﻿16 
  

  

  ON 
  SILIQUARIA 
  WILMANM, 
  N.SP., 
  FROM 
  SOUTH 
  AFRICA. 
  

   By 
  J. 
  R. 
  Le 
  B. 
  Tomlin, 
  M.A., 
  F.E.S. 
  

  

  Read 
  14th 
  December, 
  1917. 
  

  

  The 
  species 
  which 
  I 
  propose 
  to 
  designate 
  by 
  tliis 
  name 
  is 
  very 
  

   possibly 
  that 
  listed 
  by 
  Sowerby 
  ' 
  as 
  a 
  small 
  form 
  of 
  Stliqnaria 
  obtusa, 
  

   Schumacher, 
  and 
  by 
  Hartsch 
  - 
  as 
  S. 
  tveldi, 
  T. 
  -Woods 
  ; 
  at 
  any 
  rate, 
  it 
  is 
  

   one 
  of 
  the 
  many 
  endemic 
  Cape 
  species 
  that 
  have 
  till 
  recently 
  been 
  

   erroneously 
  identified 
  with 
  species 
  from 
  other 
  parts 
  of 
  the 
  world. 
  

   This 
  shell 
  does 
  not 
  tally 
  with 
  Schumacher's 
  description 
  of 
  his 
  

   Angumaria 
  obtusa, 
  and 
  I 
  do 
  not 
  entertain 
  for 
  a 
  moment 
  the 
  possibility 
  

   of 
  its 
  identity 
  with 
  a 
  Tusmanian 
  species. 
  

  

  The 
  shell 
  is 
  smooth 
  and 
  without 
  sculptvire, 
  as 
  far 
  as 
  can 
  be 
  

   ascertained 
  from 
  beach 
  specimens, 
  Avhite 
  or 
  brownish 
  in 
  colour, 
  

   consisting 
  of 
  6-7 
  whorls, 
  which 
  as 
  a 
  rule 
  take 
  the 
  form 
  of 
  a 
  rather 
  

   regular, 
  disconnected, 
  spiral 
  coil. 
  

  

  m 
  m. 
  

  

  The 
  apex 
  is 
  decollate 
  in 
  all 
  the 
  specimens 
  I 
  have 
  seen, 
  and 
  the 
  

   broken 
  end 
  of 
  the 
  coil 
  is 
  frequently 
  plugged 
  by 
  the 
  animal. 
  The 
  slit 
  

   appears 
  on 
  the 
  upper 
  whorls 
  as 
  a 
  deep 
  canaliculation 
  closed 
  with 
  a 
  

   lamella, 
  becoming 
  open 
  on 
  the 
  last 
  two 
  or 
  three 
  whorls, 
  and 
  the 
  

   species 
  therefore 
  falls 
  into 
  Morch's 
  section 
  Pyxipoma. 
  The 
  altitude 
  

   of 
  the 
  type-specimen 
  is 
  15'5mm., 
  and 
  the 
  diameter 
  of 
  tlie 
  tube 
  

   25 
  mm., 
  but 
  the 
  latter 
  measurement 
  varies 
  considerably 
  in 
  different 
  

   specimens. 
  

  

  Loc. 
  — 
  Port 
  Alfred, 
  Jeflfreys 
  Bay, 
  and 
  East 
  London. 
  Probably 
  it 
  

   is 
  generally 
  distributed 
  in 
  the 
  Cape 
  region. 
  

  

  In 
  general 
  form 
  and 
  size 
  S. 
  tvihnance 
  is 
  very 
  similar 
  to 
  S. 
  senegalensis, 
  

   Reel., 
  but 
  the 
  latter 
  belongs 
  to 
  the 
  section 
  Agathirses, 
  the 
  slit 
  taking 
  

   the 
  form 
  of 
  a 
  series 
  of 
  separate, 
  irregular 
  apertures. 
  

  

  Type. 
  — 
  The 
  longer 
  of 
  the 
  two 
  examples 
  figured, 
  which 
  is 
  in 
  my 
  

   own 
  collection. 
  

  

  ^ 
  Marine 
  Shells 
  of 
  South 
  Africa, 
  p. 
  .39. 
  

  

  - 
  Kept. 
  Turton 
  Coll. 
  S. 
  Afr. 
  Marine 
  Moll. 
  (U.S. 
  Nat. 
  Mus. 
  Bull. 
  91), 
  p. 
  117. 
  

  

  