﻿410 
  Panama 
  Shells. 
  TROCHID^. 
  

  

  261. 
  Vitrinella 
  miniita. 
  Nov. 
  sp. 
  

  

  Shell 
  discoidal 
  : 
  dingy 
  white, 
  shining 
  : 
  with 
  excessively 
  

   minute 
  transverse 
  strife 
  : 
  apex 
  obtuse 
  : 
  spire 
  scarcely 
  elevated 
  : 
  

   whorls 
  nearly 
  three, 
  depressed 
  above, 
  with 
  a 
  well 
  impressed 
  

   suture 
  ; 
  last 
  whorl 
  much 
  depressed, 
  subangular 
  at 
  the 
  periphery 
  : 
  

   aperture 
  rather 
  large, 
  orbicular 
  : 
  labrum 
  slightly 
  thickened 
  : 
  

   umbilicus 
  rather 
  deep, 
  nearly 
  covered. 
  

  

  Mean 
  divergence 
  about 
  170° 
  ; 
  greatest 
  breadth 
  .042 
  inch 
  ; 
  

   least 
  breadth 
  .036 
  inch 
  ; 
  height 
  .017 
  inch. 
  

  

  Station. 
  — 
  Unknown. 
  

  

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

  

  4 
  specimens 
  were 
  found 
  in 
  the 
  calcareous 
  sand. 
  

  

  262. 
  Vitrinella 
  modesta. 
  Nov. 
  sp. 
  

  

  Shell 
  discoidal 
  : 
  dingy 
  white, 
  translucent 
  : 
  with 
  a 
  spiral 
  

   elevated 
  line 
  next 
  below 
  the 
  suture, 
  and 
  a 
  spiral 
  keel 
  around 
  

   the 
  umbilicus 
  ; 
  with 
  few 
  microscopic 
  spiral 
  striae 
  about 
  the 
  

   periphery 
  of 
  the 
  last 
  whorl 
  : 
  apex 
  not 
  prominent 
  : 
  spire 
  a 
  little 
  

   elevated 
  and 
  regularly 
  convex 
  : 
  whorls 
  three 
  and 
  one-half, 
  with 
  

   the 
  suture 
  distinct 
  : 
  aperture 
  orbicular 
  : 
  umbilicus 
  deep. 
  

  

  Mean 
  divergence 
  170° 
  : 
  greatest 
  breadth 
  .06 
  inch 
  ; 
  least 
  

   breadth 
  .05 
  inch 
  ; 
  height 
  .028 
  inch. 
  

  

  Station. 
  — 
  Unknown. 
  

  

  Habitat 
  — 
  Panama 
  ; 
  C. 
  B. 
  A. 
  ! 
  

   1 
  specimen 
  was 
  obtained. 
  

  

  263. 
  Vitrinella 
  Panamensis. 
  Nov. 
  sp. 
  

  

  Shell 
  subdiscoidal 
  : 
  white 
  : 
  with 
  a 
  stout 
  spiral 
  keel 
  on 
  each 
  

   side 
  of 
  the 
  periphery 
  of 
  the 
  last 
  whorl, 
  and 
  two 
  others 
  on 
  the 
  

   lower 
  side 
  of 
  the 
  shell, 
  of 
  which 
  one 
  next 
  to 
  the 
  umbilicus 
  is 
  

   shghtly 
  prominent 
  ; 
  with 
  transverse 
  rather 
  distant 
  curved 
  ribs 
  : 
  

   apex 
  obtuse 
  : 
  spire 
  convex, 
  but 
  little 
  elevated 
  : 
  whorls 
  a 
  little 
  

  

  