﻿230 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  Eurypterus 
  pachychirus 
  Hall 
  (1859. 
  Pal. 
  N. 
  Y. 
  3:412*, 
  pi. 
  82) 
  

   Distinguishing 
  characters. 
  Similar 
  toE. 
  robustus; 
  may 
  prove 
  

   identical. 
  Terminal 
  joints 
  of 
  the 
  sixth 
  pair 
  of 
  legs 
  very 
  broad. 
  

   Rare 
  in 
  the 
  Waterlime 
  at 
  North 
  Buffalo. 
  

  

  Eurypterus 
  dekayi 
  Hall 
  (1859. 
  Pal. 
  N. 
  Y. 
  3:411''', 
  pi. 
  82) 
  

   Distinguishing 
  characters. 
  Proportionally 
  short 
  body; 
  short 
  

   broad 
  carapace; 
  anterior 
  part 
  of 
  the 
  abdomen 
  very 
  broad, 
  posterior 
  

   part 
  much 
  contracted. 
  Penultimate 
  segment 
  with 
  elongate 
  lateral 
  

   flanges. 
  

  

  Occasionally 
  in 
  the 
  Waterlime 
  at 
  North 
  Buffalo. 
  

  

  Genus 
  dolichopterus 
  Hall 
  

   [Ety. 
  : 
  doMxo^, 
  long; 
  -zzpuv, 
  wing] 
  

  

  (1859. 
  Pa/. 
  A\ 
  7.3:414*) 
  

  

  Distinguished 
  from 
  Eurypterus 
  by 
  having 
  the 
  sixth 
  pair 
  of 
  

   cephalothoracic 
  legs 
  long 
  and 
  narrow, 
  with 
  the 
  last 
  two 
  joints 
  of 
  

   subequal 
  size. 
  Metastoma 
  elongate 
  heart-shaped, 
  as 
  in 
  P 
  t 
  e 
  r 
  y 
  - 
  

   g 
  o 
  t 
  u 
  s 
  . 
  

  

  Dolichopterus 
  macrochirus 
  Hall 
  (1859. 
  Pal. 
  N. 
  Y. 
  3:414*, 
  pi. 
  83, 
  

  

  83A) 
  

  

  Distinguishing 
  characters. 
  Robust, 
  elongated 
  body, 
  long, 
  straight- 
  

   sided 
  carapace, 
  very 
  anterior 
  eyes; 
  strong 
  and 
  thick 
  jointed 
  anterior 
  

   appendages; 
  extremely 
  long 
  sixth 
  pair 
  of 
  legs. 
  

  

  Found 
  in 
  the 
  WaterHme 
  beds 
  of 
  North 
  Buffalo. 
  

  

  Genus 
  eusarcus 
  Grote 
  & 
  Pitt 
  

  

  [Ety.: 
  el>, 
  well; 
  adp^, 
  flesh 
  (well-fleshed)] 
  

  

  (1875. 
  Buffalo 
  soc. 
  nat. 
  sci. 
  Bid. 
  3:1) 
  

  

  Eurypterids 
  with 
  the 
  anterior 
  six 
  abdominal 
  segments 
  greatly 
  

   expanded, 
  and 
  the 
  succeeding 
  ones 
  abruptly 
  contracted. 
  The 
  ter- 
  

   minal 
  joint 
  of 
  the 
  sixth 
  pair 
  of 
  legs 
  is 
  not 
  expanded. 
  

  

  Eusarcus 
  grandis 
  Grote 
  & 
  Pitt 
  {Buifalo 
  soc. 
  nat. 
  sci. 
  Bui. 
  3:17) 
  

   Distinguishing 
  characters. 
  Large 
  size, 
  attaining 
  a 
  length 
  of 
  2 
  or 
  3 
  

   feet. 
  Subcylindric 
  posterior 
  abdominal 
  segments. 
  

   In 
  the 
  Waterlime 
  at 
  North 
  Buffalo. 
  

  

  