﻿502 
  Panama 
  Shells. 
  tellenid.^. 
  

  

  Station. 
  — 
  Unknown, 
  

  

  Habitat. 
  — 
  Bay 
  of 
  Guayaquil, 
  and 
  of 
  Caraccas, 
  Chiriqui 
  ; 
  

   Cuming! 
  Hanley. 
  

   Panama 
  ; 
  C. 
  B. 
  A. 
  ! 
  

   20 
  odd 
  valves 
  were 
  taken 
  on 
  the 
  beach 
  west 
  of 
  Panama. 
  

  

  456. 
  JDonax 
  naTicula. 
  

  

  Synonymy. 
  

   Donax 
  navicula 
  Hanley 
  in 
  Proc. 
  Zool. 
  Soc. 
  Lond, 
  p. 
  15. 
  Feb. 
  1845- 
  

   Station 
  . 
  — 
  Unknown. 
  

  

  Habitat. 
  — 
  Gnlf 
  of 
  Nicoya 
  ; 
  Cuming 
  I 
  Hanley. 
  

  

  Panama 
  ; 
  E. 
  Jewett 
  ! 
  Gould 
  MSS. 
  

  

  Panama 
  ; 
  C. 
  B. 
  A. 
  ! 
  

   3 
  specimens 
  were 
  obtained. 
  

  

  457. 
  Donax 
  rosfratus. 
  Nov. 
  sp. 
  

  

  Shell 
  elongated, 
  inequilateral, 
  rostrated 
  anteriorly 
  ; 
  ventral 
  

   edge 
  excurved 
  along 
  the 
  middle, 
  anteriorly 
  rectilinear 
  ; 
  anterior 
  

   margin 
  very 
  oblique, 
  nearly 
  rectilinear, 
  forming 
  with 
  the 
  ventral 
  

   edge 
  a 
  rostriform 
  extremity 
  : 
  purple 
  and 
  dingy 
  yellowish 
  brown, 
  

   more 
  or 
  less 
  in 
  ill 
  defined 
  zones 
  ; 
  interior 
  with 
  the 
  same 
  colors 
  

   not 
  in 
  zones 
  : 
  posteriorly 
  and 
  near 
  the 
  beaks 
  smooth 
  and 
  shin- 
  

   ing 
  ; 
  with 
  rather 
  distant 
  very 
  fine 
  radiating 
  striae 
  over 
  the 
  

   middle 
  of 
  the 
  disc 
  ; 
  striae 
  coarser 
  anteriorly, 
  more 
  distant 
  next 
  

   behind 
  and 
  more 
  crowded 
  before 
  the 
  umbonial 
  angle 
  ; 
  the 
  latter 
  

   are 
  slightly 
  rugose 
  : 
  beaks 
  small, 
  prominent 
  : 
  umbones 
  pro- 
  

   minent 
  ; 
  with 
  a 
  very 
  sharp 
  angle 
  separating 
  a 
  concave 
  anterior 
  

   surface 
  ; 
  within 
  slightly 
  radiately 
  striated 
  ; 
  with 
  the 
  anterior 
  and 
  

   ventral 
  margins 
  crenulated, 
  more 
  coarsely 
  and 
  deeply 
  at 
  the 
  

   anterior 
  extremity 
  : 
  with 
  a 
  prominent 
  lateral 
  tooth 
  on 
  each 
  

   side 
  of 
  the 
  cardinal 
  teeth. 
  It 
  somewhat 
  resembles 
  D. 
  cardinatus 
  

   Hanley. 
  

  

  Length 
  1.6 
  inch 
  ; 
  height 
  1.15 
  inch 
  ; 
  breadth 
  .8 
  inch. 
  

  

  