﻿OUMINGIA. 
  Panama 
  Shells, 
  511 
  

  

  striae 
  ; 
  in 
  the 
  lower 
  posterior 
  area 
  with 
  unequal 
  fine 
  raised 
  

   radiating 
  lines 
  ; 
  in 
  the 
  anterior 
  half 
  with 
  radiating 
  ribs, 
  which 
  

   are 
  ornamented 
  with 
  small 
  thick 
  vaulted 
  scales 
  ; 
  beaks 
  small, 
  

   prominent 
  : 
  umbones 
  prominent, 
  somewhat 
  flattened 
  : 
  lunule 
  

   defined 
  by 
  the 
  anterior 
  ribs, 
  a 
  little 
  depressed 
  : 
  ventral 
  margin 
  

   scalloped 
  anteriorly. 
  It 
  is 
  allied 
  to 
  P. 
  pholadiformis 
  Lam. 
  

   Length 
  .92 
  inch 
  ; 
  height 
  .42 
  inch; 
  breadth 
  .44 
  inch. 
  

  

  Station. 
  — 
  Unknown. 
  

  

  Habitat. 
  — 
  Panama; 
  C. 
  B. 
  A."! 
  

   1 
  specimen 
  was 
  obtained. 
  

  

  478. 
  l^axicaTa 
  tenuis 
  I 
  

  

  Synonymy. 
  

  

  Saxioava 
  tenuis 
  (?) 
  Sovvb. 
  in 
  Proe. 
  Zool. 
  Soc. 
  Lond. 
  p. 
  88. 
  Aug. 
  1834. 
  

  

  The 
  description 
  of 
  this 
  species 
  is 
  too 
  meagre 
  to 
  enable 
  us 
  to 
  

   identify 
  our 
  shell 
  confidently. 
  

  

  Station. 
  — 
  In 
  soft 
  stones 
  nea,r 
  half 
  tide 
  level. 
  

  

  Habitat. 
  — 
  Pacosmayo 
  and 
  Lambeyeque 
  ; 
  Cuming 
  ! 
  Sowerby. 
  

  

  Panama 
  ; 
  C. 
  B. 
  A. 
  ! 
  

   1 
  specimen 
  was 
  found 
  in 
  the 
  same 
  stone 
  with 
  Modiola, 
  sp, 
  

   indet. 
  e. 
  

  

  Family— 
  MACTEIDJE. 
  

  

  479. 
  Cuming^ia 
  coai*ctata« 
  

  

  Synonymy. 
  

  

  Cumingia 
  coarctata 
  Sowb. 
  Gen. 
  pi. 
  — 
  . 
  f. 
  4. 
  

  

  Sowb. 
  in 
  Proc. 
  Zool. 
  Soc. 
  Lond. 
  p. 
  34. 
  Mar. 
  1833. 
  

  

  Reeve 
  Conch. 
  Syst. 
  pi. 
  49. 
  f. 
  4. 
  Sept. 
  1841. 
  

  

  Hanley 
  Supp. 
  Wood 
  lud. 
  Test. 
  pi. 
  12. 
  f. 
  37. 
  1845 
  « 
  

  

  Station. 
  — 
  Sandy, 
  muddy 
  bottom, 
  7 
  fathoms 
  water 
  ; 
  Cuming 
  ! 
  

   Sowerby. 
  

  

  