﻿70 
  PROCEEDINGS 
  OF 
  THE 
  MALACOLOGICAL 
  SOOIETr. 
  

  

  Tlie 
  known 
  recent 
  species, 
  which 
  are 
  but 
  ten 
  in 
  number, 
  with 
  

   two 
  marked 
  varieties, 
  are 
  as 
  follows 
  : 
  — 
  

  

  MouuM, 
  Bolten, 
  1798. 
  

  

  Mortm, 
  J. 
  F. 
  Bolten, 
  Mus. 
  Boltenianura, 
  1798, 
  p. 
  53, 
  Type, 
  

  

  31. 
  pm-piireum, 
  Bolt. 
  = 
  Stro>nhis 
  oniscus 
  (L.), 
  Gmelin. 
  

   Lamhidium, 
  Link., 
  Beschreib. 
  Natural. 
  -Samml, 
  IJniv. 
  Rostock, 
  1807, 
  

  

  p. 
  112. 
  

   Oniscia, 
  Sowerby, 
  Genera 
  Shells, 
  gen. 
  xxiv, 
  1824. 
  

   Oniscidia, 
  Sowerby, 
  Malac, 
  1840, 
  p. 
  299. 
  Type, 
  0. 
  cancellata, 
  Sow. 
  

   Ersina, 
  Gray, 
  " 
  Syn. 
  Brit. 
  Mus., 
  1840 
  " 
  ; 
  Grav, 
  Proc. 
  Zool. 
  Soc. 
  Lond., 
  

  

  XV, 
  1847, 
  p. 
  137. 
  

   Herculea, 
  Hanley, 
  in 
  H. 
  & 
  A. 
  Adams, 
  Gen. 
  Recent 
  Moll., 
  ii, 
  1858, 
  

  

  p. 
  621. 
  Type, 
  0. 
  ponderosa, 
  Hanley. 
  

   Plesio7iiscia, 
  P. 
  Pischer, 
  Man. 
  de 
  Conch., 
  1884, 
  p. 
  G60. 
  Type, 
  

  

  0. 
  tuberculosa, 
  Sow. 
  

  

  § 
  Plesioniscia, 
  p. 
  Fischer, 
  1884. 
  

   1. 
  Ilorum 
  tuherculostim, 
  Sow. 
  

   Oniscia 
  tuberculosa, 
  G. 
  B. 
  Sowerby 
  (first 
  of 
  the 
  name), 
  Gen. 
  Shells, 
  

   1824. 
  

   ,, 
  ,, 
  lleeve, 
  Conch. 
  Icon., 
  v, 
  Aug. 
  1849, 
  pi. 
  i, 
  figs. 
  5, 
  6. 
  

  

  Var. 
  xanthostoma, 
  A. 
  Adams. 
  

  

  Oniscia 
  xanthostoma, 
  A. 
  Adams, 
  Proc. 
  Zool. 
  Soc. 
  Lond., 
  1853, 
  p. 
  174. 
  

   ,, 
  tuberculosa. 
  Reeve, 
  I.e., 
  fig. 
  ba. 
  

  

  Hab. 
  — 
  Gulf 
  of 
  California 
  and 
  Gallapagos 
  Isles 
  (tlie 
  variety). 
  

  

  I 
  can 
  see 
  no 
  structural 
  difference 
  in 
  xanthostoma; 
  simply 
  a 
  

   brilliant 
  colour 
  variety 
  with 
  yellow-orange 
  lip, 
  columellar 
  area, 
  and 
  

   interior 
  of 
  aperture. 
  The 
  section 
  Plesioniscia 
  was 
  never 
  properly 
  

   characterized 
  by 
  Paul 
  Fischer. 
  

  

  2. 
  Mbrum 
  oniscus 
  (Linn.). 
  

  

  Stromhiis 
  oniscus, 
  L., 
  Syst. 
  Nat., 
  12th 
  ed., 
  1767, 
  p. 
  1210. 
  

   Morum 
  purpureum, 
  Bolten, 
  Mus. 
  Bolt., 
  1798, 
  p. 
  53. 
  

  

  ,, 
  oniscus, 
  H. 
  & 
  A. 
  Adams, 
  Gen. 
  Recent 
  Moll., 
  i, 
  1853, 
  p. 
  219. 
  

   Oniscia 
  oniscus. 
  Reeve, 
  Conch 
  Icon., 
  v, 
  pi. 
  i, 
  fig. 
  1. 
  

  

  ITab. 
  — 
  Jamaica 
  and 
  other 
  AYest 
  Indian 
  Islands. 
  Florida 
  Keys 
  

   (H. 
  Hemphill) 
  and 
  others. 
  I 
  myself 
  found 
  it 
  abundantly 
  at 
  Key 
  

   West, 
  upon 
  the 
  coral 
  reefs 
  to 
  the 
  south 
  of 
  the 
  island, 
  in 
  March-April, 
  

   1872. 
  

  

  Var. 
  lamarclcii, 
  Desli. 
  

  

  Oniscia 
  lamarchii, 
  Deshayes, 
  Anim. 
  s. 
  Vert., 
  x, 
  1844, 
  p. 
  12. 
  

   ,, 
  oniscus, 
  Reeve, 
  Conch. 
  Icon., 
  v, 
  Aug. 
  1849, 
  fig. 
  1. 
  

   Seems 
  only 
  to 
  differ 
  from 
  the 
  normal 
  form 
  in 
  the 
  pale-pink 
  lip 
  

   and 
  columellar 
  area. 
  The 
  shell 
  is 
  usually 
  slightly 
  larger, 
  and 
  has 
  

   a 
  more 
  " 
  finished 
  " 
  appearance. 
  This 
  must 
  not 
  be 
  confounded 
  with 
  

   the 
  0. 
  lamarchii, 
  Lesson, 
  which 
  is 
  an 
  unidentified 
  species. 
  

  

  