﻿18fi 
  Mr. 
  M. 
  A. 
  C. 
  Ilinton 
  on 
  

  

  Allied 
  to 
  P. 
  staJogmoptera, 
  8talj 
  but 
  with 
  the 
  opercula 
  

   largei-, 
  distinctly 
  narrowed, 
  and 
  obtusely 
  aiioularly 
  pro- 
  

   duced 
  at 
  their 
  apices, 
  and 
  there 
  broadly 
  black 
  ; 
  pronotum 
  

   much 
  narrower 
  between 
  the 
  apices 
  of 
  the 
  lateral 
  angulate 
  

   margins. 
  

  

  Synonymical 
  Note. 
  

   Balsira 
  crassa, 
  Dist. 
  Ann. 
  & 
  Mag. 
  Nat. 
  Hist. 
  (7) 
  ii. 
  p. 
  303 
  (1898). 
  

  

  Schouteden 
  (Rev. 
  Zool. 
  Afr. 
  ii. 
  p. 
  107 
  (1912), 
  in 
  

   enumerating 
  this 
  species 
  from 
  the 
  Transvaal, 
  writes 
  '^ 
  cette 
  

   espece 
  a 
  ete 
  decrite 
  comnie 
  Uleioni/mia 
  [Dcdsira 
  ol.) 
  par 
  

   Distant." 
  

  

  I 
  described 
  it 
  as 
  Dalsira 
  (supra) 
  in 
  18ii8, 
  and, 
  as 
  the 
  genus 
  

   Metonymia 
  was 
  only 
  proposed 
  by 
  Kirkaldy 
  in 
  1909, 
  1 
  cannot 
  

   well 
  be 
  charged 
  with 
  an 
  impossibility. 
  

  

  XVI. 
  — 
  On 
  some 
  Remains 
  of 
  Rodents 
  from 
  the 
  Red 
  Crag 
  of 
  

   (Suffolk 
  and 
  from 
  the 
  Norfolk 
  Forest-Bed. 
  By 
  Maktin 
  

   A.. 
  0. 
  HiNTON. 
  

  

  [Plate 
  VIII.] 
  

  

  In 
  the 
  present 
  paper 
  some 
  impoitant 
  fossils 
  from 
  the 
  Red- 
  

   Urag 
  and 
  the 
  Forest-Bed 
  series 
  of 
  Norfolk 
  are 
  described. 
  

   These 
  materials 
  appertain 
  to 
  the 
  genera 
  Castor, 
  Trogon- 
  

   theriuvi, 
  and 
  Sciurus. 
  1 
  have 
  to 
  return 
  my 
  best 
  thanks 
  to 
  

   Major 
  Moore, 
  of 
  Felixstowe, 
  Mr. 
  A. 
  C. 
  Savin, 
  of 
  Cromer, 
  

   and 
  Mr. 
  Gilbert 
  White 
  for 
  the 
  loan 
  or 
  gift 
  of 
  the 
  specimens 
  

   described. 
  

  

  1. 
  Castor. 
  

   (a) 
  Castor 
  veterior, 
  Lankester. 
  

  

  A 
  fragmentary 
  right 
  ramus 
  in 
  the 
  collection 
  of 
  Major 
  Moore, 
  

   from 
  the 
  lied 
  Crag 
  of 
  Woodbridge, 
  Suffolk, 
  is 
  referred 
  to 
  this 
  

   species. 
  In 
  this 
  specimen 
  (PI. 
  Vlll. 
  fig. 
  1) 
  j^l, 
  1^\, 
  and 
  part 
  of 
  

   ^^ 
  are 
  in 
  place. 
  The 
  crown 
  of 
  j^ 
  is 
  fully 
  developed, 
  while 
  

   ^7i 
  has 
  well-deveh'ped 
  fangs 
  (fig. 
  1, 
  "a"). 
  Each 
  tooth 
  has 
  one 
  

   outer 
  and 
  three 
  inner 
  folds 
  and, 
  as 
  in 
  C. 
  fiber, 
  the 
  enamel 
  is 
  

   uncrimped. 
  The 
  outer 
  fold 
  is 
  persistent, 
  as 
  usual 
  in 
  Castor; 
  

   the 
  anterior 
  and 
  middle 
  inner 
  folds 
  of 
  fri 
  aie 
  also 
  long 
  persistent 
  

   as 
  in 
  C. 
  fiber. 
  The 
  posterior 
  inner 
  fold 
  of 
  pTi 
  and 
  all 
  three 
  

  

  