﻿52 
  PROCEEDINGS 
  OF 
  THE 
  GEOLOGICAL 
  SOCIETY. 
  [Nov. 
  18, 
  

  

  obliquely 
  oval 
  ; 
  inner 
  lip 
  distinct 
  ; 
  canal 
  very 
  short, 
  oblique, 
  very 
  wide, 
  

   and 
  abruptly 
  truncated. 
  

  

  This 
  shell 
  is 
  clearly 
  related 
  to 
  M. 
  minax, 
  Lam., 
  a 
  well-known 
  

   Paris-Basin 
  species 
  ; 
  but 
  the 
  alliance 
  is 
  not 
  remarkably 
  close. 
  It 
  

   would 
  perhaps 
  be 
  advisable 
  to 
  collect 
  such 
  species 
  as 
  the 
  one 
  under 
  

   consideration, 
  with 
  M. 
  minax, 
  &c, 
  into 
  a 
  distinct 
  genus 
  or 
  subgenus. 
  

   They 
  appear 
  to 
  be 
  really 
  spiniferous 
  whelks. 
  

  

  Dimensions 
  (largest 
  specimen). 
  — 
  Length 
  1^ 
  5 
  T 
  inch, 
  breadth 
  ^ 
  

   inch 
  ; 
  length 
  of 
  aperture 
  ^ 
  inch, 
  breadth 
  \ 
  inch 
  ; 
  length 
  of 
  canal 
  

  

  2T 
  inch 
  - 
  

  

  Matrix. 
  — 
  Greyish 
  sand. 
  

  

  3. 
  Murex? 
  sp. 
  

  

  One 
  badly 
  preserved 
  and 
  mutilated 
  specimen 
  of 
  a 
  shell 
  apparently 
  

   similar 
  in 
  form 
  to 
  Pyrula 
  rusticula, 
  Bast., 
  but 
  probably 
  a 
  Murex, 
  is 
  

   contained 
  in 
  M. 
  de 
  Groot's 
  collection. 
  It 
  differs 
  from 
  the 
  above-men- 
  

   tioned 
  Pyrula 
  in 
  having 
  several 
  rows 
  of 
  tubercles, 
  on 
  the 
  last 
  whorl, 
  

   collected 
  into 
  indistinct 
  varices 
  ; 
  it 
  appears 
  to 
  have 
  had 
  a 
  slightly 
  

   oblique 
  canal, 
  which 
  is 
  broken 
  off 
  just 
  below 
  the 
  aperture. 
  The 
  

   outer 
  lip 
  is 
  very 
  defective, 
  and 
  the 
  surface 
  of 
  the 
  shell 
  is 
  so 
  corroded 
  

   and 
  bored 
  into 
  that 
  it 
  is 
  impossible 
  to 
  make 
  out 
  any 
  of 
  its 
  characters. 
  

   The 
  thinner 
  portions 
  of 
  the 
  shell 
  are 
  translucent, 
  and 
  the 
  interior 
  is 
  

   somewhat 
  nacreous 
  ; 
  these 
  circumstances, 
  together 
  with 
  the 
  fresh- 
  

   looking 
  appearance 
  of 
  the 
  corroded 
  surface, 
  and 
  the 
  almost 
  total 
  

   absence 
  of 
  any 
  matrix, 
  induced 
  me 
  to 
  suspect 
  that 
  it 
  was 
  not 
  a 
  fossil. 
  

   It 
  is 
  very 
  unlikely, 
  however, 
  that 
  M. 
  de 
  Groot 
  would 
  have 
  made 
  such 
  

   a 
  mistake 
  ; 
  and, 
  moreover, 
  Mount 
  Sela 
  is 
  a 
  considerable 
  distance 
  from 
  

   the 
  sea. 
  Possibly 
  this 
  may 
  be 
  the 
  shell 
  referred 
  to 
  by 
  M. 
  Junghuhn 
  

   as 
  Murex 
  minax, 
  to 
  which 
  it 
  bears 
  some 
  degree 
  of 
  resemblance. 
  

  

  Matrix. 
  — 
  The 
  small 
  portions 
  of 
  matrix 
  found 
  in 
  the 
  fragment 
  of 
  

   the 
  canal, 
  and 
  in 
  the 
  cavities 
  made 
  by 
  boring-shells, 
  appear 
  to 
  con- 
  

   sist 
  of 
  a 
  dark-grey 
  mud. 
  

  

  4. 
  Pyrula 
  cocHLiDirnvr, 
  Linn. 
  PI. 
  VI. 
  fig. 
  4. 
  

  

  Shell 
  fusiformly 
  pear-shaped, 
  with 
  an 
  elevated 
  spire, 
  and 
  an 
  ex- 
  

   cavated, 
  slightly 
  sinuous 
  suture. 
  "Whorls 
  angular, 
  longitudinally 
  

   ribbed, 
  transversely 
  lirate, 
  flat 
  above, 
  the 
  flat 
  portion 
  being 
  marked 
  

   by 
  three 
  parallel 
  raised 
  ridges 
  ; 
  ribs 
  (9) 
  broad, 
  flatly 
  convex, 
  dying 
  

   away 
  towards 
  the 
  base, 
  and 
  each 
  crowned 
  at 
  the 
  angle 
  with 
  a 
  strong, 
  

   compressed, 
  slightly 
  ascending 
  tubercle. 
  Transverse 
  ridges 
  most 
  

   evident 
  near 
  the 
  base, 
  where 
  they 
  are 
  alternately 
  larger 
  and 
  smaller, 
  

   and 
  somewhat 
  sinuous 
  ; 
  nearer 
  the 
  angle 
  the 
  alternate 
  smaller 
  ridges 
  

   are 
  wanting, 
  and 
  the 
  others 
  are 
  broader, 
  less 
  prominent, 
  and 
  scarcely 
  

   sinuous. 
  Aperture 
  narrowly 
  spathulate 
  ; 
  outer 
  lip 
  dentate 
  at 
  the 
  

   margin, 
  and 
  marked 
  interiorly 
  by 
  a 
  number 
  of 
  parallel 
  ridges 
  ; 
  inner 
  

   lip 
  indistinct. 
  

  

  This 
  species, 
  well 
  known 
  in 
  the 
  recent 
  state 
  as 
  an 
  inhabitant 
  of 
  

   Torres 
  Straits, 
  is 
  represented 
  in 
  the 
  Javan 
  collection 
  by 
  a 
  single 
  spe- 
  

   cimen, 
  deficient 
  in 
  the 
  uppermost 
  whorls, 
  but 
  agreeing 
  with 
  recent 
  

   specimens 
  in 
  every 
  particular, 
  except 
  that 
  the 
  latter 
  do 
  not 
  exhibit 
  

  

  