﻿CINGULA. 
  Panama 
  Shells. 
  405 
  

  

  251. 
  Rissoa 
  • 
  Sp. 
  indet. 
  

  

  The 
  sculpture 
  of 
  this 
  shell 
  shows 
  it 
  to 
  be 
  distinct 
  from 
  any 
  

   others 
  which 
  we 
  have 
  enumerated 
  : 
  but 
  the 
  apex 
  and 
  the 
  lip 
  

   are 
  both 
  defective 
  in 
  the 
  single 
  specimen 
  found 
  at 
  Panama. 
  

  

  Family— 
  TEOCHID^. 
  

   252. 
  Cing^iila 
  (?) 
  inconspicua. 
  Nov. 
  sp. 
  

  

  Shell 
  ovate 
  fusoid 
  : 
  white 
  : 
  with 
  several 
  spiral 
  ridges, 
  of 
  which 
  

   four 
  are 
  seen 
  on 
  the 
  penult 
  whorl, 
  and 
  of 
  which 
  the 
  upper 
  two 
  

   are 
  less 
  prominent 
  ; 
  anteriorly 
  the 
  ridges 
  are 
  also 
  less 
  promi- 
  

   nent 
  ; 
  with 
  transverse 
  ridges 
  decussating 
  the 
  upper 
  spiral 
  ridges 
  

   and 
  terminating 
  at 
  the 
  third 
  : 
  apex 
  subacute 
  : 
  spire 
  with 
  the 
  

   outlines 
  a 
  little 
  curvilinear 
  : 
  whorls 
  five, 
  a 
  little 
  convex, 
  with 
  

   a 
  well 
  impressed 
  suture 
  ; 
  last 
  whorl 
  small 
  : 
  aperture 
  small, 
  

   ovate, 
  acute 
  above 
  : 
  labrum 
  rather 
  thin 
  : 
  labium 
  well 
  developed 
  : 
  

   umbilical 
  region 
  a 
  little 
  indented. 
  

  

  Mean 
  divergence 
  about 
  80° 
  ; 
  length 
  .065 
  inch 
  ; 
  breadth 
  .035 
  

   inch; 
  length 
  of 
  spire 
  .045 
  inch. 
  

  

  Some 
  authors 
  would 
  refer 
  this 
  species 
  to 
  Eissoa: 
  but 
  the 
  aper- 
  

   ture 
  is 
  Turbinoid 
  rather 
  than 
  Melanoid. 
  

  

  Station. 
  — 
  Unknown. 
  

  

  Habitat 
  — 
  Panama 
  ; 
  C. 
  B. 
  A. 
  ! 
  

  

  3 
  specimens 
  were 
  found 
  in 
  the 
  calcareous 
  sand. 
  

  

  253. 
  Cing^ula 
  paiipercula. 
  Nov. 
  sp. 
  

  

  Shell 
  conoid 
  : 
  dingy 
  white, 
  sometimes 
  with 
  a 
  pale 
  brown 
  spi- 
  

   ral 
  stripe 
  on 
  the 
  middle 
  of 
  the 
  whorls 
  : 
  surface 
  smooth 
  : 
  apex 
  

   subacute: 
  spire 
  with 
  the 
  outlines 
  nearly 
  rectilinear: 
  whorls 
  

   five, 
  planulate, 
  with 
  a 
  well 
  impressed 
  suture 
  : 
  aperture 
  broadly 
  

   ovate 
  : 
  labrum 
  slightly 
  thickened 
  : 
  labium 
  well 
  developed 
  : 
  

   umbilicus 
  very 
  minute. 
  

  

  