﻿NASSA. 
  Panama 
  Shells. 
  289 
  

  

  Station. 
  — 
  Unknown. 
  

  

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

  

  One 
  specimen 
  was 
  obtained. 
  

  

  53. 
  IVassa 
  scabriui^cuEa 
  ? 
  

  

  Synonymy. 
  

   JVassa 
  scabriuscula 
  Powis 
  in 
  Proc. 
  Zool. 
  Soc. 
  Lond. 
  p. 
  96. 
  June. 
  1835. 
  

  

  Our 
  specimens 
  are 
  mostly 
  pale 
  olivaceous 
  or 
  glaucous, 
  with 
  

   the 
  granules, 
  upper 
  part 
  of 
  the 
  labrum, 
  and 
  a 
  spiral 
  stripe, 
  of 
  

   a 
  dingy 
  white. 
  Mr. 
  Powis 
  describes 
  his 
  shell 
  as 
  fusca 
  luteo 
  

   fasciata. 
  

  

  Var. 
  a 
  is 
  deeply 
  tinged 
  with 
  black, 
  and 
  has 
  some 
  pure 
  

   white 
  spots 
  at 
  the 
  upper 
  part 
  of 
  the 
  labrum. 
  

  

  Var. 
  b 
  is 
  black, 
  more 
  gibbous, 
  and 
  is 
  wholly 
  covered 
  with 
  

   granules. 
  

  

  Station. 
  — 
  Sandy 
  mud 
  at 
  a 
  depth 
  of 
  12 
  fathoms 
  ; 
  Cuming 
  ! 
  

   Powis. 
  

   Our 
  specimens 
  were 
  found 
  on 
  sand, 
  usually 
  not 
  far 
  below 
  

   high 
  water 
  mark, 
  where 
  water 
  runs 
  during 
  the 
  recess 
  of 
  the 
  

   tide; 
  also 
  in 
  similar 
  situations 
  near 
  low 
  water 
  mark. 
  

  

  Habitat. 
  — 
  Bay 
  of 
  Montija 
  ; 
  Cuming 
  ! 
  Powis. 
  

   Panama 
  ; 
  E. 
  Jewett 
  ! 
  Grould 
  Mss. 
  

   Panama 
  ; 
  C. 
  B. 
  A. 
  ! 
  

  

  "We 
  collected 
  380 
  specimens. 
  

  

  51. 
  rVassa 
  striata.— 
  Nov. 
  sp. 
  

  

  Shell 
  long 
  ovate 
  conic 
  : 
  white 
  about 
  the 
  aperture, 
  other- 
  

   wise 
  dingy 
  white 
  more 
  or 
  less 
  tinged 
  with 
  yellowish 
  brown 
  : 
  

   with, 
  on 
  each 
  whorl, 
  twelve 
  or 
  thirteen 
  small 
  ribs, 
  and 
  many 
  

   coarse 
  spiral 
  striae 
  : 
  spire 
  with 
  the 
  outlines 
  a 
  little 
  curvilinear: 
  

   apex 
  acute 
  : 
  whorls 
  eight, 
  convex, 
  with 
  a 
  well 
  impressed 
  su- 
  

  

  