﻿248 
  

  

  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  P. 
  s 
  c 
  u 
  t 
  e 
  1 
  1 
  a 
  

  

  Pisidium 
  ultramontanum 
  Prime 
  1865 
  (Fig. 
  182). 
  P. 
  ultra- 
  

   montanum 
  Prime 
  (1865. 
  Smith. 
  Misc. 
  coll. 
  no. 
  

  

  145. 
  P- 
  75) 
  

  

  Shell 
  solid, 
  oval 
  or 
  suborbicular, 
  and 
  remarkably 
  

   compressed; 
  anterior 
  side 
  much 
  produced 
  between 
  

   the 
  extremity 
  of 
  the 
  lateral 
  teeth 
  and 
  the 
  junction 
  with 
  

   the 
  basal 
  margin; 
  posterior 
  margin 
  well 
  rounded; 
  

   Fig. 
  183 
  Pisidium 
  beaks 
  small 
  and 
  only 
  slightly 
  raised 
  above 
  the 
  outline 
  

  

  ultramontanum. 
  x3 
  (. 
  . 
  111.1 
  . 
  • 
  r 
  1 
  j 
  . 
  1 
  

  

  of 
  the 
  shell; 
  the 
  striae 
  very 
  fine 
  and 
  even, 
  and 
  the 
  

   hinge 
  line 
  straight. 
  

  

  Locality. 
  Goat 
  island. 
  

  

  Pisidium 
  scutellatum 
  Sterki. 
  1896 
  (Fig. 
  183). 
  

   tum 
  Sterki 
  (1896. 
  Nautilus, 
  10:66) 
  

  

  Shell 
  high, 
  oblique, 
  slanting 
  downward 
  anteriorly, 
  

   well 
  rounded 
  and 
  rather 
  strongly 
  inflated; 
  beaks 
  pos- 
  

   terior, 
  rather 
  large 
  and 
  prominent, 
  margins 
  well 
  curved, 
  pj^ 
  jg3 
  p,gj. 
  

   the 
  surface 
  polished, 
  having 
  irregular 
  growth 
  lines 
  ; 
  the 
  f^^"^ 
  scuteiia- 
  

   hinge 
  line 
  and 
  short; 
  cardinal 
  teeth 
  lamellar, 
  the 
  one 
  in 
  

   the 
  right 
  valve 
  moderately 
  curved, 
  its 
  posterior 
  end 
  being 
  thickest; 
  

   the 
  inferior 
  in 
  the 
  left 
  valve 
  curved; 
  the 
  superior 
  almost 
  straight; 
  

   the 
  lateral 
  teeth 
  very 
  short, 
  abrupt, 
  pointed 
  and 
  thin, 
  projecting 
  

   somewhat 
  into 
  the 
  cavity 
  of 
  the 
  shell. 
  

  

  Locality. 
  Goat 
  island. 
  

  

  Genus 
  lampsilis 
  Rafinesque. 
  1820 
  

  

  Shell 
  inflated, 
  rather 
  thin, 
  and 
  shining, 
  sometimes 
  having 
  a 
  pos- 
  

   terior 
  ridge; 
  sculpture 
  coarse 
  at 
  beaks. 
  

  

  Lampsilis 
  rectus 
  (Lam.) 
  Smith 
  1899 
  (Fig. 
  184). 
  U 
  n 
  i 
  o 
  

  

  Fig. 
  181 
  Lampsilis 
  rectus 
  

  

  recta 
  Lamarck 
  (1819. 
  Animmix 
  sans 
  vcrtehres, 
  6:^4) 
  Lamp 
  

   silus 
  rectus 
  Smith 
  (1899. 
  U. 
  S. 
  fish 
  corn. 
  Bnl. 
  p. 
  290) 
  

  

  