﻿898 
  Panama 
  Shells. 
  littorinid^. 
  

  

  238. 
  liittoriiia 
  (?) 
  meg'asoiiia. 
  Nov. 
  sp. 
  

  

  Shell 
  obliquely 
  ovoid 
  : 
  dingy 
  white 
  : 
  with 
  eight 
  or 
  nine 
  small 
  

   spiral 
  ridges, 
  of 
  which 
  three 
  are 
  seen 
  on 
  the 
  spire 
  ; 
  with 
  very 
  

   coarse 
  deep 
  regular 
  transverse 
  striae 
  : 
  apex 
  acute 
  : 
  spire 
  very 
  

   small, 
  with 
  the 
  outlines 
  nearly 
  rectilinear 
  : 
  whorls 
  three, 
  angu- 
  

   lar, 
  with 
  an 
  excavated 
  suture 
  : 
  last 
  whorl 
  very 
  large 
  and 
  

   obliquely 
  dilated 
  : 
  aperture 
  subelliptical, 
  with 
  the 
  margin 
  con- 
  

   tinuous 
  and 
  thin 
  : 
  umbilical 
  region 
  well 
  defined 
  by 
  the 
  ante- 
  

   rior 
  spiral 
  ridge, 
  well 
  excavated, 
  and 
  forming 
  with 
  the 
  umbihcus 
  

   a 
  funnel-shaped 
  pit. 
  

  

  Mean 
  divergence 
  about 
  185° 
  ; 
  length 
  .09 
  inch 
  ; 
  breadth 
  .09 
  

   Sich 
  ; 
  length 
  of 
  spire 
  .035 
  inch. 
  

  

  This 
  species 
  also 
  is 
  referred 
  to 
  Littorina 
  with 
  much 
  hesitation 
  : 
  

   it 
  approaches 
  Narica 
  more 
  nearly 
  than 
  any 
  of 
  the 
  species 
  which 
  

   we 
  have 
  mentioned 
  as 
  resembling 
  that 
  genus. 
  

  

  Station. 
  — 
  Unknown. 
  

  

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

  

  1 
  specimen 
  was 
  found 
  in 
  the 
  sand. 
  

  

  239. 
  liittorma 
  parTula? 
  

  

  Synonymy. 
  

  

  ? 
  Littorina 
  2Mrvula 
  Phil, 
  in 
  Zeitsclir. 
  Malak. 
  vol. 
  for 
  1848. 
  

  

  p. 
  149. 
  March 
  1849. 
  

  

  If 
  our 
  shell 
  is 
  distinct 
  from 
  Philippi's 
  species, 
  it 
  may 
  take 
  

   the 
  name 
  of 
  L. 
  dubiosa, 
  with 
  the 
  following 
  description. 
  

  

  Shell 
  conoid 
  : 
  blue, 
  whitish 
  next 
  below 
  the 
  suture 
  and 
  an- 
  

   teriorly, 
  with 
  oblique 
  brown 
  bars 
  on 
  the 
  whitish 
  parts 
  ; 
  very 
  

   dark 
  brown 
  inside, 
  spotted 
  with 
  brown 
  and 
  white 
  in 
  the 
  labrum 
  : 
  

   with 
  several 
  impressed 
  spiral 
  lines, 
  which 
  are 
  more 
  or 
  less 
  indis- 
  

   tinct 
  on 
  the 
  spire 
  and 
  on 
  the 
  middle 
  of 
  the 
  last 
  whorl, 
  and 
  of 
  

   which 
  one 
  next 
  above 
  the 
  angle 
  of 
  the 
  last 
  whorl 
  is 
  deeper 
  : 
  

   apex 
  subacute 
  : 
  spire 
  with 
  the 
  outlines 
  moderately 
  curvilinear 
  : 
  

  

  