﻿886 
  Panama 
  Shells. 
  littorinid^. 
  

  

  A 
  variety 
  (?) 
  is 
  more 
  slender, 
  and 
  has 
  the 
  ribs 
  less 
  pro- 
  

   minent. 
  

   Station. 
  — 
  Unknown. 
  

  

  Habitat. 
  — 
  Panama 
  ; 
  C 
  B. 
  A. 
  ! 
  

  

  85 
  specimens 
  were 
  collected 
  from 
  the 
  sand. 
  

  

  214. 
  CcBcuni 
  laeve. 
  Nov. 
  sp. 
  

  

  Shell 
  well 
  arcuated, 
  rather 
  stout, 
  of 
  nearly 
  uniform 
  diameter 
  : 
  

   white 
  : 
  smooth 
  and 
  shining 
  : 
  apex 
  very 
  prominent. 
  

   Length 
  .08 
  inch 
  ; 
  breadth 
  .027 
  inch. 
  

  

  Var. 
  (?) 
  minus 
  is 
  more 
  slender, 
  with 
  the 
  apex 
  less 
  prominent. 
  

   Length 
  .062 
  inch 
  ; 
  breadth 
  .02 
  inch. 
  

  

  Station. 
  — 
  Unknown. 
  

  

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

  

  2 
  specimens 
  were 
  found, 
  viz. 
  1 
  of 
  each 
  variety. 
  

  

  215. 
  Ccecum 
  laqueatum. 
  Nov. 
  sp. 
  

  

  Shell 
  slender, 
  moderately 
  arcuated, 
  with 
  the 
  diameter 
  regu- 
  

   larly 
  increasing 
  : 
  white 
  : 
  longitudinally 
  furrowed 
  with 
  about 
  20 
  

   shallow 
  somewhat 
  unequal 
  grooves 
  : 
  apex 
  moderately 
  promi- 
  

   nent, 
  lateral. 
  

  

  Length 
  .11 
  inch 
  ; 
  breadth 
  .028 
  inch. 
  

  

  Station. 
  — 
  Unknown. 
  

  

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

   2 
  specimens 
  were 
  obtained. 
  

  

  216. 
  € 
  cecum 
  monstrosum. 
  Nov. 
  sp. 
  

  

  Shell 
  well 
  arcuated, 
  stout 
  in 
  the 
  lower 
  half 
  and 
  very 
  slender 
  

   in 
  the 
  upper 
  half, 
  with 
  the 
  transition 
  abrupt, 
  as 
  if 
  the 
  effect 
  of 
  

   an 
  accident: 
  ivory 
  white: 
  on 
  the 
  upper 
  part 
  with 
  about 
  18 
  

   rather 
  stout 
  approximate 
  moderately 
  prominent 
  rings 
  with 
  flat 
  

  

  