﻿BOYCOTT 
  : 
  ON 
  ACASTHINULA 
  ACULEATA. 
  223 
  

  

  The 
  hermapliroAite 
  duct 
  passes 
  into 
  the 
  substance 
  of 
  the 
  albumen 
  gland 
  

   at 
  the 
  point 
  shown 
  in 
  IID 
  ; 
  it 
  is 
  sharply 
  flexed 
  on 
  itself 
  at 
  the 
  point 
  

   of 
  entry, 
  though 
  whether 
  there 
  is 
  a 
  definite 
  vesicula 
  seniinalis 
  is 
  

   perhaps 
  a 
  question 
  of 
  terminology. 
  The 
  duct 
  of 
  the 
  spennatheca 
  (SP) 
  

   arises' 
  rather 
  low 
  down 
  on 
  the 
  free 
  oviduct; 
  it 
  is 
  long 
  (about 
  r4 
  mm.) 
  

   and 
  for 
  the 
  most 
  part 
  narrow, 
  in 
  its 
  upper 
  part 
  not 
  more 
  than 
  some 
  

   007 
  mm. 
  wide 
  over 
  all. 
  The 
  globular 
  spennatheca 
  lies 
  exceptionally 
  

   high 
  up, 
  being 
  overlapped 
  by 
  the 
  lower 
  ends 
  of 
  the 
  albumen 
  gland 
  

   {AG) 
  and 
  liver 
  (Z). 
  There 
  are 
  no 
  traces 
  of 
  anything 
  like 
  a 
  dart-sac 
  

   or 
  mucous 
  gland, 
  or 
  other 
  accessory 
  organs 
  on 
  the 
  female 
  side. 
  

  

  My 
  findings 
  therefore 
  correspond 
  with 
  those 
  of 
  Wiegmann, 
  whose 
  

   drawing 
  was 
  published 
  posthumously 
  by 
  P. 
  Hesse. 
  ^ 
  Wiegmann 
  adds 
  

   the 
  statement, 
  of 
  which 
  I 
  have 
  not 
  been 
  able 
  to 
  assure 
  myself, 
  that 
  

   the 
  retractor 
  muscle 
  is 
  bifid, 
  making 
  attachment 
  to 
  the 
  appendix 
  as 
  

   well 
  as 
  to 
  one 
  of 
  the 
  horns 
  of 
  the 
  penis. 
  The 
  only 
  detail 
  in 
  which 
  

   my 
  results 
  differ 
  is 
  the 
  relative 
  length 
  of 
  the 
  duct 
  of 
  the 
  spermatheca, 
  

   which 
  I 
  should 
  be 
  inclined 
  to 
  make 
  longer 
  than 
  he 
  does, 
  but 
  this 
  is 
  

   a 
  difference 
  which 
  might 
  be 
  due 
  to 
  dissimilar 
  methods 
  if 
  I 
  am 
  right 
  

   in 
  assuming 
  that 
  he 
  was 
  ingenious 
  enough 
  to 
  arrive 
  at 
  his 
  result 
  by 
  

   gross 
  dissection. 
  

  

  How 
  far 
  these 
  data 
  serve 
  to 
  place 
  aculeata 
  in 
  its 
  correct 
  taxonomic 
  

   position 
  I 
  would 
  not 
  presume 
  to 
  say. 
  The 
  genitalia 
  are 
  certainly 
  

   curious 
  for 
  one 
  of 
  the 
  helicoids, 
  in 
  the 
  absence 
  of 
  mucous 
  glands 
  and 
  

   the 
  presence 
  of 
  a 
  penile 
  appendix 
  ; 
  among 
  our 
  native 
  snails 
  an 
  

   appendix 
  to 
  the 
  penis 
  is 
  most 
  easily 
  seen 
  in 
  Ena,''' 
  and 
  similar 
  

   appendices 
  appear 
  to 
  occur 
  in 
  Pupilla 
  miiscorum, 
  Lauria 
  umlilicata, 
  

   and 
  Vertigo 
  mi^iutissima.^ 
  L. 
  Germain^ 
  includes 
  it 
  in 
  the 
  "Pupidae" 
  

   on 
  the 
  ground 
  of 
  its 
  anatomical 
  characters, 
  which 
  he 
  does 
  not 
  detail. 
  

   The 
  radula 
  is 
  figured 
  by 
  E. 
  W. 
  Bowell,' 
  who 
  suggests 
  a 
  relationship 
  

   to 
  Vertigo 
  for 
  both 
  aculeata 
  and 
  lamellata. 
  How 
  far 
  aculeata 
  is 
  really 
  

   close 
  to 
  lamellata 
  is 
  another 
  question. 
  The 
  radulae 
  (Bowell, 
  loc. 
  cit.) 
  

   are 
  in 
  general 
  similar 
  but 
  with 
  well-marked 
  differences, 
  the 
  shell 
  of 
  

   lamellata 
  is 
  rather 
  peculiar 
  in 
  having 
  no 
  finished 
  peristome, 
  the 
  

   genitalia 
  are 
  incomparable 
  since 
  I 
  could 
  find 
  no 
  male 
  organs 
  in 
  

   lamellata,'' 
  the 
  duct 
  of 
  the 
  spermatheca 
  is 
  relatively 
  much 
  longer 
  in 
  

   aculeata, 
  the 
  "prostate" 
  diff'ers 
  in 
  its 
  relation 
  to 
  the 
  oviduct 
  in 
  the 
  

   two 
  species. 
  Steenberg 
  (loc. 
  cit., 
  p. 
  84) 
  says, 
  but 
  without 
  details, 
  

   that 
  the 
  anatomy 
  of 
  the 
  two 
  species 
  is 
  different, 
  

  

  A 
  hermaphrodite 
  genital 
  apparatus 
  of 
  this 
  kind 
  was 
  found 
  in 
  nine 
  

   out 
  of 
  the 
  twenty 
  specimens 
  examined, 
  but 
  the 
  male 
  parts 
  were 
  

   absent 
  from 
  the 
  other 
  eleven. 
  All 
  the 
  specimens 
  were 
  adult 
  in 
  the 
  

   sense 
  that 
  the 
  shells 
  had 
  a 
  well-finished 
  reflected 
  peristome 
  and 
  rib, 
  

   and 
  were 
  of 
  adult 
  dimensions 
  (about 
  2J- 
  mm. 
  wide 
  and 
  high). 
  Their 
  

  

  ^ 
  Nachrichtsbl. 
  Deutsch. 
  Malak. 
  Gesell., 
  1915, 
  p. 
  56. 
  

   ^ 
  See 
  e.g. 
  J. 
  W. 
  Taylor's 
  figure 
  in 
  Monograph, 
  vol. 
  i, 
  p. 
  361. 
  

   ^ 
  C. 
  M. 
  Steenberg, 
  Danmarks 
  Fauna 
  : 
  Landsnegle, 
  1911, 
  pp. 
  168, 
  170, 
  172 
  ; 
  

   A. 
  Moquin-Tandon, 
  Hist. 
  Nat., 
  vol. 
  ii, 
  1855, 
  p. 
  392, 
  and 
  pi. 
  xxviii, 
  fig. 
  1. 
  

   * 
  Molhcsques 
  de 
  la 
  France, 
  vol. 
  ii, 
  1913, 
  p. 
  190. 
  

  

  = 
  Proc. 
  Malac. 
  Soe. 
  Lend., 
  vol. 
  xi, 
  1914, 
  p. 
  159 
  ; 
  vol. 
  viii, 
  1908, 
  p. 
  127. 
  

   ® 
  Journ. 
  Conch., 
  vol. 
  xv, 
  1917, 
  p. 
  175. 
  

  

  