﻿BucciNUM. 
  Panama 
  Shells. 
  291 
  

  

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

  

  More 
  than 
  500 
  specimens 
  were 
  collected, 
  all 
  occupied 
  by 
  

   hermit 
  crabs. 
  

  

  56 
  IVassa 
  "Wilsoiii. 
  — 
  Nov. 
  sp. 
  

  

  Shell 
  ovate 
  conic, 
  ventricose 
  : 
  blackish 
  brown, 
  with 
  a 
  dingy 
  

   white 
  spiral 
  band, 
  at 
  or 
  a 
  little 
  above 
  the 
  suture 
  : 
  with 
  six- 
  

   teen 
  to 
  twenty 
  small 
  ribs, 
  some 
  of 
  the 
  last 
  of 
  which 
  are 
  obso- 
  

   lete 
  on 
  the 
  convexity 
  of 
  the 
  whorl, 
  and 
  of 
  which 
  one 
  next 
  be- 
  

   hind 
  the 
  varix 
  is 
  larger 
  ; 
  with 
  many 
  spiral 
  raised 
  lines, 
  which 
  

   are 
  smaller 
  on 
  the 
  summits 
  of 
  the 
  ribs, 
  and 
  which 
  are 
  nearly 
  

   obsolete 
  in 
  the 
  region 
  where 
  the 
  ribs 
  are 
  obsolete 
  : 
  spire 
  with 
  

   the 
  outlines 
  curvilinear 
  : 
  apex 
  acute 
  : 
  whorls 
  seven, 
  slightly 
  

   convex, 
  with 
  a 
  distinct 
  suture 
  : 
  last 
  who;! 
  ventricose, 
  ante- 
  

   riorly 
  with 
  a 
  small 
  spiral 
  canal 
  : 
  aperture 
  suborbicular 
  : 
  labrum 
  

   subacute, 
  much 
  thickened 
  within 
  and 
  without, 
  with 
  a 
  few 
  

   sharp 
  ridges 
  within 
  : 
  labium 
  thickened, 
  not 
  appressed 
  : 
  notch 
  

   deep. 
  

  

  Mean 
  divergence 
  about 
  58° 
  ; 
  length 
  .32 
  inch 
  ; 
  breadth 
  .19 
  

   inch 
  ; 
  length 
  of 
  spire 
  .18 
  inch. 
  

  

  This 
  pretty 
  little 
  species 
  is 
  named 
  in 
  honor 
  of 
  Dr. 
  Thomas 
  

   B. 
  Wilson, 
  of 
  Philadelphia, 
  the 
  munificent 
  patron 
  and 
  success- 
  

   ful 
  cultivator 
  of 
  Natural 
  History. 
  

  

  Station. 
  — 
  Unknown. 
  

  

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

   5 
  specimens 
  were 
  obtained. 
  

  

  57. 
  Bucciniiiii 
  crassuui. 
  

  

  Synonymy. 
  

  

  Phos 
  crassus 
  Hinds 
  Voy. 
  Sulph. 
  Moll. 
  p. 
  38. 
  pi. 
  10. 
  f. 
  1, 
  2. 
  1844. 
  

  

  A. 
  Ad. 
  Ann. 
  and 
  Mag. 
  Nat. 
  Hist. 
  VHI. 
  No. 
  43. 
  

  

  p. 
  71. 
  July 
  1851. 
  

  

  