﻿204 
  

  

  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  Fig. 
  128 
  Whitfleldella 
  sulcata 
  x 
  1)4 
  

  

  faint 
  mesial 
  depression 
  in 
  pedicle 
  valve; 
  slight 
  frontal 
  sinuosity; 
  fine 
  

   radiating 
  striae 
  near 
  the 
  front. 
  

  

  Found 
  in 
  the 
  upper 
  Clinton 
  Hmestone 
  at 
  

  

  Lockport 
  (Hall). 
  Probably 
  also 
  at 
  Niagara. 
  

  

  Whitfleldella 
  sulcata 
  (Vanuxem) 
  (Fig. 
  

  

  128) 
  (Grabau. 
  Geol. 
  soc. 
  Am. 
  Bui. 
  1 
  1 
  :367, 
  

  

  pi. 
  22) 
  

  

  Distinguishing 
  characters. 
  Ventricose, 
  

   elongate; 
  well 
  marked 
  sinus 
  in 
  both 
  valves; 
  

   lines 
  of 
  growth 
  and 
  prominent 
  wrinkles 
  

   and 
  changes 
  in 
  direction 
  of 
  growth. 
  

   Found 
  in 
  the 
  Manlius 
  limestone 
  of 
  North 
  Buffalo, 
  etc. 
  

   Whitfleldella 
  rotundata 
  (Whitfield) 
  (Fig. 
  

   129) 
  (Grabau. 
  Geol. 
  soc. 
  Am. 
  Bui. 
  11:368, 
  

   pi. 
  22) 
  

  

  Distinguishing 
  characters. 
  Small, 
  subcir- 
  

   cular 
  ; 
  moderately 
  convex 
  ; 
  beak 
  curved 
  at 
  Fig. 
  129 
  whitfieweiia 
  rotundata 
  

  

  X 
  11^ 
  

  

  right 
  angles 
  to 
  plane 
  of 
  contact 
  of 
  valves. 
  

  

  Found 
  in 
  the 
  Manlius 
  limestone 
  of 
  Erie 
  county 
  (N. 
  Y.) 
  

  

  Whitfleldella 
  laevis 
  (Whitfield) 
  (Fig. 
  

   130) 
  (Grabau. 
  Geol. 
  soc. 
  Am. 
  Bui. 
  

   1 
  1 
  1369, 
  pi. 
  22) 
  

  

  Distinguishing 
  characters. 
  Small; 
  broad- 
  

   ly 
  ovoid; 
  moderately 
  gibbous, 
  greatest 
  

   gibbosity 
  in 
  posterior 
  third; 
  faint 
  mesial 
  

   depression. 
  

  

  Found 
  in 
  the 
  Manlius 
  limestone 
  of 
  Erie 
  

  

  rig. 
  130 
  Whitfleldella 
  laevis 
  x 
  13^ 
  cOUUtV 
  (N 
  Y 
  ) 
  

  

  Genus 
  hyattella 
  Hall 
  & 
  Clarke 
  

  

  [Ety. 
  : 
  proper 
  name] 
  

  

  (1893. 
  Pal. 
  N. 
  Y. 
  V. 
  8, 
  pt 
  2, 
  p. 
  61) 
  

  

  Shell 
  similar 
  to 
  Whitfieldella, 
  but 
  compactly 
  subpenta- 
  

   hedral, 
  and 
  without 
  the 
  median 
  septum 
  in 
  the 
  brachial 
  valve. 
  

  

  Hyattella 
  congesta 
  (Conrad) 
  (Fig. 
  131 
  and 
  131a). 
  Atrypa 
  

   congesta 
  Hall 
  (1852. 
  Pal. 
  N. 
  Y. 
  2:67, 
  pi. 
  23); 
  Atrypa 
  

   quadricostata 
  Hall 
  (Pal. 
  N. 
  Y. 
  2 
  :68, 
  pi. 
  23) 
  

  

  