﻿COOKE 
  : 
  ON 
  EADUr.A 
  OF 
  ACANTHINA. 
  11 
  

  

  18'S9. 
  Iftonoceros 
  pimctahim. 
  Gray, 
  Zoology 
  Beecliey's 
  Voyage, 
  p. 
  124. 
  

   1846. 
  M. 
  functatum, 
  Gray: 
  Reeve,' 
  Couch. 
  Icon., 
  Monoceros, 
  sp. 
  2. 
  

  

  2. 
  AcantTiinucella 
  um'carinata^ 
  (Sowerhy). 
  

   1835. 
  M'inoceros 
  unicanfiaitim, 
  Sowerby, 
  Proc. 
  Zool. 
  Soc. 
  Loud., 
  

  

  p. 
  50. 
  

   1835. 
  M.unicarinatum, 
  Sowerby, 
  Conch. 
  Illust., 
  sp. 
  14, 
  pi. 
  Ixxxi, 
  f. 
  5. 
  

   1837. 
  Purpura 
  (Jtlonoceros) 
  engonata, 
  Conrad, 
  Journ. 
  Acad. 
  !Nat. 
  Sci. 
  

  

  Philad., 
  vii, 
  p. 
  264, 
  pl. 
  xx, 
  f. 
  17. 
  

   1837. 
  P. 
  {Monoceros) 
  hrevidens, 
  Conrad, 
  Journ. 
  Acad. 
  Is^xt. 
  Sci. 
  

  

  Philad., 
  vii, 
  pp. 
  264-5. 
  

   1846. 
  Monoceros 
  tmicarinatiim, 
  Sowerby: 
  Peeve, 
  ^ 
  Conch. 
  Icon., 
  

  

  Monoceros, 
  sp. 
  1. 
  

  

  3. 
  Acanthinucella 
  paucilirata 
  (Stearns). 
  

   1872. 
  Monoceros 
  panciliraia, 
  Stearns, 
  Aiuer. 
  Journ. 
  Conch., 
  vii, 
  

   p. 
  167, 
  pl. 
  xiv, 
  f. 
  16. 
  

   At 
  a 
  distance 
  from 
  these, 
  and 
  close 
  to 
  Papana, 
  will 
  come 
  — 
  

  

  Subgenus 
  Neorapana, 
  n. 
  

  

  1. 
  Neorapana 
  muricata 
  (Broderip). 
  

  

  1832. 
  Purpura 
  muricata, 
  Broderip, 
  Proc. 
  Zool. 
  Soc. 
  Lond., 
  p. 
  125. 
  

  

  1833. 
  P. 
  trtmcata, 
  Duclos, 
  Mag. 
  Zool., 
  pl. 
  xxii, 
  f. 
  2. 
  

  

  1835. 
  Monoceros'^ 
  tnierculafnm, 
  Sowb. 
  (Gray 
  MS), 
  Conch. 
  Illust., 
  

   sp. 
  15, 
  ])]. 
  Ixxxii, 
  f. 
  9. 
  

  

  2. 
  Neorapana 
  grandis 
  (Sowerby). 
  

  

  1835. 
  Monoceros 
  grande, 
  Sowb. 
  (Gray 
  MS.), 
  Conch. 
  Illust., 
  sp. 
  7, 
  

  

  pl. 
  Ixxix, 
  f. 
  l-\a. 
  

   1835. 
  Purpura 
  gr 
  ay 
  i, 
  Kien., 
  Iconographie, 
  Purpura, 
  p. 
  109, 
  pl. 
  xxviii, 
  

  

  f. 
  74. 
  

   1839. 
  Monoceros 
  grandis. 
  Gray, 
  Zool. 
  Beechej-'s 
  Voyage, 
  p. 
  124. 
  

  

  ^ 
  Reeve 
  unfortunately 
  reverses, 
  in 
  error, 
  the 
  numbers 
  denoting 
  the 
  figures 
  of 
  

   bis 
  species 
  1 
  and 
  2, 
  unicarinatiun 
  and 
  '' 
  punctatum^\ 
  

  

  ^ 
  Blainville's 
  Purpura 
  spirata 
  (Nouv. 
  Annales 
  Museum 
  Paris, 
  i, 
  1832, 
  p. 
  252, 
  

   No. 
  105, 
  pl. 
  xii, 
  fig. 
  8) 
  has 
  been 
  generally 
  accepted 
  as 
  a 
  large 
  variety 
  of 
  

   engonata, 
  and 
  would 
  take 
  precedence. 
  Certainly 
  the 
  figure 
  is 
  remarkably 
  

   like 
  engonata. 
  But 
  the 
  description 
  makes 
  one 
  hesitate: 
  " 
  Les 
  premiers 
  

   [tours] 
  sont 
  cordonnes 
  par 
  des 
  series 
  decurrentes 
  de 
  squames, 
  le 
  dernier 
  

   seulement 
  strie 
  ; 
  ouverture 
  ovale, 
  subcanaliculee 
  . 
  . 
  . 
  cinq 
  denticules 
  au 
  

   bord 
  droit; 
  couleur 
  brune 
  en 
  dehors, 
  d'un 
  blanc 
  violet 
  en 
  dedans. 
  Cette 
  

   jolie 
  espece 
  nous 
  paroit 
  parfaitement 
  distincte 
  de 
  toutes 
  celles 
  qui 
  com- 
  

   posent 
  aujourd'hui 
  le 
  genre 
  Pourpre, 
  principalement 
  par 
  la 
  difference 
  de 
  

   travail 
  que 
  presentent 
  les 
  tours 
  de 
  la 
  spire 
  a 
  la 
  surface." 
  He 
  does 
  not 
  

   mention 
  the 
  spine, 
  which 
  certainly 
  becomes 
  obscure 
  in 
  some 
  forms 
  of 
  the 
  

   species, 
  and 
  his 
  description 
  of 
  the 
  surface 
  markings 
  does 
  not 
  accord 
  with 
  

   engonata. 
  Nor 
  do 
  the 
  five 
  tubercles 
  inside 
  the 
  outer 
  lip. 
  Nor 
  the 
  locality 
  

   (Sandwich 
  Is.). 
  

  

  ^ 
  An 
  examination 
  of 
  a 
  fine 
  series 
  in 
  the 
  Natural 
  History 
  Museum 
  from 
  

   St. 
  Elena, 
  W. 
  Colombia 
  (M.C.), 
  shows 
  conclusively 
  that 
  the 
  " 
  species" 
  is 
  

   a 
  variety 
  of 
  muricata 
  in 
  which 
  the 
  tubercles, 
  instead 
  of 
  being 
  scaled 
  and 
  

   running 
  into 
  one 
  another, 
  are 
  long, 
  separate, 
  and 
  considerably 
  smoother 
  

   than 
  in 
  the 
  typical 
  form. 
  

  

  