﻿510 
  Panama 
  Shells. 
  petricolid^. 
  

  

  a 
  tinge 
  of 
  blue 
  or 
  grey 
  ; 
  some 
  whitish 
  specimens 
  are 
  orna- 
  

   mented 
  with 
  bluish 
  purple 
  zigzag 
  lines 
  on 
  the 
  umbones, 
  or 
  

   Avith 
  a 
  short 
  ray 
  of 
  the 
  same 
  color 
  before 
  the 
  beaks 
  : 
  with 
  deep 
  

   unequal 
  crowded 
  concentric 
  striae 
  : 
  beaks 
  prominent 
  : 
  ligament 
  

   short, 
  conspicuous 
  : 
  lateral 
  teeth 
  rather 
  small. 
  This 
  species 
  is 
  

   closely 
  allied 
  to 
  T. 
  himaculata, 
  and 
  has 
  similar 
  varieties 
  of 
  color- 
  

   ing, 
  but 
  is 
  larger, 
  higher, 
  and 
  has 
  coarser 
  striae. 
  

   Length 
  .95 
  inch 
  ; 
  height 
  .78 
  inch 
  ; 
  breadth 
  .4 
  inch. 
  

  

  Station. 
  — 
  Unknown 
  . 
  

  

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

   10 
  specimens 
  were 
  collected. 
  

  

  474. 
  Tellilia 
  . 
  Sp. 
  indet. 
  a. 
  

  

  1 
  valve, 
  obtained 
  near 
  Panama, 
  resembles 
  an 
  overgrown 
  

   T. 
  elongata 
  Hanley, 
  which 
  species 
  Mr. 
  Cuming 
  found 
  at 
  Chiri- 
  

   qui 
  : 
  but 
  the 
  figure 
  of 
  that 
  species 
  in 
  Sowb. 
  Thes. 
  represents 
  

   the 
  umbonial 
  angles 
  as 
  concave 
  upwards, 
  but 
  in 
  this 
  shell 
  they 
  

   are 
  convex 
  upwards, 
  and 
  consequently 
  the 
  posterior 
  area 
  is 
  

   less. 
  Our 
  specimen 
  is 
  more 
  than 
  3 
  inches 
  long. 
  

  

  475. 
  Tellina 
  . 
  Sp. 
  indet. 
  b. 
  

  

  A 
  long 
  elliptic 
  plain 
  white 
  shell; 
  1 
  valve 
  was 
  found 
  near 
  

   Panama. 
  

  

  476. 
  Tellina 
  . 
  Sp. 
  indet. 
  c. 
  

  

  Like 
  T. 
  puella, 
  but 
  less 
  rostrate 
  and 
  more 
  deeply 
  striate 
  ; 
  5 
  

   odd 
  valves 
  were 
  found 
  near 
  Panama. 
  

  

  Family— 
  PETRICOLIDJE. 
  

   477. 
  Petricola 
  cog^nata. 
  Nov. 
  sp. 
  

  

  Shell 
  pholas-shaped, 
  inequilateral 
  : 
  dingy 
  white 
  : 
  in 
  the 
  

   upper 
  posterior 
  area 
  with 
  very 
  fine 
  crowded 
  radiating 
  equal 
  

  

  