﻿t. 
  davidson 
  and 
  w. 
  king 
  on 
  the 
  tbimerelmd^. 
  159 
  

  

  a 
  short 
  distance 
  from 
  the 
  cardinal 
  edge, 
  supported 
  by 
  the 
  septum. 
  

   The 
  length 
  and 
  width 
  appear 
  to 
  be 
  about 
  twelve 
  or 
  fifteen 
  lines 
  " 
  

   (Billings). 
  

  

  Only 
  two 
  internal 
  casts 
  of 
  this 
  species 
  appear 
  to 
  have 
  been 
  found. 
  

   The 
  platforms 
  are 
  of 
  the 
  usual 
  form 
  : 
  that 
  in 
  the 
  brachial 
  valve 
  is 
  

   excavated 
  ; 
  and 
  at 
  its 
  posterior 
  end 
  is 
  situated 
  the 
  subcardinal 
  scar, 
  

   w, 
  which 
  is 
  well 
  pronounced. 
  The 
  crescent 
  in 
  the 
  same 
  valve 
  has 
  

   its 
  crown 
  rather 
  deeply 
  impressed 
  on 
  the 
  hinge 
  ; 
  and 
  its 
  sides 
  are 
  

   expanded, 
  though 
  not 
  shown 
  in 
  the 
  drawing 
  (fig. 
  10). 
  

  

  We 
  are 
  indebted 
  to 
  the 
  kindness 
  of 
  Mr. 
  Billings 
  for 
  the 
  opportu- 
  

   nity 
  of 
  examining 
  the 
  original 
  and 
  typical 
  specimens. 
  It 
  occurs 
  in 
  

   the 
  same 
  formation 
  and 
  locality 
  with 
  M. 
  prisca. 
  

  

  X. 
  DlNOBOLUS 
  AND 
  ITS 
  SPECIES. 
  

  

  Dinobolus 
  *, 
  Hall, 
  1871. 
  

  

  Obolus, 
  Davidson, 
  1853; 
  Lindstrom, 
  1867; 
  Hallf, 
  1868. 
  

  

  Dinobolus, 
  Hall, 
  "March 
  1871." 
  t 
  

  

  RJiynobolus 
  (in 
  part), 
  Hall, 
  1871. 
  

  

  Ungulite-s, 
  Quenstedt, 
  1871. 
  

  

  Obdellma, 
  Billings, 
  Dec. 
  29th, 
  1871 
  §, 
  &c. 
  

  

  Shell 
  circular, 
  or 
  generally 
  wider 
  than 
  long. 
  Valves 
  moderately 
  

   thick. 
  Pedicle-valve 
  with 
  a 
  slightly 
  prominent 
  evenly 
  formed 
  

   umbo 
  : 
  area 
  wider 
  than 
  long 
  : 
  platform 
  more 
  or 
  less 
  sinuated 
  ; 
  

   widely 
  V-shaped 
  ; 
  and 
  slightly 
  raised 
  in 
  front 
  : 
  crescent 
  prominently 
  

   marked 
  in 
  its 
  crown 
  and 
  sides 
  : 
  hinge 
  moderately 
  thick 
  ; 
  with 
  a 
  

   rounded 
  edge, 
  on 
  which 
  and 
  in 
  front 
  of 
  the 
  cardinal 
  facet 
  is 
  a 
  pair 
  

  

  * 
  The 
  synonymy 
  of 
  the 
  present 
  genus, 
  and 
  the 
  quotations 
  added, 
  have 
  in- 
  

   fluenced 
  us 
  in 
  the 
  adoption 
  of 
  the 
  name 
  Dinobolus. 
  

  

  t 
  "Some 
  years 
  since, 
  having 
  these 
  fossils 
  under 
  consideration, 
  I 
  proposed 
  a 
  

   new 
  generic 
  name 
  for 
  them 
  ; 
  but 
  sending 
  drawings 
  to 
  Mr. 
  Davidson, 
  he 
  gave 
  me 
  

   the 
  opinion 
  of 
  himself 
  and 
  Mr. 
  Woodward 
  that 
  they 
  belonged 
  to 
  the 
  genus 
  

   Obolus. 
  There 
  are 
  certain 
  points 
  of 
  difference, 
  however, 
  which 
  I 
  have 
  been 
  in- 
  

   clined 
  to 
  believe 
  are 
  of 
  generic 
  importance 
  ; 
  and 
  I 
  am 
  not 
  entirely 
  satisfied 
  in 
  

   referring 
  them 
  to 
  that 
  genus, 
  as 
  illustrated, 
  though 
  closely 
  allied 
  to 
  it" 
  (Twen- 
  

   tieth 
  Report 
  of 
  the 
  State 
  Cabinet, 
  p. 
  368). 
  (It 
  is 
  only 
  fair 
  I 
  should 
  admit 
  that 
  

   Professor 
  Hall 
  is 
  correct 
  in 
  his 
  more 
  recent 
  statement 
  [see 
  ' 
  American 
  Journal 
  

   of 
  Science 
  and 
  Arts 
  ' 
  for 
  August 
  1872, 
  p. 
  20] 
  that, 
  in 
  a 
  letter 
  of 
  date 
  31st 
  October, 
  

   1862, 
  he 
  proposed 
  to 
  me 
  the 
  generic 
  name 
  Conradia 
  for 
  this 
  fossil. 
  — 
  T. 
  D.) 
  

  

  J 
  ' 
  Notes 
  on 
  some 
  new 
  and 
  imperfectly 
  known 
  forms 
  among 
  the 
  Brachiopoda. 
  

   " 
  This 
  pamphlet 
  was 
  published 
  in 
  March 
  1871, 
  and 
  a 
  number 
  between 
  twenty-live 
  

   and 
  thirty 
  copies 
  delivered 
  to 
  me 
  at 
  the 
  time. 
  The 
  type 
  was 
  left 
  standing 
  in 
  order 
  

   to 
  print 
  a 
  large 
  number 
  to 
  be 
  accompanied 
  by 
  a 
  plate 
  of 
  figures 
  then 
  in 
  progress, 
  

   with 
  descriptions 
  of 
  the 
  same. 
  Of 
  these 
  copies 
  the 
  greater 
  part 
  were 
  distributed 
  

   in 
  the 
  United 
  States 
  soon 
  after 
  publication. 
  Cojiies 
  were 
  sent 
  to 
  the 
  Geological 
  

   Society 
  of 
  London, 
  to 
  Mr. 
  Davidson, 
  M. 
  Barrande, 
  Dr. 
  Lindstrom, 
  Dr. 
  Geinitz, 
  

   and 
  others. 
  The 
  pamphlet 
  is 
  noticed 
  in 
  the 
  ' 
  Jahrbuch' 
  for 
  1871, 
  p. 
  989. 
  On 
  

   the 
  7th 
  of 
  April, 
  1871, 
  the 
  printing 
  establishment 
  of 
  Weed, 
  Parsons, 
  and 
  Co. 
  

   was 
  destroyed 
  by 
  fire, 
  together 
  with 
  the 
  Twenty-third 
  Beport 
  of 
  the 
  State 
  

   Museum 
  (printed 
  to 
  nearly 
  200 
  pages), 
  the 
  lithograph-stones, 
  and 
  every 
  thing 
  

   else 
  pertaining 
  to 
  the 
  work."— 
  Op. 
  cit. 
  

  

  § 
  Canadian 
  Naturalist, 
  vol. 
  vi. 
  p. 
  222, 
  1871 
  ; 
  and 
  p. 
  330, 
  April 
  1872 
  ; 
  also 
  

   American 
  Journal 
  of 
  Science, 
  April 
  and 
  May 
  1872. 
  

  

  n2 
  

  

  