﻿MOLLTTSCA. 
  67 
  

  

  the 
  oblique 
  pale 
  brown 
  stripes 
  on 
  the 
  narrowest 
  extremity 
  of 
  the 
  

   body-whorl, 
  the 
  longitudinal 
  more 
  or 
  less 
  nodulous 
  costoe 
  subobsolete 
  

   on 
  the 
  last 
  whorl, 
  and 
  the 
  transverse 
  striation 
  and 
  lira). 
  The 
  

   number 
  of 
  whorls 
  seems 
  to 
  vary 
  very 
  considerably 
  in 
  the 
  ten 
  speci- 
  

   mens 
  under 
  examination, 
  and 
  the 
  apex 
  of 
  the 
  spire 
  appears 
  to 
  be 
  

   invariably 
  broken 
  off. 
  When 
  this 
  has 
  occurred 
  the 
  animal 
  closes 
  

   the 
  top 
  with 
  a 
  smooth, 
  shelly, 
  spiral 
  callosity, 
  and 
  it 
  becomes 
  

   a 
  matter 
  of 
  uncertainty 
  how 
  many 
  whorls 
  may 
  have 
  been 
  lost. 
  

   This 
  will 
  account 
  for 
  the 
  great 
  difference 
  in 
  the 
  number 
  oi 
  remaming 
  

   volutions 
  in 
  the 
  following 
  specimens 
  : 
  — 
  No. 
  1 
  (the 
  type 
  of 
  C. 
  pyg- 
  

   nuva 
  from 
  the 
  collection 
  of 
  the 
  late 
  Henrj^ 
  Adams) 
  has 
  six 
  and 
  a 
  

   half 
  normal 
  whorls 
  left 
  ; 
  Nos. 
  2, 
  3, 
  and 
  4 
  have 
  seven 
  each, 
  5 
  and 
  6 
  

   have 
  eight 
  each, 
  No. 
  7 
  has 
  nine. 
  No. 
  8 
  ten, 
  No. 
  9 
  eleven, 
  and 
  

   No. 
  lU 
  has 
  twelve. 
  The 
  number 
  of 
  whorls 
  represented 
  in 
  the 
  

   figures 
  of 
  C. 
  macrostoma 
  are 
  not 
  reliable, 
  as 
  fig. 
  12 
  represents 
  

   seventeen, 
  whilst 
  fig. 
  11 
  (evidently 
  taken 
  from 
  the 
  same 
  specimen) 
  

   exhibits 
  but 
  fifteen. 
  The 
  costa) 
  are 
  also 
  somewhat 
  vai'iable 
  in 
  

   number 
  and 
  prominence, 
  but 
  invariably 
  become 
  more 
  or 
  less 
  obsolete 
  

   on 
  the 
  contracted 
  body-whorl, 
  where, 
  being 
  crossed 
  by 
  the 
  spiral 
  

   sulci, 
  they 
  present 
  the 
  granular 
  aspect 
  described 
  by 
  A. 
  Adams 
  in 
  his 
  

   diagnosis 
  of 
  G. 
  costata. 
  The 
  outer 
  lip, 
  which 
  is 
  very 
  liable 
  to 
  be 
  

   broken 
  away, 
  is 
  expanded, 
  thickened 
  but 
  not 
  varixed, 
  grooved 
  ex- 
  

   ternally 
  and 
  spotted 
  with 
  red 
  lines, 
  which 
  for 
  the 
  most 
  part 
  fall 
  in 
  

   the 
  grooves 
  referred 
  to. 
  Within 
  it 
  is 
  smooth, 
  and 
  in 
  full-grown 
  

   specimens 
  exhibits 
  a 
  slight 
  tubercular 
  prominence, 
  above 
  which 
  a 
  

   small 
  sinus 
  is 
  observable, 
  close 
  to 
  the 
  suture. 
  

  

  70. 
  Cerithium 
  (Rhinoclavis) 
  fasciatura. 
  

  

  Cerithimn 
  ftisciatiira, 
  Brug., 
  Kiener, 
  Coq. 
  Viv. 
  pi. 
  20. 
  figs. 
  1-1 
  c; 
  

   Suwerby, 
  Conch. 
  Icon., 
  Vertagus, 
  figs. 
  9 
  a, 
  9 
  h. 
  

  

  Ilah. 
  Friday 
  Island, 
  Torres 
  Straits. 
  

  

  The 
  young 
  specimen 
  from 
  this 
  locality 
  is 
  very 
  like 
  Sowerby'a 
  

   figure 
  9 
  h, 
  but 
  the 
  lower 
  part 
  of 
  the 
  last 
  whorl 
  is 
  white 
  entirely. 
  

  

  71. 
  Cerithium 
  (Rhinoclavis) 
  vertagus. 
  

  

  Cerithium 
  vertagus, 
  Linn., 
  Kiencr, 
  Coq. 
  Viv. 
  pi. 
  18. 
  fig. 
  2. 
  

   Vertagus 
  vulgaris, 
  Schumacher, 
  Essai 
  Nouv. 
  Syst. 
  p. 
  228; 
  Adams, 
  

   Genera, 
  i. 
  p. 
  285, 
  pi. 
  30. 
  figs. 
  1-1 
  c. 
  

  

  Hah. 
  Port 
  Molle, 
  Queensland, 
  and 
  Friday 
  Island, 
  Torres 
  Straits, 
  

   on 
  the 
  beach. 
  

  

  72. 
  Cerithium 
  (Khinoclavis) 
  koclii. 
  

  

  Cerithium 
  kocbi, 
  Philippi, 
  Ahhild. 
  iii. 
  pi. 
  1. 
  fig. 
  3; 
  Sowerhy, 
  Thes. 
  

   Cmich. 
  vol. 
  ii. 
  pi. 
  176. 
  figs. 
  13-15 
  ; 
  id. 
  ifi 
  Reeve's 
  Conch. 
  Icon., 
  Ver- 
  

   tagus, 
  figs. 
  26 
  a, 
  h. 
  

  

  Ilah. 
  Red 
  Sea 
  (MacAndrew) 
  ; 
  East 
  Africa 
  (Philijipi) 
  ; 
  Mauritius 
  

   i^Mobius) 
  ; 
  Amirantes 
  Islands, 
  at 
  Poivre 
  Island 
  in 
  20 
  fms., 
  and 
  He 
  

  

  