﻿450 
  Panama 
  Shells. 
  CALYPTR^id^. 
  

  

  the 
  middle, 
  with 
  a 
  small 
  sinus 
  at 
  the 
  left, 
  a 
  broad 
  one 
  at 
  the 
  

   middle 
  of 
  the 
  edge, 
  and 
  none 
  at 
  the 
  right 
  side. 
  

  

  Length 
  .23 
  inch 
  : 
  breadth 
  .14 
  inch 
  ; 
  convexity 
  .07 
  inch. 
  

  

  Station. 
  — 
  On 
  Cerithium 
  trroratum, 
  q. 
  v. 
  

  

  Rahitat.—Tahoga 
  ; 
  C. 
  B. 
  A. 
  ! 
  

  

  This 
  species 
  was 
  not 
  observed 
  until 
  after 
  the 
  shells 
  arrived 
  

   here. 
  When 
  cleaning 
  a 
  quantity 
  of 
  C. 
  trroratum, 
  45 
  specimens 
  

   were 
  obtained. 
  

  

  844. 
  Crepidtila 
  echinus. 
  

  

  Synonymy. 
  

  

  Cali/pt}-cea 
  [Crepijpatelta) 
  echinus 
  Brod. 
  in 
  Proc. 
  Zool. 
  Soc. 
  

  

  Lond. 
  p. 
  39. 
  - 
  - 
  May 
  1834. 
  

   Brod. 
  in 
  Trans. 
  Zool. 
  Soc. 
  

  

  Lond. 
  I. 
  203. 
  pi. 
  27. 
  f. 
  1. 
  1835. 
  

   Mull. 
  Synop. 
  Nov. 
  Test. 
  

  

  Viv. 
  p. 
  148. 
  - 
  - 
  May 
  1836. 
  

   Crepidula 
  Lam. 
  An. 
  sans 
  Vert. 
  VIL 
  

  

  650. 
  No. 
  23. 
  (Desh. 
  ed.) 
  1838. 
  

   Lam. 
  An. 
  sans 
  Vert. 
  IIL 
  

  

  Pt. 
  1. 
  p. 
  239, 
  No. 
  23. 
  

  

  (Desh. 
  ed. 
  tert.) 
  - 
  - 
  1841. 
  

  

  Station. 
  — 
  Under 
  stones 
  at 
  low 
  water. 
  

  

  Habitat. 
  — 
  Lobos 
  I. 
  ; 
  Cuming 
  ! 
  Broderip 
  : 
  also 
  Miiller. 
  

  

  Peru 
  ; 
  Deshayes 
  : 
  also 
  Jay. 
  

  

  Panama 
  ; 
  C. 
  B. 
  A 
  ! 
  

   18 
  specimens 
  were 
  obtained. 
  

  

  345. 
  Crepidula 
  excavata. 
  

  

  Synonymy. 
  

  

  CalyptrcBa 
  {^Crepidula) 
  excavata 
  Brod. 
  in 
  Proc. 
  Zool. 
  Soc. 
  

  

  Lond. 
  p. 
  40. 
  - 
  - 
  May 
  1834. 
  

   Brod. 
  in 
  Trans. 
  Zool. 
  Soc. 
  

  

  Lond. 
  L 
  205. 
  pi. 
  29. 
  f. 
  1. 
  1835. 
  

  

  