﻿512 
  Panama 
  Shells. 
  MACTRID^. 
  

  

  Habitat. 
  — 
  Bay 
  of 
  Caraccas 
  ; 
  Cuming 
  ! 
  Sowerby. 
  

  

  Panama 
  ; 
  C. 
  B. 
  A. 
  I 
  

   4 
  specimens 
  were 
  obtained. 
  

  

  480. 
  Cumin^ia 
  tri^onularis. 
  

  

  Synonymy. 
  

  

  Cumingia 
  trigonularis 
  Sowb. 
  in 
  Proc.Zool, 
  Soc. 
  Lond. 
  p. 
  35. 
  Mar. 
  1833. 
  

  

  ^ 
  Sowb. 
  Gen. 
  pi. 
  — 
  . 
  f. 
  2. 
  

  

  Reeve 
  Concb. 
  Syst. 
  pi. 
  49. 
  f. 
  2. 
  Sept. 
  1841.. 
  

  

  Station. 
  — 
  Among 
  stones 
  in 
  deep 
  water 
  ; 
  Cuming 
  ! 
  Sowerby, 
  

  

  Habitat. 
  — 
  St. 
  Elena 
  r 
  Cuming 
  ! 
  Sowerby.- 
  

   Panama 
  ; 
  C. 
  B. 
  A. 
  I 
  

  

  3 
  specimens 
  were 
  found. 
  

  

  481. 
  Climillg^ia 
  . 
  Sp. 
  indet. 
  a. 
  

  

  4 
  specimens 
  were 
  obtained 
  near 
  Panama. 
  

  

  482. 
  Cuming'ia 
  • 
  Sp. 
  indet. 
  6. 
  

  

  1 
  specimen 
  was 
  obtained 
  near 
  Panama. 
  

  

  483. 
  Cuming^ia 
  , 
  Sp. 
  indet. 
  c. 
  

  

  1 
  valve 
  was 
  foand 
  near 
  Panama. 
  

  

  484. 
  Cuming'ia 
  . 
  Sp, 
  indet. 
  d^ 
  

  

  1 
  specimen 
  was 
  found 
  near 
  Panama. 
  

  

  The 
  above 
  are 
  probably 
  new 
  species 
  of 
  Cumingia; 
  but 
  as 
  

   their 
  characters 
  are 
  probably 
  somewhat 
  variable, 
  more 
  speci- 
  

   mens 
  are 
  requisite 
  for 
  good 
  descriptions. 
  

  

  485. 
  Ampliidesma 
  bicolor. 
  Nov. 
  sp. 
  

  

  Shell 
  elliptical, 
  scarcely 
  flexuous, 
  inequilateral, 
  the 
  posterior 
  

   side 
  being 
  larger 
  ; 
  with 
  the 
  posterior 
  dorsal 
  margin 
  a 
  little 
  con- 
  

  

  