﻿66 
  New 
  Species 
  of 
  Stoastoma. 
  

  

  color, 
  subtransparent 
  : 
  with 
  five 
  spiral 
  carinae, 
  one 
  of 
  which 
  is 
  

   visible 
  on 
  the 
  spire 
  ; 
  with 
  very 
  delicate 
  spiral 
  raised 
  lines, 
  

   usually 
  three 
  to 
  six 
  in 
  each 
  interspace 
  : 
  spire 
  moderately 
  ele- 
  

   vated 
  convex 
  : 
  whorls 
  three 
  and 
  one-half, 
  moderately 
  convex, 
  

   subangular 
  ; 
  with 
  a 
  well 
  impressed 
  suture 
  ; 
  last 
  whorl 
  scarce- 
  

   ly 
  detached 
  from 
  the 
  penult 
  whorl 
  at 
  the 
  aperture 
  : 
  aperture 
  

   rather 
  large, 
  slightly 
  constricted 
  behind 
  the 
  lip, 
  which 
  is 
  mod- 
  

   erately 
  produced, 
  above 
  not 
  very 
  abruptly 
  produced, 
  scarcely 
  

   modified 
  by 
  the 
  carinae 
  ; 
  labium 
  well 
  detached 
  from 
  the 
  pe- 
  

   nult 
  whorl, 
  scarcely 
  reflected 
  : 
  umbilicus 
  rather 
  wide, 
  with 
  

   the 
  spiral 
  lamella 
  moderately 
  developed. 
  Operculum 
  deeply 
  

   concave, 
  subauriculate, 
  smooth. 
  

  

  Mean 
  divergence 
  about 
  145° 
  ; 
  height 
  .035 
  inch 
  ; 
  greatest 
  

   breadth 
  .065 
  inch 
  ; 
  least 
  breadth 
  .055 
  inch. 
  

  

  This 
  species 
  much 
  resembles 
  the 
  preceding. 
  It 
  is 
  most 
  

   readily 
  distinguished 
  by 
  its 
  inferior 
  size, 
  and 
  by 
  the 
  greater 
  

   number 
  of 
  fine 
  spiral 
  striae. 
  

  

  Stoastoma 
  Moricandianum. 
  Shell 
  globose 
  conic 
  ; 
  horn 
  

   color, 
  or 
  very 
  pale 
  yellowish 
  green 
  : 
  with 
  numerous 
  very 
  fine 
  

   somewhat 
  tortuous 
  raised 
  spiral 
  lines, 
  of 
  which 
  three 
  or 
  four 
  

   are 
  visible 
  on 
  the 
  spire 
  ; 
  and 
  two 
  or 
  three 
  still 
  more 
  minute 
  

   lines 
  in 
  each 
  interspace 
  ; 
  but 
  in 
  some, 
  all 
  the 
  lines 
  are 
  nearly 
  

   equal 
  : 
  spire 
  well 
  elevated, 
  with 
  the 
  outlines 
  nearly 
  rectilinear 
  : 
  

   whorls 
  four, 
  quite 
  convex, 
  with 
  a 
  well 
  impressed 
  suture 
  ; 
  last 
  

   whorl 
  subglobose 
  : 
  aperture 
  rather 
  larger 
  than 
  a 
  semicircle, 
  a 
  

   little 
  campanulate 
  : 
  labrum 
  moderately 
  and 
  above 
  not 
  abrupt- 
  

   ly 
  produced, 
  scarcely 
  modified 
  by 
  the 
  larger 
  spiral 
  lines 
  : 
  labi- 
  

   um 
  moderately 
  detached 
  from 
  the 
  penult 
  whorl, 
  slightly 
  curved 
  

   and 
  reflected 
  : 
  umbilicus 
  narrow, 
  with 
  the 
  spiral 
  lamella 
  very 
  

   small. 
  Operculum 
  rather 
  deeply 
  concave, 
  subauriculate, 
  very 
  

   finely 
  papillose. 
  

  

  Mean 
  divergence 
  about 
  85° 
  ; 
  height 
  .075 
  inch 
  ; 
  greatest 
  

   breadth 
  .085 
  inch 
  ; 
  least 
  breadth 
  .075 
  inch. 
  

  

  