﻿VITRINELLA. 
  Panama 
  Shells. 
  409 
  

  

  is 
  a. 
  keel, 
  wliicli 
  is 
  visible 
  on 
  a 
  small 
  part 
  of 
  the 
  penult 
  whorl, 
  

   and 
  then 
  runs 
  into 
  the 
  suture 
  ; 
  with 
  another 
  somewhat 
  less 
  

   prominent 
  keel 
  below 
  the 
  periphery, 
  aad 
  a 
  third, 
  which 
  is 
  

   nearly 
  obsolete, 
  around 
  the 
  umbilicus 
  ; 
  with 
  not 
  very 
  distinct 
  

   transverse 
  raised 
  lines, 
  which 
  are 
  most 
  developed 
  between 
  the 
  

   two 
  lower 
  keels 
  : 
  apex 
  obtuse 
  : 
  spire 
  convex, 
  slightly 
  elevated 
  : 
  

   whorls 
  nearly 
  three, 
  with 
  a 
  well 
  impressed 
  suture, 
  very 
  convex 
  

   above 
  so 
  as 
  to 
  simulate 
  a 
  moderately 
  developed 
  carina 
  ; 
  last 
  

   whorl 
  concave 
  on 
  each 
  side 
  of 
  the 
  periphery 
  : 
  aperture 
  orbi- 
  

   cular 
  : 
  labrum 
  slightly 
  thickened, 
  modified 
  by 
  the 
  ends 
  of 
  the 
  

   spiral 
  keels 
  ; 
  umbilicus 
  very 
  narrow, 
  deep. 
  

  

  Mean 
  divergence 
  about 
  170° 
  ; 
  greatest 
  breadth 
  .045 
  inch 
  ; 
  

   least 
  breadth 
  .036 
  inch 
  ; 
  height 
  .021 
  inch. 
  

  

  Station. 
  — 
  Unknown, 
  

  

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

  

  7 
  specimens 
  were 
  found 
  in 
  the 
  calcareous 
  sand. 
  

  

  260. 
  Vitrinella 
  Janus. 
  Nov. 
  sp. 
  

  

  Shell 
  subdiscoidal 
  : 
  white 
  : 
  with 
  four 
  very 
  narrow 
  acute 
  

   spiral 
  keels, 
  of 
  which 
  one 
  on 
  the 
  periphery 
  is 
  very 
  prominent, 
  

   another 
  a 
  little 
  below 
  the 
  periphery 
  is 
  less 
  prominent, 
  and 
  

   the 
  other 
  two, 
  on 
  the 
  middle 
  of 
  the 
  upper 
  and 
  lower 
  sides, 
  

   are 
  moderately 
  developed 
  ; 
  with 
  minute 
  spiral 
  striae 
  within 
  

   the 
  lower 
  keel 
  ; 
  otherwise 
  with 
  transverse 
  striae, 
  which 
  are 
  

   interrupted 
  by 
  the 
  keels 
  : 
  apex 
  prominent 
  ; 
  spire 
  moderately 
  

   elevated 
  : 
  whorls 
  three 
  and 
  one-third, 
  with 
  a 
  distinct 
  suture 
  : 
  

   aperture 
  orbicular, 
  very 
  oblique 
  : 
  lip 
  slightly 
  thickened, 
  angu- 
  

   lated 
  by 
  the 
  keels 
  : 
  umbilicus 
  deep. 
  

  

  Mean 
  divergence 
  160° 
  ; 
  greatest 
  breadth 
  .068 
  inch 
  ; 
  least 
  

   breadth 
  .06 
  inch 
  ; 
  height 
  .03 
  inch. 
  

  

  Station. 
  — 
  Unknown. 
  

  

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

   1 
  specimen 
  was 
  obtained. 
  

  

  JULY, 
  1852. 
  36 
  Ann. 
  Lyc. 
  Nat. 
  Hist, 
  

  

  