﻿PELOBATES. 
  

  

  199 
  

  

  not 
  entirely 
  furnislied 
  by 
  it, 
  as 
  is 
  sometimes 
  the 
  

   case.* 
  

  

  Prsecoracoids 
  slender, 
  strongly 
  curved, 
  not 
  entering 
  

   tlie 
  glenoid 
  cavity 
  ; 
  coracoids 
  nearly 
  straight, 
  strongly 
  

   expanded 
  distally 
  ; 
  a 
  cartilaginous 
  omosternum 
  ; 
  ster- 
  

   num 
  with 
  a 
  bony 
  style 
  dilated 
  proximally 
  and 
  a 
  large 
  

   discoid 
  cartilage. 
  Humerus 
  considerably 
  longer 
  than 
  

   radius-ulna. 
  Eight 
  bones 
  in 
  carpus, 
  three 
  of 
  which 
  are 
  

   in 
  contact 
  with 
  radius-ulna 
  ; 
  a 
  single 
  bone 
  in 
  the 
  pollex. 
  

  

  Pelvis 
  five-sevenths 
  to 
  five-sixths 
  the 
  length 
  of 
  the 
  

   vertebral 
  column 
  ; 
  ilia 
  with 
  an 
  inner 
  upper 
  groove 
  

   into 
  which 
  the 
  sacral 
  processes 
  slide; 
  pubis 
  absent 
  

   or 
  reduced 
  to 
  a 
  small 
  bony 
  nodule, 
  not 
  entering 
  the 
  

   acetabulum. 
  Femur 
  and 
  tibia 
  with 
  cartilaginous 
  epi- 
  

   physes 
  ; 
  tibia 
  shorter 
  than 
  the 
  femur, 
  which 
  is 
  shorter 
  

   than 
  the 
  pelvis. 
  Calcaneum 
  slightly 
  shorter 
  than 
  

   astragalus, 
  half 
  as 
  long 
  as 
  tibia; 
  three 
  distal 
  tarsal 
  

   bones 
  ; 
  prgehallux 
  with 
  a 
  single 
  very 
  large, 
  compressed, 
  

   curved 
  phalanx. 
  Terminal 
  phalanges 
  pointed. 
  

  

  Measurements 
  oe 
  Skeleton 
  

  

  ' 
  (in 
  millimetres). 
  

  

  

  (? 
  

  

  ? 
  

  

  Length 
  of 
  skull 
  

  

  14 
  

  

  17 
  

  

  Width 
  of 
  skull 
  

  

  18 
  

  

  24 
  

  

  Least 
  interorbital 
  width 
  . 
  

  

  5 
  

  

  6 
  

  

  Dorsal 
  vertebral 
  column 
  . 
  

  

  14. 
  

  

  18 
  

  

  Urostyle 
  (with 
  sacral 
  vertebra) 
  

  

  10-5 
  . 
  

  

  13 
  

  

  Humerus 
  

  

  12 
  

  

  15 
  

  

  Radius-ulna 
  

  

  8 
  

  

  10 
  

  

  Manus 
  

  

  12 
  

  

  16 
  

  

  Pelvis 
  . 
  . 
  . 
  . 
  

  

  20 
  

  

  22 
  

  

  Femur 
  

  

  17 
  

  

  22 
  

  

  Tibia 
  

  

  15 
  

  

  19 
  

  

  Tarsus 
  

  

  7 
  

  

  9 
  

  

  Pes 
  ... 
  

  

  23 
  

  

  28 
  

  

  * 
  I 
  have 
  long 
  ago 
  pointed 
  out 
  that 
  the 
  vertebral 
  column 
  figured 
  by 
  

   Gene 
  in 
  1839 
  as 
  of 
  Bomhinator 
  belongs 
  to 
  a 
  Pelohates. 
  I 
  should 
  not 
  

   allude 
  to 
  this 
  again 
  were 
  it 
  not 
  for 
  the 
  fact 
  that 
  Gene's 
  error 
  has 
  crept 
  

   into 
  Bateson's 
  ' 
  Study 
  of 
  Yariation,' 
  p. 
  127, 
  in 
  a 
  paragraph 
  marked 
  

   with 
  an 
  asterisk 
  as 
  a 
  sign 
  of 
  special 
  importance 
  to 
  the 
  example 
  quoted, 
  

   and 
  with 
  the 
  addition, 
  by 
  the 
  compiler, 
  of 
  a 
  further 
  error, 
  viz. 
  that 
  the 
  

   specimen 
  came 
  from 
  Sardinia. 
  The 
  sacrum 
  in 
  the 
  Gene 
  specimen, 
  as 
  

   well 
  as 
  in 
  others 
  that 
  have 
  since 
  been 
  described 
  and 
  figured 
  by 
  Adolphi 
  

   (' 
  Morphol. 
  Jahrb.,' 
  xx, 
  1895, 
  p. 
  449, 
  pi. 
  xix), 
  is 
  formed 
  entirely 
  by 
  the 
  

   processes 
  at 
  the 
  base 
  of 
  the 
  urostyle, 
  and 
  there 
  are 
  thus 
  nine 
  instead 
  of 
  

   eight 
  prsesacral 
  vertebrae. 
  

  

  