﻿C(KCUM. 
  Panama 
  Shells. 
  385 
  

  

  211. 
  Coecum 
  diminutnm. 
  Nov. 
  sp. 
  

  

  Shell 
  well 
  arcuated, 
  slender, 
  witli 
  the 
  diameter 
  uniform, 
  

   except 
  near 
  the 
  summit 
  : 
  white 
  : 
  with 
  about 
  17 
  stout 
  rings, 
  

   which 
  are 
  rather 
  distant 
  and 
  are 
  but 
  slightly 
  flattened 
  at 
  the 
  

   summits, 
  followed 
  by 
  about 
  10 
  rings 
  which 
  are 
  small 
  and 
  less 
  

   prominent 
  : 
  apex 
  lateral, 
  not 
  prominent. 
  

  

  Length 
  .06 
  inch 
  ; 
  breadth 
  .018 
  inch. 
  

  

  Station. 
  — 
  Unknown. 
  

  

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

   1 
  specimen 
  was 
  found. 
  

  

  212. 
  Coecum 
  eburneiiiu. 
  Nov. 
  sp. 
  

  

  Shell 
  rather 
  slender, 
  well 
  arcuated, 
  scarcely 
  widening 
  towards 
  

   the 
  aperture, 
  slightly 
  contracted 
  at 
  the 
  summit 
  : 
  ivory 
  white 
  : 
  

   with 
  about 
  33 
  broad 
  stout 
  approximate 
  rings 
  with 
  flat 
  summits 
  ; 
  

   with 
  the 
  first 
  4 
  to 
  10 
  rings 
  and 
  sometimes 
  the 
  last 
  2 
  or 
  3, 
  very 
  

   prominent 
  and 
  less 
  approximate, 
  and 
  the 
  rest 
  slightly 
  promi- 
  

   nent 
  and 
  closely 
  approximate 
  : 
  apex 
  prominent. 
  

  

  Length 
  .09 
  inch 
  ; 
  breadth 
  .025 
  inch. 
  

  

  A 
  var. 
  (?) 
  has 
  only 
  24 
  rings, 
  of 
  which 
  the 
  last 
  3 
  or 
  4 
  are 
  pro- 
  

   minent, 
  indicating 
  maturity. 
  

  

  Station. 
  — 
  Unknown. 
  

  

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

  

  22 
  specimens 
  were 
  found 
  in 
  the 
  sand, 
  

  

  213. 
  _€oBciim 
  firmatum. 
  Nov. 
  sp. 
  

  

  Shell 
  rather 
  stout, 
  well 
  arcuated, 
  widening 
  towards 
  the 
  aper- 
  

   ture, 
  moderately 
  contracted 
  at 
  the 
  summit 
  : 
  ivory 
  white 
  : 
  with 
  

   about 
  25 
  very 
  stout 
  broad 
  prominent 
  not 
  closely 
  approximate 
  

   rings, 
  with 
  flat 
  summits 
  : 
  apex 
  not 
  very 
  prominent. 
  

  

  Length 
  .09 
  inch 
  ; 
  breadth 
  .03 
  inch. 
  

  

  