﻿10 
  

  

  PKOCKKDINGS 
  OF 
  THE 
  MALACOLOGICAI, 
  SOCIETT. 
  

  

  low-spired 
  forms 
  of 
  Lotorium 
  is 
  carried 
  into 
  the 
  Crossata 
  group 
  of 
  

   '' 
  Banella'\ 
  

  

  The 
  evidence, 
  then, 
  of 
  the 
  operculuiu, 
  plus 
  cei'tain 
  other 
  con- 
  

   siderations 
  which 
  have 
  appeared 
  in 
  this 
  paper, 
  would 
  lead 
  one 
  to 
  

   throw 
  out 
  the 
  suggestion 
  that 
  perhaps 
  Dall's 
  chissitication 
  might 
  

   with 
  advantage 
  be 
  modified 
  in 
  the 
  following 
  way 
  : 
  — 
  

  

  A. 
  Sub-genus 
  Bursa, 
  containing 
  iu 
  a 
  single 
  section 
  Bursa, 
  s.str., 
  

   Chasmotheca, 
  and 
  probably 
  Marsupma. 
  

  

  2. 
  A^S^^MV 
  

  

  Fig. 
  1. 
  — 
  Median 
  teeth 
  of: 
  — 
  1. 
  Bursa 
  granular 
  is. 
  Bolt., 
  Umkomaas, 
  Natal. 
  _ 
  

   2. 
  Triton 
  (Lotorium) 
  australis, 
  Lam., 
  Port 
  Jackson. 
  3. 
  Crossata 
  

   ventricosa, 
  Brod., 
  Orange 
  Harbour, 
  Tierra 
  del 
  Fuego. 
  4. 
  (Triton) 
  

   leucostoma, 
  Lam., 
  Port 
  Shepstone. 
  5. 
  Eugyrina 
  gigantea, 
  Lam., 
  

   Algiers. 
  6. 
  Crossata 
  californica, 
  Hinds, 
  San 
  Pedro, 
  Cal. 
  All 
  from 
  

   Professor 
  Gwatkin's 
  collection. 
  

  

  B. 
  Sub-genus 
  Aspa. 
  

  

  C. 
  A 
  sub-genus 
  (Ranella 
  would 
  be 
  a 
  convenient 
  title) 
  including 
  

   all 
  the 
  sections 
  whose 
  operculum 
  is 
  sub-marginal, 
  generally 
  ])ut 
  not 
  

   always 
  to 
  the 
  right, 
  or 
  sub-terminal, 
  viz. 
  Ranella, 
  Lantpadopsis, 
  

   Colnbrellina, 
  and 
  Bufonaria. 
  

  

  D. 
  A 
  sub-genus 
  (call 
  it 
  Crossata 
  if 
  you 
  like) 
  including 
  tlie 
  two 
  

   species 
  californica 
  and 
  ventricosa, 
  the 
  form 
  of 
  whose 
  shell 
  and 
  sliape 
  

   of 
  whose 
  operculum 
  approximate 
  towards 
  the 
  " 
  Tritons 
  ". 
  

  

  