﻿

  

  PLATE 
  XXVI 
  — 
  ( 
  Continued). 
  

  

  Fig. 
  39. 
  Front 
  view 
  of 
  the 
  specimen 
  fig. 
  36, 
  showing 
  a 
  broader 
  elevation 
  than 
  

  

  the 
  last 
  figure. 
  

   Fig. 
  40. 
  Cardinal 
  view 
  of 
  the 
  more 
  finely 
  plicated 
  variety. 
  

  

  Anastrophia 
  internascens 
  n. 
  sp. 
  

   Page 
  168. 
  

  

  Figs. 
  41, 
  42. 
  Ventral 
  and 
  dorsal 
  views 
  of 
  a 
  small 
  specimen, 
  more 
  finely 
  plicated 
  

  

  than 
  usual. 
  

   Figs. 
  43-46. 
  Ventral, 
  lateral, 
  dorsal 
  and 
  front 
  views 
  of 
  a 
  specimen 
  of 
  medium 
  

  

  size, 
  having 
  coarse 
  plications. 
  

   Figs. 
  47-49. 
  Dorsal, 
  cardinal 
  and 
  ventral 
  views 
  of 
  a 
  specimen 
  of 
  the 
  usual 
  

  

  character. 
  

  

  ElCHWALDIA 
  RETICULATA 
  Hall. 
  

   Page 
  169. 
  

  

  Fig. 
  50. 
  Dorsal 
  valve 
  of 
  a 
  narrow, 
  elongate 
  form, 
  with 
  a 
  scarcely 
  distinguisha- 
  

   ble 
  mesial 
  fold. 
  

  

  Fig. 
  51. 
  Ventral 
  side 
  of 
  a 
  larger 
  and 
  more 
  transverse 
  specimen, 
  showing 
  a 
  dis- 
  

   tinct 
  mesial 
  depression. 
  

  

  Fig. 
  52. 
  A 
  large 
  imperfect 
  specimen, 
  intermediate 
  in 
  form 
  between 
  the 
  two 
  pre- 
  

   ceding, 
  and 
  with 
  more 
  distinctly 
  defined 
  mesial 
  fold. 
  

  

  Figs. 
  53, 
  54. 
  Dorsal 
  and 
  cardinal 
  views 
  of 
  a 
  specimen 
  similar 
  to 
  fig. 
  51, 
  enlarged, 
  

   showing 
  the 
  surface 
  characters, 
  and 
  (on 
  the 
  latter 
  figure) 
  the 
  

   denuded 
  space 
  on 
  the 
  beak 
  of 
  the 
  ventral 
  valve, 
  corresponding 
  to 
  

   the 
  foramen 
  in 
  other 
  genera. 
  

  

  These 
  figures 
  are 
  copied 
  from 
  the 
  Twentieth 
  Report 
  on 
  the 
  State 
  

   Cabinet 
  of 
  Natural 
  History, 
  page 
  275, 
  and 
  from 
  Pal. 
  JST. 
  ¥., 
  Vol. 
  

   IV, 
  Part 
  II 
  (unpublished). 
  

  

  

  