﻿PLATE 
  XXV— 
  (Continued). 
  

  

  Figs. 
  26, 
  27. 
  Dorsal 
  and 
  lateral 
  views 
  of 
  a 
  less 
  ventricose 
  specimen, 
  with 
  surface 
  

  

  almost 
  entirely 
  covered 
  by 
  fine 
  setae. 
  

   Fig. 
  28. 
  Dorsal 
  view 
  of 
  a 
  specimen 
  with 
  more 
  prominent 
  beak. 
  

  

  Rhynchotreta 
  cuneata 
  (Dalman) 
  var. 
  Americana 
  n. 
  var. 
  

  

  Page 
  167. 
  

  

  Fig. 
  29. 
  Dorsal 
  valve 
  of 
  a 
  small 
  specimen 
  of 
  the 
  usual 
  form. 
  

  

  Fig. 
  30. 
  Dorsal 
  view 
  of 
  a 
  more 
  elongate 
  form. 
  

  

  Figs. 
  31, 
  32. 
  Dorsal 
  and 
  ventral 
  views 
  of 
  a 
  very 
  broad 
  specimen, 
  having 
  strong, 
  

   slightly 
  rounded 
  plications. 
  

  

  Fig. 
  33.. 
  Ventral 
  view 
  of 
  a 
  large 
  specimen, 
  differing 
  somewhat 
  in 
  form 
  from 
  the 
  

   preceding. 
  

  

  Fig. 
  34. 
  Lateral 
  view 
  of 
  the 
  specimen 
  figs. 
  31 
  and 
  32. 
  

  

  Fig. 
  35. 
  Dorsal 
  valve 
  of 
  an 
  extremely 
  elongate 
  form, 
  with 
  narrow 
  plications. 
  

  

  Figs. 
  36, 
  37. 
  Front 
  views 
  of 
  the 
  specimens 
  fig. 
  33 
  and 
  fig. 
  31, 
  showing 
  the 
  ele- 
  

   vation 
  of 
  the 
  front. 
  

  

  Fig. 
  38. 
  Dorsal 
  view 
  of 
  a 
  young 
  shell 
  before 
  the 
  development 
  of 
  the 
  elevation 
  

   of 
  the 
  front 
  and 
  depression 
  of 
  the 
  sides 
  has 
  commenced. 
  

  

  CCELOSPIRA 
  DISPARILIS 
  Rail 
  

   Page 
  162. 
  

  

  Figs. 
  39-41. 
  Dorsal, 
  ventral 
  and 
  lateral 
  views 
  of 
  a 
  specimen, 
  enlarged 
  to 
  two 
  

   diameters, 
  showing 
  the 
  usual 
  characters 
  of 
  the 
  species. 
  

  

  Fig. 
  42. 
  An 
  enlargement 
  of 
  a 
  ventral 
  valve 
  Of 
  a 
  specimen 
  of 
  more 
  elongate 
  form 
  

   and 
  extended 
  beak. 
  

  

  Fig. 
  43. 
  An 
  enlargement 
  of 
  the 
  dorsal 
  side 
  of 
  a 
  broader 
  specimen. 
  The 
  apex 
  of 
  

   . 
  the 
  dorsal 
  valve 
  is 
  represented 
  a 
  little 
  too 
  convex. 
  

  

  Atrypa 
  reticularis 
  (Linn.). 
  

   Page 
  162. 
  

  

  Figs. 
  44, 
  45. 
  Dorsal 
  and 
  ventral 
  views 
  of 
  a 
  specimen 
  showing 
  strong 
  lamella? 
  

   fringing 
  the 
  concentric 
  lines 
  of 
  growth. 
  

  

  Fig. 
  46. 
  Ventral 
  view 
  of 
  a 
  larger 
  and 
  more 
  ventricose 
  specimen, 
  with 
  finer 
  con- 
  

   centric 
  markings. 
  

  

  Fig. 
  47. 
  Lateral 
  view 
  of 
  the 
  same, 
  showing 
  the 
  convexity 
  of 
  the 
  valves. 
  

  

  6 
  

  

  ■ 
  

  

  