﻿172 
  rROCICEDINGS 
  OF 
  THE 
  MALACOLOGICAL 
  SOCIETY. 
  

  

  Tliis 
  is 
  considered 
  by 
  Tryon 
  (Manual, 
  vol. 
  vi, 
  1884, 
  p. 
  251) 
  to 
  

   be 
  identical 
  with 
  31. 
  oheliscux, 
  lleeve, 
  but 
  I 
  doubt 
  tbis. 
  I 
  am, 
  

   indeed, 
  not 
  sure 
  that 
  the 
  true 
  hexagonalis 
  has 
  been 
  found 
  in 
  the 
  

   ref>ion 
  now 
  treated 
  of, 
  the 
  speiamens 
  not 
  being 
  in 
  first-class 
  

   condition. 
  I 
  have 
  oheliscus 
  from 
  Hong-Kong 
  only. 
  I 
  may 
  mention 
  

   that 
  M. 
  agna, 
  Melv. 
  & 
  St., 
  from 
  Lifu 
  and 
  Japan, 
  placed 
  under 
  

   hexagonalis 
  by 
  Bouge 
  »& 
  Dautzenberg,' 
  is, 
  in 
  my 
  opinion, 
  a 
  good 
  

   species. 
  

  

  M. 
  pi/ramis, 
  Hinds,* 
  another 
  six-sided, 
  small 
  white 
  form, 
  is 
  very 
  

   simihir, 
  but 
  the 
  outer 
  lip 
  is 
  more 
  roundly 
  expanded 
  and 
  the 
  sinus 
  

   not 
  so 
  prominent. 
  

  

  91. 
  Mangilia 
  icnTUYS, 
  Melv. 
  

  

  Mcmgilia 
  ichtliya, 
  Melvill, 
  Ann. 
  Mag. 
  Nat. 
  Hist., 
  ser. 
  viii, 
  vol. 
  vi, 
  

   1910, 
  p. 
  is, 
  pi. 
  ii, 
  f. 
  22. 
  

  

  P.G. 
  Henjam 
  Island 
  ; 
  ^Fussandam, 
  55 
  fathoms. 
  

  

  M.C. 
  Olf 
  Astola 
  Island, 
  90 
  fathoms 
  ; 
  Charbar, 
  40 
  fathoms 
  (1906). 
  

  

  Allied 
  to 
  M. 
  obeliscus, 
  Keeve, 
  which 
  lias 
  not 
  yet 
  been 
  found 
  in 
  this 
  

   region, 
  and 
  M. 
  calcata, 
  Hedley, 
  of 
  which 
  an 
  unique 
  specimen 
  was 
  

   dredged 
  at 
  5-10 
  fatlioms, 
  off 
  Hope 
  Islaiul, 
  North 
  Queensland, 
  but, 
  as 
  

   pointed 
  out 
  by 
  me 
  in 
  tlie 
  description 
  of 
  icJdhys, 
  the 
  characters 
  of 
  the 
  

   sinus 
  are 
  altogether 
  different 
  in 
  the 
  two 
  species. 
  The 
  ribs, 
  too, 
  of 
  

   our 
  species 
  are 
  more 
  acute 
  and 
  strong 
  ; 
  in 
  calcata 
  ^ 
  they 
  are 
  well 
  

   described 
  as 
  "obliipie, 
  wave-like, 
  radial 
  folds, 
  five 
  to 
  a 
  Avhorl, 
  

   expanded 
  aiul 
  projecting 
  prominently 
  at 
  the 
  summit 
  of 
  each 
  whorl". 
  

   The 
  very 
  fine 
  spiral 
  threads 
  running 
  over 
  the 
  whole 
  surface 
  are 
  

   a 
  characteristic 
  feature 
  of 
  both 
  species 
  in 
  common. 
  M. 
  alticostata, 
  

   Sowb., 
  a 
  South 
  Australian 
  species 
  that 
  appears 
  to 
  have 
  found 
  its 
  way 
  

   to 
  the 
  region 
  now 
  treated 
  of, 
  may 
  possibly 
  be 
  an 
  elongate 
  form 
  of 
  

   ichthys 
  or, 
  perhaps, 
  calcata. 
  

  

  92. 
  ^Iangilia 
  KOWEiTKNsrs, 
  Melv, 
  

  

  Maiigilta 
  Icoiveitcnsis, 
  ilelvill, 
  Proc. 
  Malac. 
  Soc. 
  Lond., 
  vol. 
  vi, 
  1904, 
  

   p. 
  167, 
  pi. 
  X, 
  f. 
  23. 
  

  

  P.G. 
  Koweit, 
  10 
  fathoms. 
  

  

  A 
  citharoid 
  species, 
  near 
  M. 
  arcta, 
  E. 
  A. 
  Smith, 
  with 
  which 
  I 
  twice 
  

   couipared 
  it, 
  in 
  the 
  company 
  of 
  the 
  author, 
  and 
  we 
  determined 
  it 
  as 
  

   quite 
  distinct. 
  Jielouging 
  to 
  the 
  gracilenta 
  " 
  gens 
  ". 
  

  

  93. 
  Mangilia 
  lucida 
  (Sm.). 
  (PL 
  IX, 
  Fig. 
  16.) 
  

   Pleurotoma 
  [Clathurella) 
  lucida, 
  E. 
  A. 
  Smith, 
  Ann. 
  Mag. 
  Nat. 
  Hist., 
  

   ser. 
  V, 
  vol. 
  xiv, 
  1884, 
  p. 
  323. 
  

   I. 
  Bombay 
  ( 
  Abercrombie). 
  

  

  Allied 
  to 
  horneana, 
  Sm., 
  gradata, 
  Nevill, 
  myrmecodes, 
  Melv. 
  & 
  St., 
  

   etc., 
  but 
  more 
  coarsely 
  costate, 
  the 
  costa) 
  few 
  in 
  number, 
  while 
  the 
  

   s])iral 
  lirjc 
  are 
  likewise 
  sparse 
  and 
  very 
  incrassate, 
  about 
  10 
  only 
  on 
  

   the 
  body-whorl. 
  It 
  has 
  not 
  yet 
  occurred 
  north 
  of 
  Bombay. 
  

  

  ' 
  Journ. 
  de 
  Conch., 
  torn. 
  Ixi, 
  1913, 
  p. 
  150. 
  

  

  2 
  lleeve, 
  Conch. 
  Icon., 
  vol. 
  i, 
  1843, 
  pi. 
  xviii, 
  f. 
  147. 
  

  

  ' 
  Proc. 
  Linn. 
  Soc. 
  New 
  S. 
  Wales, 
  vol. 
  xxxiv, 
  1909, 
  p. 
  456, 
  pi. 
  xliv, 
  f. 
  90. 
  

  

  