﻿54 
  PROCEEDINGS 
  OF 
  THE 
  GEOLOGICAL 
  SOCIETY. 
  [Nov. 
  18, 
  

  

  species 
  of 
  the 
  genus 
  by 
  its 
  extremely 
  large 
  umbilicus, 
  single 
  row 
  of 
  

   spines, 
  closely 
  set 
  and 
  biserially 
  arranged 
  impressed 
  striae, 
  and 
  ab- 
  

   sence 
  of 
  keels 
  and 
  rows 
  of 
  granules. 
  

  

  In 
  some 
  parts 
  of 
  the 
  shell, 
  in 
  certain 
  specimens, 
  the 
  interspaces 
  

   have 
  more 
  the 
  appearance 
  of 
  raised 
  lines, 
  and 
  consequently 
  the 
  im- 
  

   pressed 
  striae 
  appear 
  to 
  be 
  the 
  interspaces 
  ; 
  but 
  usually 
  the 
  descrip- 
  

   tion 
  given 
  above 
  is 
  most 
  applicable. 
  

  

  Dimensions. 
  — 
  Figured 
  specimen 
  : 
  length 
  1| 
  inch, 
  breadth 
  -J 
  inch 
  ; 
  

   length 
  of 
  aperture 
  § 
  inch, 
  breadth 
  ^ 
  inch. 
  

  

  Matrix. 
  — 
  Some 
  of 
  the 
  specimens 
  have 
  the 
  same 
  matrix 
  as 
  Murex 
  

   Grooti, 
  the 
  others 
  the 
  same 
  as 
  Murex 
  ? 
  paradoxicus. 
  

  

  7. 
  Oliva 
  tttrictjlus 
  (juv. 
  ?), 
  Gm. 
  PI. 
  VII. 
  fig. 
  4. 
  

  

  Shell 
  fusiformly 
  ovate, 
  broad, 
  thick, 
  with 
  two 
  well-defined, 
  broad, 
  

   spiral, 
  coloured 
  bands 
  at 
  the 
  base, 
  and 
  with 
  an 
  acuminate 
  spire. 
  

   Columella 
  very 
  callous, 
  the 
  callosity 
  extending 
  upwards 
  so 
  as 
  to 
  cover 
  

   the 
  greater 
  portion 
  of 
  the 
  spire, 
  and 
  becoming 
  much 
  less 
  thick 
  to- 
  

   wards 
  the 
  base, 
  being 
  indistinct 
  where 
  the 
  columellar 
  plaits 
  com- 
  

   mence 
  — 
  that 
  portion 
  of 
  the 
  columella 
  appearing 
  to 
  be 
  somewhat 
  

   worn 
  ; 
  columellar 
  plaits 
  7 
  or 
  8 
  in 
  number, 
  separated 
  by 
  grooves, 
  the 
  

   lowest 
  of 
  which 
  is 
  by 
  far 
  the 
  deepest 
  and 
  the 
  most 
  distinct, 
  the 
  

   others 
  and 
  the 
  plaits 
  becoming 
  gradually 
  fainter 
  upwards. 
  Aperture 
  

   not 
  very 
  wide, 
  gaping 
  below 
  ; 
  inner 
  lip 
  well 
  denned, 
  the 
  edge 
  of 
  the 
  

   callosity 
  being 
  very 
  distinct, 
  and, 
  where 
  it 
  dies 
  away 
  towards 
  the 
  

   base, 
  the 
  area 
  of 
  the 
  columellar 
  plaits 
  being 
  marked 
  off 
  from 
  the 
  rest 
  

   of 
  the 
  shell 
  by 
  its 
  margin 
  forming 
  a 
  more 
  or 
  less 
  elevated 
  ridge. 
  

  

  There 
  are 
  several 
  specimens 
  of 
  this 
  species 
  in 
  the 
  collection, 
  but 
  

   they 
  are 
  all 
  of 
  small 
  size, 
  and 
  none 
  of 
  them 
  are 
  so 
  broad 
  as, 
  or 
  have 
  

   the 
  extremely 
  callous 
  appearance 
  of, 
  adult 
  specimens 
  ; 
  so 
  that 
  it 
  is 
  

   most 
  likely 
  they 
  all 
  belonged 
  to 
  young 
  individuals. 
  There 
  can 
  be 
  

   scarcely 
  a 
  doubt 
  as 
  to 
  their 
  identity 
  with 
  this 
  species. 
  

  

  Dimensions. 
  — 
  Figured 
  specimen 
  (rather 
  a 
  small 
  one) 
  : 
  length 
  1 
  -j-L- 
  

   inch, 
  breadth 
  \ 
  inch 
  ; 
  length 
  of 
  aperture 
  -| 
  inch, 
  breadth 
  -^ 
  inch. 
  

  

  Matrix. 
  — 
  A 
  greyish 
  or 
  reddish 
  sand 
  in 
  some 
  specimens, 
  and 
  a 
  

   greyish 
  marl 
  in 
  others. 
  

  

  8. 
  Conus 
  striatellus, 
  spec. 
  nov. 
  PI. 
  VII. 
  figs. 
  3a, 
  3b. 
  

  

  Shell 
  conical, 
  somewhat 
  elongated 
  at 
  the 
  base, 
  and 
  flatly 
  convex 
  

   above, 
  with 
  a 
  very 
  short 
  mucronate 
  spire. 
  Whorls 
  of 
  a 
  brown 
  colour 
  

   (varying 
  in 
  depth 
  in 
  different 
  specimens 
  and 
  in 
  different 
  parts 
  of 
  the 
  

   same 
  specimen), 
  scarcely 
  overlapping, 
  flat 
  and 
  slightly 
  grooved 
  next 
  

   the 
  suture, 
  then 
  conoidly 
  convex, 
  becoming 
  somewhat 
  drawn-out 
  to- 
  

   wards 
  the 
  base, 
  and 
  ornamented 
  laterally 
  with 
  a 
  number 
  of 
  blackish 
  

   slightly 
  raised 
  stripes. 
  Suture 
  impressed. 
  Aperture 
  narrow, 
  slightly 
  

   dilated 
  at 
  the 
  base. 
  Columella 
  slightly 
  twisted 
  and 
  grooved 
  at 
  the 
  

   base. 
  

  

  On 
  the 
  upper 
  third 
  of 
  the 
  sides 
  of 
  the 
  whorls 
  the 
  coloured 
  stripes 
  

   are 
  not 
  more 
  than 
  half 
  as 
  far 
  apart 
  as 
  on 
  the 
  middle 
  third 
  ; 
  and 
  on 
  

   the 
  lower 
  third 
  they 
  are 
  accompanied, 
  first 
  alternately 
  and 
  then 
  

   entirely, 
  by 
  slightly 
  sinuous 
  shallow 
  grooves, 
  like 
  sutures, 
  just 
  above 
  

  

  