 
  groove 
  is 
  wide 
  

   and 
  shallow, 
  and 
  the 
  condyles 
  project 
  less 
  posteriorly 
  than 
  is 
  usual; 
  they 
  have, 
  however, 
  been 
  under 
  considerable 
  

   pressure. 
  The 
  inner 
  is 
  wider 
  and 
  shallower, 
  the 
  outer 
  narrower 
  and 
  deeper. 
  Their 
  extremital 
  faces 
  are 
  separated 
  by 
  

   an 
  open 
  notch. 
  

  

  The 
  fibula 
  is 
  a 
  long 
  slender 
  bone, 
  having 
  a 
  slight 
  sigmoid 
  flexure, 
  and 
  ridges 
  twisted 
  round 
  the 
  flattened 
  shaft. 
  

   The 
  extremities 
  are 
  more 
  flattened, 
  both 
  in 
  the 
  same 
  plane; 
  the 
  proximal 
  is 
  broken 
  away; 
  the 
  distal 
  is 
  obtuse, 
  one 
  end 
  

   terminating 
  in 
  a 
  point; 
  the 
  surface 
  rugose. 
  Its 
  form 
  is 
  Lacertilian. 
  

  

  M. 
  M. 
  

  

  Length 
  femur, 
  restored, 
  0.34 
  Diameter 
  condyles, 
  inner, 
  fore 
  and 
  aft, 
  0.045 
  

  

  Diameter 
  head, 
  antero-posterior, 
  0.09 
  Length 
  fibula, 
  broken,* 
  0.24 
  

  

  " 
  " 
  transverse 
  (greatest), 
  0.044 
  Diameter 
  perfect 
  extremity, 
  0.035 
  

  

  " 
  shaft 
  at 
  middle, 
  0.045 
  " 
  imperfect 
  " 
  0.042 
  

  

  " 
  condyles, 
  transverse, 
  0.083 
  " 
  shaft, 
  0.025 
  

  

  What 
  is 
  doubtfully 
  referred 
  as 
  a 
  distal 
  phalange, 
  resembles 
  that 
  ascribed 
  to 
  a 
  species 
  of 
  the 
  genus 
  by 
  Meyer, 
  but 
  

   as 
  I 
  cannot 
  find 
  lateral 
  grooves, 
  and 
  the 
  proximal 
  articulations 
  are 
  concealed 
  by 
  matrix, 
  it 
  may 
  not 
  be 
  such. 
  One 
  

   lateral 
  margin 
  is 
  obtuse, 
  the 
  other 
  acute; 
  body 
  thinned 
  out 
  to 
  tip, 
  flat 
  in 
  cross 
  section 
  below, 
  concave 
  in 
  longitudinal, 
  

  

  as 
  wide 
  distally 
  as 
  proximally. 
  

  

  M. 
  M. 
  

  

  Length, 
  .035 
  Depth 
  proximally, 
  .0105 
  

  

  Width 
  distally, 
  .017 
  

  

  Surface 
  striate-rugose 
  ; 
  lines 
  of 
  the 
  upper 
  surface 
  converging 
  toward 
  a 
  median 
  point 
  from 
  the 
  base. 
  

   Several 
  more 
  or 
  less 
  broken, 
  and 
  one 
  complete 
  rib 
  are 
  preserved. 
  The 
  two 
  heads 
  are 
  distinct. 
  The 
  perfect 
  rib 
  

  

  