﻿160 
  Twenty-eighth 
  Eepoet 
  on 
  the 
  State 
  Museum. 
  

  

  Meristina 
  nitida. 
  

  

  Plate 
  25, 
  Figs. 
  1-7. 
  

  

  Atrypa 
  nitida 
  Hall. 
  Geol. 
  of 
  N. 
  Y. 
  Surv. 
  4th 
  Geolog. 
  Dist. 
  Tab. 
  of 
  Organic 
  

  

  Remains, 
  p. 
  11, 
  no. 
  14 
  (no. 
  13 
  on 
  plate), 
  fig. 
  5. 
  1848. 
  

   Atrypa 
  nitida 
  Hall. 
  Pal. 
  N. 
  Y., 
  vol. 
  ii, 
  p. 
  268, 
  pi. 
  55, 
  figs. 
  1 
  a-lo. 
  1852. 
  

   Merista 
  nitida 
  Hall. 
  12th 
  Report 
  State 
  Cab. 
  Nat. 
  Hist., 
  p. 
  78. 
  1859. 
  

   Meriste.Ua 
  nitida 
  Hall. 
  Trans. 
  Alb. 
  Inst., 
  vol. 
  iv, 
  p. 
  226. 
  Abstract 
  p. 
  32; 
  May, 
  

  

  1863. 
  

   Meristina 
  nitida 
  Hall. 
  Pal. 
  N. 
  Y., 
  vol. 
  iv, 
  p. 
  299. 
  1867. 
  

  

  This 
  species 
  is 
  very 
  abundant 
  and 
  variable 
  in 
  character, 
  

   and 
  much 
  larger 
  than 
  the 
  New 
  York 
  specimens 
  of 
  this 
  shell. 
  

   The 
  form 
  varies 
  from 
  narrow 
  ovate 
  and 
  very 
  ventricose 
  to 
  

   broadly 
  rhomboid 
  ovate 
  and 
  strongly 
  emarginate 
  in 
  front. 
  

  

  JSrUCLEOSPIRA 
  Rail 
  

  

  NUCLEOSPIRA 
  PISIEORMIS. 
  

  

  Plate 
  25, 
  Figs. 
  22-28. 
  

  

  Orthis 
  pisum 
  (Mttrch.) 
  Hall. 
  Pal. 
  N. 
  Y., 
  vol. 
  ii, 
  p. 
  250, 
  pi. 
  52, 
  figs. 
  1 
  a-1 
  e. 
  1852. 
  

   Nucleospira 
  piriformis 
  Hall. 
  Pal. 
  N. 
  Y., 
  vol. 
  iii, 
  Expl. 
  pi. 
  28 
  B. 
  1859. 
  

   Nucleospira 
  piriformis 
  JIaUj 
  . 
  Trans. 
  Alb. 
  Inst., 
  vol. 
  iv, 
  p. 
  226. 
  Abstract, 
  p. 
  32; 
  

   May, 
  1863. 
  

  

  This 
  species 
  is 
  common. 
  Many 
  of 
  the 
  specimens 
  are 
  almost 
  

   entirely 
  covered 
  with 
  long 
  fine 
  setae 
  projecting 
  beyond 
  the 
  

   margins, 
  forming 
  a 
  marginal 
  fringe. 
  

  

  RETZIA 
  King. 
  

   Retzia 
  eyax. 
  

  

  Plate 
  25, 
  Figs. 
  13-21. 
  

  

  Rhynchospira 
  evax 
  Hall. 
  Trans. 
  Alb. 
  Inst., 
  vol. 
  iv, 
  p. 
  213. 
  Abstract' 
  p. 
  19; 
  

   May, 
  1863. 
  

  

  Shell 
  ovate, 
  often 
  broadly 
  ovate, 
  usually 
  longer 
  than 
  wide, 
  

   sometimes 
  much 
  longer 
  ; 
  both 
  valves 
  gibbous 
  in 
  the 
  middle 
  

   and 
  upper 
  part, 
  ventral 
  valve 
  a 
  little 
  deeper 
  than 
  the 
  opposite 
  , 
  

   both 
  valves 
  sometimes 
  marked 
  b}^ 
  a 
  shallow 
  undefined 
  sinus, 
  

   causing 
  an 
  emargination 
  in 
  front. 
  Ventral 
  beak 
  much 
  ele- 
  

   vated 
  above 
  the 
  other, 
  and 
  incurved, 
  so 
  as 
  to 
  bring 
  the 
  plane 
  

   of 
  the 
  foramen 
  parallel 
  to 
  the 
  axis 
  of 
  the 
  shell 
  ; 
  foramen 
  dis- 
  

  

  