﻿288 
  Panama 
  Shells. 
  purpurid^. 
  

  

  Habitat. 
  — 
  Atlantic 
  Ocean, 
  on 
  the 
  shores 
  of 
  Africa; 
  Kiener. 
  

   " 
  Bay 
  of 
  Montija, 
  West 
  Columbia 
  ;" 
  Cuming, 
  '. 
  

  

  Reeve. 
  

   Payta 
  ; 
  Petit 
  in 
  sched. 
  

   Taboga 
  and 
  Panama 
  ; 
  C. 
  B. 
  A. 
  ! 
  

   22 
  specimens 
  were 
  collected. 
  

  

  51. 
  Nassa 
  Panamensis.— 
  Nov. 
  sp. 
  

  

  Shell 
  long 
  ovate 
  conic 
  : 
  bluish 
  olivaceous, 
  with 
  a 
  whitish 
  

   spiral 
  line 
  below 
  the 
  middle 
  of 
  the 
  whorls 
  ; 
  colors 
  more 
  dis- 
  

   tinct 
  on 
  the 
  ribs 
  ; 
  whitish 
  near 
  the 
  upper 
  part 
  of 
  the 
  labrum 
  ; 
  

   anteriorly 
  with 
  a 
  pale 
  spiral 
  band, 
  which 
  is 
  sometimes 
  obso- 
  

   lete: 
  with, 
  on 
  each 
  whorl, 
  about 
  eleven 
  narrow 
  acute 
  ribs, 
  

   which 
  are 
  obsolete 
  anteriorly 
  ; 
  with 
  very 
  minute 
  spiral 
  striae, 
  

   which 
  are 
  less 
  distinct 
  below 
  the 
  middle 
  of 
  the 
  whorls 
  : 
  spire 
  

   with 
  the 
  outlines 
  moderately 
  curvilinear 
  : 
  apex 
  acute 
  : 
  whorls 
  

   eight, 
  slightly 
  convex, 
  with 
  a 
  distinct 
  suture 
  ; 
  last 
  whorl 
  not 
  

   ventricose 
  : 
  aperture 
  elliptical 
  ; 
  labrum 
  thickened 
  by 
  a 
  stout 
  

   varix 
  : 
  labium 
  thickened 
  but 
  not 
  appressed 
  : 
  notch 
  deep. 
  

  

  Mean 
  divergence 
  about 
  37°; 
  length 
  .58 
  mch; 
  breadth 
  .25 
  

   inch 
  ; 
  length 
  of 
  spire 
  .35 
  inch 
  

  

  Station. 
  — 
  Under 
  stones, 
  a 
  little 
  above 
  low 
  water 
  mark, 
  in 
  

   company 
  with 
  several 
  species 
  of 
  Columbella. 
  

  

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

  

  We 
  collected 
  about 
  1500 
  specimens 
  on 
  the 
  reef. 
  

  

  52. 
  ]\assa 
  proxiiMa.— 
  Nov. 
  sp. 
  

  

  i^Shell 
  like 
  that 
  of 
  N. 
  versicolor 
  (v. 
  infra), 
  but 
  much 
  more 
  

   slender, 
  with 
  the 
  ribs 
  less 
  prominent, 
  and 
  very 
  densely 
  covered 
  

   with 
  very 
  minute 
  uninterrupted 
  striae, 
  which 
  give 
  a 
  silky 
  

   lustre 
  to 
  the 
  surface. 
  

  

  Mean 
  divergence 
  about 
  38°; 
  length 
  .44 
  inch 
  ; 
  breadth 
  .21 
  

   inch 
  ; 
  length 
  of 
  spire 
  .28 
  inch. 
  

  

  