﻿jRocks, 
  in 
  Littleton, 
  New 
  Hampshire. 
  

  

  249 
  

  

  is 
  not 
  well 
  preserved 
  in 
  any 
  specimen, 
  we 
  cannot 
  tell 
  whether 
  

   or 
  not 
  spines 
  were 
  present. 
  

  

  (3) 
  Spirifer 
  sp.? 
  (fig. 
  9) 
  . 
  This 
  is 
  the 
  most 
  abundant 
  species. 
  

   We 
  have 
  portions 
  of 
  six 
  brachial 
  valves 
  and 
  of 
  one 
  pedicle 
  

   valve. 
  In 
  no 
  case 
  were 
  the 
  two 
  valves 
  found 
  together. 
  The 
  

   shell 
  is 
  30 
  or 
  40 
  mm 
  wide 
  and 
  15 
  or 
  20 
  mm 
  long. 
  The 
  brachial 
  

   valve 
  is 
  characterized 
  by 
  a 
  large 
  unstriated 
  median 
  fold 
  and, 
  

   on 
  each 
  side 
  of 
  it, 
  six 
  or 
  seven 
  strong, 
  rounded, 
  radial 
  plica- 
  

   tions 
  that 
  become 
  narrower 
  and 
  lower 
  near 
  the 
  hinge-line. 
  

   There 
  are 
  no 
  radial 
  strise. 
  Very 
  fine, 
  thread-like, 
  concentric 
  

  

  Fig. 
  

  

  Fig. 
  9. 
  

  

  Fig. 
  8. 
  Chonetes 
  sp. 
  

  

  Fig. 
  9. 
  Spirifer 
  sp.? 
  

  

  growth 
  lines 
  may 
  be 
  seen 
  in 
  some 
  specimens. 
  The 
  hinge-line 
  

   is 
  straight 
  and 
  the 
  beak 
  is 
  small. 
  

  

  The 
  pedicle 
  valve 
  resembles 
  the 
  brachial 
  valve 
  except 
  that 
  

   it 
  has 
  a 
  median 
  sinus 
  instead 
  of 
  a 
  median 
  fold. 
  

  

  Both 
  valves 
  are 
  moderately 
  convex. 
  

  

  (4) 
  Spirifer 
  sp.? 
  : 
  All 
  the 
  best 
  specimens 
  seem 
  to 
  be 
  brachial 
  

   valves. 
  The 
  impression 
  is 
  broadly 
  convex. 
  There 
  are 
  in 
  all 
  

   about 
  twenty-four 
  radial 
  ribs, 
  a 
  dozen 
  on 
  each 
  side 
  of 
  a 
  rather 
  

   inconspicuous 
  median 
  fold. 
  No 
  concentric 
  growth 
  lines 
  are 
  

   visible. 
  The 
  hinge-line 
  is 
  poorly 
  preserved, 
  but 
  seems 
  to 
  have 
  

   been 
  straight. 
  The 
  beak 
  is 
  more 
  prominent 
  than 
  in 
  the 
  pre- 
  

   ceding 
  species. 
  

  

  There 
  are 
  several 
  other 
  species 
  and 
  genera 
  among 
  the 
  

   specimens, 
  but 
  they 
  are 
  too 
  fragmentary 
  even 
  for 
  generic 
  deter- 
  

   mination. 
  One 
  looks 
  like 
  a 
  Spirifer 
  of 
  the 
  type 
  of 
  ti. 
  Mur- 
  

   chisoni. 
  Another 
  appears 
  to 
  be 
  a 
  Spirifer 
  with 
  very 
  few 
  and 
  

   very 
  distinct 
  ribs. 
  We 
  shall 
  postpone 
  the 
  description 
  of 
  these 
  

   more 
  doubtful 
  forms 
  until 
  more 
  satisfactory 
  samples 
  have 
  been 
  

   obtained. 
  

  

  The 
  writer's 
  examination 
  of 
  these 
  fossils 
  led 
  him 
  to 
  believe 
  

   that 
  they 
  were 
  unmistakably 
  of 
  Devonian 
  age. 
  He, 
  therefore, 
  

   sent 
  them 
  to 
  Dr. 
  John 
  M. 
  Clarke, 
  who 
  kindly 
  consented 
  to 
  

   look 
  them 
  over. 
  In 
  a 
  letter 
  to 
  the 
  author 
  he 
  wrote, 
  " 
  I 
  should 
  

   hesitate 
  to 
  identify 
  any 
  single 
  species 
  among 
  these, 
  though 
  they 
  

   are 
  to 
  me 
  conclusively 
  early 
  Devonian." 
  

  

  