﻿Descriptions 
  of 
  Neiv 
  Species 
  and 
  Varieties 
  of 
  the 
  Land 
  Shells 
  

   o/ 
  Jaaiaica, 
  ivith 
  Notes 
  on 
  some 
  pretnously 
  described 
  Species. 
  

   By 
  C. 
  B. 
  Adams, 
  Professor 
  of 
  Zoology 
  in 
  Amherst 
  College, 
  

   Massachusetts, 
  Read 
  April 
  21, 
  1851. 
  

  

  The 
  writer 
  has 
  recently 
  spent 
  some 
  time 
  in 
  Kingston, 
  Ja- 
  

   maica, 
  in 
  arranging 
  the 
  land 
  shells 
  of 
  that 
  island, 
  which 
  are 
  

   in 
  the 
  collections 
  of 
  the 
  Honorable 
  Edward 
  Chitty, 
  and 
  in 
  se- 
  

   lecting 
  from 
  them 
  materials 
  for 
  tlie 
  proposed 
  monograph 
  of 
  

   Jamaica 
  shells. 
  Among 
  them 
  are 
  several 
  new 
  species 
  and 
  va- 
  

   rieties, 
  which 
  have 
  recently 
  been 
  obtained 
  by 
  Mr. 
  Chitty, 
  and 
  

   which, 
  with 
  some 
  previously 
  known, 
  are 
  described 
  in 
  this 
  

   article.* 
  

  

  Cyclostoma 
  Hillianum, 
  var. 
  leporilabre. 
  This 
  variety 
  

   is 
  distinguished 
  by 
  having 
  an 
  abrupt 
  reflection 
  of 
  a 
  small 
  part 
  

   of 
  the 
  outer 
  peritreme 
  next 
  above 
  its 
  contact 
  with 
  the 
  penult 
  

   whorl. 
  The 
  outer 
  peritreme 
  is 
  also 
  very 
  much 
  expan.led, 
  and 
  

   is 
  somewhat 
  sinuate 
  above. 
  

  

  Cyclostoma 
  spinulosum 
  (p. 
  1 
  of 
  Contributions 
  to 
  Conch.) 
  is 
  

   perhaps 
  identical 
  with 
  C. 
  lincinellum^ 
  Lam., 
  if 
  we 
  may 
  judo^e 
  

   from 
  the 
  figures 
  of 
  Lamarck's 
  species 
  in 
  Kuster's 
  " 
  Cyclosto- 
  

   macea." 
  

  

  Cyclostoma 
  Moussonfanum. 
  Shell 
  short, 
  globose-conic 
  : 
  

   dingy 
  white, 
  with 
  numerous 
  more 
  or 
  less 
  interrupted 
  spiral 
  

   reddish 
  brown 
  lines: 
  with 
  more 
  or 
  less 
  crowtlcd 
  transverse 
  

   subimbricate 
  lamellae, 
  which 
  are 
  decussated 
  by 
  nuinerous 
  

   small 
  spiral 
  ridges, 
  with 
  the 
  intersections 
  well 
  developed 
  into 
  

   spines 
  in 
  the 
  angle 
  of 
  the 
  suture: 
  spire 
  with 
  very 
  convex 
  out- 
  

   lines; 
  apex 
  usually 
  truncate 
  with 
  the 
  loss 
  of 
  two 
  whorls; 
  re- 
  

   maining 
  whorls 
  three 
  and 
  one-half, 
  very 
  convex 
  ; 
  last 
  whorl 
  a 
  

   little 
  detached 
  from 
  tlie 
  penult 
  whorl 
  near 
  the 
  aperture, 
  but 
  

  

  * 
  This 
  and 
  the 
  following 
  articles 
  were 
  prepared 
  bj 
  the 
  writer 
  while 
  in 
  Kiug>ton 
  

   MAY, 
  1851 
  6 
  

  

  