﻿378 
  Panama 
  Shells. 
  MURicm^. 
  

  

  200. 
  Cerithium 
  irroratum. 
  

  

  Synonymy. 
  

  

  Cerithium 
  irroratum 
  Gould 
  in 
  Proc. 
  Bost. 
  Soc. 
  Nat. 
  Hist. 
  

  

  IIL 
  119. 
  - 
  - 
  - 
  - 
  Feb. 
  1849, 
  

   Gould 
  Exped. 
  SHells. 
  p. 
  61. 
  Feb. 
  1849. 
  

  

  This 
  species 
  closely 
  resembles 
  C. 
  ocellatum 
  Brug., 
  but 
  Dr. 
  

   Grould 
  informs 
  me 
  that 
  it 
  is 
  bis 
  G. 
  irroratum. 
  

  

  Station. 
  — 
  At 
  and 
  above 
  half 
  tide 
  level 
  ; 
  mostly 
  in 
  the 
  margio 
  

   of 
  water 
  left 
  on 
  the 
  rocks 
  by 
  the 
  tide. 
  

  

  Habitat. 
  — 
  Unknown 
  ; 
  Gould, 
  in 
  Exped. 
  Shells. 
  

  

  Mazatlan 
  ; 
  Lt. 
  Green 
  ! 
  Gould 
  MSS. 
  

  

  Panama 
  and 
  Taboga 
  ; 
  C. 
  B. 
  A. 
  ! 
  

   Eight 
  hundred 
  and 
  twenty 
  specimens 
  were 
  collected, 
  

  

  201. 
  Cerithium 
  neg^lectum. 
  Nov. 
  sp. 
  

  

  Shell 
  long, 
  ovate 
  conic 
  : 
  blackish 
  red, 
  with 
  the 
  apex 
  white 
  : 
  

   with' 
  three 
  prominent 
  spiral 
  ridges 
  on 
  each 
  whorl, 
  of 
  which 
  

   the 
  upper 
  two 
  are 
  less 
  distant 
  ; 
  with 
  prominent 
  transverse 
  

   ridges, 
  sixteen 
  or 
  eighteen 
  on 
  the 
  last 
  whorl, 
  where 
  they 
  are 
  

   less 
  robust 
  than 
  on 
  the 
  spire, 
  and 
  which 
  become 
  obsolete 
  on 
  

   the 
  periphery 
  of 
  the 
  last 
  whorl 
  ; 
  with 
  the 
  intersections 
  developed 
  

   into 
  very 
  prominent 
  elegantly 
  rounded 
  nodules 
  ; 
  anteriorly 
  

   with 
  two 
  additional 
  subgranulous 
  spiral 
  ridges; 
  apex 
  acute: 
  

   spire 
  with 
  curvilinear 
  outlines 
  : 
  whorls 
  ten, 
  moderately 
  convex, 
  

   with 
  the 
  suture 
  indistinct; 
  last 
  whorl 
  rather 
  short: 
  aperture 
  

   obliquely 
  subovate 
  : 
  labrum 
  a 
  little 
  modified 
  by 
  the 
  spiral 
  

   ridges 
  : 
  canal 
  deep, 
  very 
  short. 
  

  

  Mean 
  divergence 
  about 
  20° 
  ; 
  length 
  .125 
  inch 
  ; 
  breadth 
  .04 
  

   inch 
  ; 
  length 
  of 
  spire 
  .09 
  inch. 
  

  

  Station. 
  — 
  Under 
  stones, 
  in 
  old 
  shells, 
  in 
  dead 
  sponges, 
  &c., 
  

   near 
  low 
  water 
  mark. 
  

  

  