﻿BQ$ 
  Panama 
  Shells,. 
  MURlcrD^; 
  

  

  Habitat. 
  — 
  Puerto 
  Portrero 
  and 
  Bay 
  of 
  Montija 
  in 
  Central 
  

   America 
  ; 
  Cuming 
  ! 
  Sowerby 
  : 
  also 
  Eeeve. 
  

   Panama 
  ; 
  C. 
  B. 
  A. 
  I 
  

  

  1 
  specimen 
  was 
  obtained 
  : 
  it 
  is 
  of 
  a 
  blacMsb 
  brown 
  eolor^ 
  but 
  

   otherwise 
  is 
  indistinguishable 
  from 
  a 
  specimen 
  received 
  from 
  

   Mr. 
  Cuming. 
  It 
  is 
  smaller 
  and 
  more 
  slender 
  and 
  finely 
  sculp- 
  

   tured 
  than 
  Mr. 
  Eeeve's 
  figure. 
  

  

  111. 
  Pleurotoma 
  excentrica? 
  

  

  Synonymy^ 
  

  

  Pleurotoma 
  excentrica 
  Sowb. 
  in 
  Proc. 
  Zool. 
  Soa. 
  Lond'. 
  

  

  p. 
  T38. 
  _ 
  . 
  - 
  - 
  Dee. 
  183S. 
  

  

  . 
  Mull. 
  Synop. 
  Nov. 
  Test. 
  Viv. 
  p. 
  115. 
  May 
  1836.. 
  

  

  ' 
  Reeve 
  Couch. 
  Icon. 
  pi. 
  1. 
  f. 
  58. 
  Mar. 
  1843. 
  

  

  Station.- 
  — 
  Coral 
  sand 
  at 
  the 
  depth 
  of 
  6 
  fathoms 
  ;. 
  Cuming 
  f. 
  

   Sowerby 
  : 
  also 
  Eeeve. 
  

  

  Habitat. 
  — 
  Gallapago 
  Is. 
  \ 
  Cuming 
  ! 
  Sowerby 
  : 
  also 
  Eeeve. 
  

   Panama 
  ; 
  C. 
  B* 
  A. 
  ! 
  

  

  We 
  found 
  1 
  specimen, 
  which 
  probably 
  belongs 
  to 
  this 
  species,. 
  

   It 
  is 
  a 
  little 
  longer 
  than 
  the 
  figure 
  in 
  the 
  Conch, 
  Icon,, 
  and 
  is 
  

   distorted 
  only 
  in 
  the 
  last 
  whorl 
  : 
  spiral 
  lines 
  cross 
  the 
  ribs 
  only 
  

   anteriorly. 
  

  

  172. 
  Pleiirotonia 
  exig^na. 
  Nov. 
  sp. 
  

  

  Shell' 
  slender 
  :. 
  pale 
  cream 
  color,, 
  with 
  very 
  fine 
  brown 
  spiral 
  

   lines, 
  of 
  which 
  the 
  two 
  or 
  three 
  upper 
  ones 
  are 
  single, 
  and 
  the 
  

   rest 
  are 
  in 
  pairs 
  : 
  with 
  distant 
  obtuse 
  transverse 
  ridges, 
  about 
  

   six 
  or 
  seven 
  on 
  each 
  whorl, 
  obsolete 
  on 
  the 
  anterior 
  half 
  of 
  the 
  

   last 
  whorl 
  : 
  apex 
  acute 
  :: 
  spire 
  with 
  the 
  outlines 
  moderately 
  

   convex 
  : 
  whorls 
  six, 
  convex, 
  with 
  a 
  distinct 
  suture 
  : 
  aperture- 
  

   narrow 
  : 
  labrum 
  thickened 
  by 
  the 
  last 
  ridge 
  a 
  little 
  behind 
  the 
  

   edge, 
  with 
  a 
  deep 
  sinus 
  near 
  the 
  suture 
  : 
  canal 
  very 
  short. 
  

  

  Mean 
  divergence 
  about 
  34° 
  ; 
  length 
  .175 
  inch 
  ; 
  breadth 
  ,06^ 
  

   inch 
  ; 
  length 
  of 
  spire 
  .1 
  inch.. 
  

  

  