﻿IREDAIE 
  : 
  MOLLUSCAN 
  NOMENCLATDKAL 
  PROBLEMS. 
  39 
  

  

  Purpura 
  monodonta, 
  Blainville, 
  antedates 
  P. 
  tnonodonta, 
  Quoy 
  & 
  

  

  Gaiiuafd. 
  

   fenestrata, 
  Blainville 
  ,, 
  P. 
  cmicelluta, 
  Quoy 
  & 
  

  

  Gainiard, 
  not 
  of 
  Bol- 
  

   ten.Mus. 
  Bolt., 
  1798, 
  

   p. 
  143. 
  

   However, 
  P. 
  chiidea, 
  Diiclos, 
  is 
  claimed 
  to 
  be 
  identical 
  with 
  the 
  

   \)v\.ov 
  Purpura 
  nod^^l^fera, 
  IsienkG, 
  1829. 
  

  

  The 
  species 
  Duclos 
  described 
  as 
  Purpura 
  spharidia 
  has 
  been 
  

   recognized 
  as 
  Ricinula 
  morus, 
  Lamarck, 
  Avhich 
  name 
  is 
  later 
  than 
  

   Morula 
  papulosa, 
  Schumacher, 
  and 
  which 
  I 
  determine 
  as 
  Drupa 
  uva, 
  

   Bolten 
  (Mus. 
  Bolten, 
  1798, 
  p. 
  56). 
  In 
  order 
  to 
  avoid 
  chan<;e 
  of 
  the 
  

   Avell-known 
  t)iorus 
  Pilsbry 
  lias 
  recently 
  pleaded 
  that 
  the 
  figure 
  given 
  

   by 
  Chemnitz 
  was 
  not 
  accurately 
  determinable. 
  The 
  desci'iption, 
  

   however, 
  is 
  very 
  good. 
  He 
  would 
  then 
  fall 
  back 
  upon 
  the 
  

   illustration 
  in 
  the 
  Tabl. 
  Encycl. 
  ]\rethod., 
  pi. 
  395, 
  fig. 
  6. 
  Here 
  again 
  

   danger 
  lies, 
  because 
  that 
  figure 
  was 
  named 
  Ricinula 
  nodus 
  by 
  

   Lamarck 
  himself 
  prior 
  to 
  his 
  proposal 
  of 
  the 
  name 
  morns 
  for 
  the 
  

   same 
  shell. 
  

  

  The 
  outstanding 
  groups 
  appear 
  to 
  be 
  as 
  follows 
  : 
  — 
  

  

  Drupa, 
  Bolten, 
  1798 
  (type, 
  ILurex 
  ricinus, 
  Linne) 
  = 
  Sistrum, 
  

   Montfort, 
  1810 
  = 
  Ricinula, 
  Lamarck, 
  1816 
  = 
  Ricinella, 
  

   iSchumacher, 
  1817. 
  

  

  Morula, 
  Schumacher, 
  1817 
  (type, 
  M. 
  papillosa 
  = 
  Brupa 
  uva, 
  Bolten, 
  

   1798). 
  

  

  Semiricinula, 
  Martens, 
  1903 
  (type. 
  Purpura 
  muricina, 
  Blainville). 
  

  

  Muricodrupa, 
  gen. 
  nov. 
  for 
  Purpura 
  fenestrata, 
  Blainville. 
  

  

  I 
  ha<l 
  ranged 
  the 
  species 
  in 
  order 
  when 
  Dr. 
  Cooke 
  informed 
  me 
  

   that 
  he 
  proposes 
  to 
  develop 
  his 
  studies 
  on 
  the 
  radulaj 
  in 
  the 
  near 
  

   future, 
  and 
  his 
  notes 
  show 
  that 
  in 
  this 
  group 
  not 
  only 
  shell 
  

   distinctions 
  coincide 
  with 
  radular 
  differences, 
  but 
  also 
  that 
  

   convergence 
  in 
  shell 
  features 
  may 
  mask 
  divergence 
  in 
  the 
  characters 
  

   of 
  the 
  radula. 
  

  

  Teretianax, 
  gen. 
  nov. 
  for 
  Scalenostoma 
  suteri, 
  Oliver. 
  

  

  Bartsch 
  in 
  his 
  "Monograph 
  of 
  West 
  American 
  Melanellid 
  

   MoUusks" 
  (Proc. 
  U.S. 
  Nat. 
  Mus., 
  vol. 
  liii, 
  Aug. 
  1917, 
  pp. 
  295-356) 
  

   has 
  in 
  my 
  opinion 
  misused 
  group 
  names 
  in 
  an 
  extraordinary 
  manner. 
  

   One 
  item 
  will 
  suffice 
  : 
  Melanella, 
  Bowdich, 
  is 
  emploj'ed, 
  two 
  

   subgenera 
  being 
  accepted, 
  Mehmella, 
  s.str., 
  and 
  Balcis, 
  Leach, 
  1852. 
  

   The 
  former 
  is 
  characterized 
  " 
  Melanellas 
  with 
  straight 
  shells", 
  the 
  

   latter 
  " 
  Melanellas 
  with 
  flexed 
  shells". 
  The 
  diagnosis 
  of 
  Melanella 
  

   reads 
  " 
  Turreted 
  ; 
  spire 
  curved", 
  and 
  the 
  type 
  of 
  Balcis 
  is 
  a 
  straight 
  

   shell 
  and 
  is 
  so 
  included 
  by 
  Bartsch 
  himself. 
  In 
  the 
  Bull. 
  U.S. 
  Nat. 
  

   Mus. 
  No. 
  90, 
  Jan. 
  21, 
  1915, 
  his 
  colleague, 
  Dr. 
  Dall, 
  gave 
  a 
  cursory 
  

   review 
  of 
  the 
  group, 
  writing 
  the 
  facts 
  correctly. 
  

  

  On 
  p. 
  354 
  Bartsch 
  used 
  Lamhertia 
  as 
  of 
  Souverbie, 
  1869, 
  but 
  that 
  

   name 
  was 
  invalid 
  and 
  had 
  been 
  corrected 
  to 
  Hypermastus 
  by 
  Pilsbry 
  

   in 
  a 
  paper 
  quoted 
  elsewhere 
  in 
  this 
  essay 
  by 
  Bartsch. 
  As 
  a 
  matter 
  

  

  