﻿264 
  Panama 
  Shells. 
  cYPRiEiD-E. 
  

  

  Kiener's 
  figure 
  represents 
  a 
  mature 
  specimen, 
  probably 
  not 
  an 
  

   old 
  one, 
  with 
  the 
  columellar 
  teeth 
  not 
  fully 
  developed. 
  "We 
  

   are 
  indebted 
  to 
  Mr. 
  Red 
  field 
  for 
  the 
  gift 
  of 
  his 
  best 
  specimen, 
  

   which 
  appears 
  to 
  be 
  full 
  grown 
  and 
  perfect 
  without 
  the 
  pus- 
  

   tulous 
  surface. 
  Col. 
  Jewett 
  also 
  collected 
  several 
  specimens 
  

   of 
  the 
  same 
  variety 
  at 
  Mazatlan. 
  Perhaps 
  the 
  acquisition 
  of 
  

   this 
  character 
  is 
  the 
  last 
  change 
  which 
  the 
  shell 
  undergoes. 
  

  

  14. 
  Marg'iiaelfla 
  minor. 
  Nov. 
  sp. 
  

  

  Shell 
  ovate 
  : 
  white, 
  or 
  pale 
  horn 
  color, 
  subtransparent 
  ; 
  

   rather 
  thin, 
  smooth 
  : 
  spire 
  slightly 
  elevated 
  : 
  whorls 
  about 
  

   three 
  (?) 
  with 
  a 
  very 
  indistinct 
  suture 
  : 
  aperture 
  linear 
  : 
  lip 
  

   rather 
  thin 
  at 
  the 
  margin, 
  thickened 
  behind, 
  posteriorly 
  as- 
  

   scending 
  the 
  spire 
  : 
  columella 
  with 
  two 
  well 
  developed 
  plaits 
  

   at 
  the 
  end, 
  with 
  a 
  third 
  one 
  less 
  developed, 
  and 
  sometimes 
  

   with 
  a 
  fourth 
  which 
  is 
  more 
  or 
  less 
  indistinct. 
  Length, 
  .09 
  

   inch 
  : 
  breadth, 
  .063 
  inch 
  : 
  some 
  of 
  our 
  specimens, 
  which 
  ap- 
  

   pear 
  to 
  be 
  full 
  grown, 
  are 
  much 
  smaller. 
  

  

  This 
  little 
  shell 
  closely 
  resembles 
  the 
  Caribbean 
  species, 
  

   M. 
  Lavalleana 
  Orb. 
  (M. 
  minima 
  Gruild,): 
  the 
  most 
  obvious 
  

   difference 
  is 
  in 
  the 
  outline, 
  which 
  in 
  the 
  Caribbean 
  species 
  is 
  

   broader 
  across 
  the 
  upper 
  part 
  of 
  the 
  last 
  whorl, 
  the 
  lip 
  conse- 
  

   quently 
  being, 
  at 
  this 
  part, 
  more 
  excurved. 
  

  

  Station. 
  — 
  Unknown. 
  

  

  Habitat. 
  — 
  Panama 
  ; 
  C. 
  B. 
  A 
  ! 
  

  

  We 
  obtained 
  10 
  more 
  or 
  less 
  perfect 
  specimens 
  from 
  the 
  

   calcareous 
  sand, 
  which 
  had 
  been 
  washed 
  up 
  near 
  the 
  sea 
  wall 
  

   of 
  Panama. 
  

  

  15. 
  Mar^iiiclla 
  sapotilla. 
  

  

  Synonymy. 
  

  

  Marginella 
  sapotilla 
  Hinds 
  in 
  Proc. 
  Zool. 
  See. 
  Loud. 
  p. 
  74. 
  April, 
  1844. 
  

  

  Hinds 
  inVoy. 
  Sulph. 
  Moll. 
  pi. 
  13.f. 
  10, 
  11. 
  1844. 
  

  

  , 
  Thes. 
  Conch, 
  p. 
  383. 
  No 
  39. 
  pi. 
  77. 
  f. 
  150-1. 
  1846. 
  

  

  