﻿526 
  Mr. 
  H. 
  B. 
  Preston 
  on 
  neio 
  

  

  Alt. 
  8'5, 
  diam. 
  maj. 
  16, 
  diam. 
  min. 
  13 
  mm. 
  

   Aperture 
  : 
  alt. 
  6, 
  diam. 
  6"5 
  mm. 
  

   Uab. 
  Eastern 
  Peru. 
  

  

  Helicina 
  lacerata, 
  sp. 
  n. 
  

  

  Shell 
  turbinately 
  conic, 
  bright 
  yellow 
  ; 
  whorls 
  4i, 
  slightly 
  

   inflated, 
  regularly 
  increasing, 
  the 
  last 
  acutely 
  carinate 
  at 
  the 
  

   periphery, 
  sculptured 
  with 
  moderately 
  closely-set 
  spiral 
  liroe, 
  

   very 
  obliquely 
  crossed 
  by 
  minute, 
  confused, 
  scratch-like 
  

   striae 
  ; 
  suture 
  lightly 
  impressed, 
  very 
  narrowly 
  callously 
  

   margined 
  above; 
  base 
  of 
  shell 
  sculptured 
  with 
  irregular, 
  tine, 
  

   wavy, 
  revolving 
  liras, 
  considerably 
  confused 
  by 
  the 
  oblique 
  

   scratch-like 
  stria3 
  which 
  are 
  also 
  present 
  on 
  this 
  portion 
  of 
  

   the 
  shell 
  ; 
  columella 
  mai'gin 
  whitish, 
  descending 
  in 
  a 
  gentle 
  

   curve, 
  thickened 
  at 
  the 
  base 
  into 
  a 
  slight 
  nodular 
  concretion, 
  

   spreading 
  outwards 
  and 
  upwards 
  into 
  a 
  thin, 
  ill-defined, 
  

   granular 
  parietal 
  callus 
  ; 
  labrum 
  yellow, 
  outwardly 
  expanded, 
  

   reflexed, 
  and 
  receding 
  below, 
  projecting 
  above, 
  where 
  it 
  ceases 
  

   to 
  be 
  reflexed 
  ; 
  aperture 
  obliquely 
  subrectangular, 
  rounded 
  at 
  

   the 
  base 
  ; 
  operculum 
  horny, 
  dark 
  chestnut, 
  shading 
  to 
  pale 
  

   red 
  in 
  the 
  median 
  and 
  nucleal 
  regions, 
  yellowish 
  towards 
  the 
  

   base 
  on 
  the 
  inner 
  margin, 
  slightly 
  concave, 
  granular, 
  lamini- 
  

   ferous, 
  with 
  lateral 
  nucleus. 
  

  

  Alt. 
  6, 
  diam. 
  maj. 
  8, 
  diam. 
  min. 
  7 
  mm. 
  

  

  Aperture 
  : 
  alt. 
  3"75, 
  diam. 
  3*75 
  mm. 
  

  

  Hab. 
  Rio 
  Pucaya, 
  Eastern 
  Peru, 
  at 
  an 
  altitude 
  of 
  250 
  feet. 
  

  

  HeUcina 
  syngenes, 
  sp. 
  n. 
  

  

  Shell 
  allied 
  to 
  //. 
  lacerata, 
  Preston, 
  but 
  rather 
  more 
  

   broadly 
  conic 
  in 
  shape 
  and 
  lacking 
  the 
  inflation 
  of 
  the 
  whorls 
  ; 
  

   it 
  is 
  also 
  of 
  a 
  pale 
  flesh-colour; 
  the 
  lirse 
  on 
  tlie 
  spire 
  and 
  

   base 
  of 
  //. 
  lacerata 
  give 
  place 
  in 
  the 
  present 
  species 
  to 
  coarse, 
  

   closely-set, 
  spiral 
  strise, 
  while 
  the 
  basal 
  columellar 
  nodule 
  is 
  

   wanting. 
  

  

  Alt. 
  6, 
  diam. 
  maj, 
  9, 
  diam. 
  rain. 
  7*5 
  (nearly) 
  mm. 
  

  

  Aperture: 
  alt. 
  3'75, 
  diam. 
  3*75 
  mm. 
  

  

  Hah. 
  Hio 
  Pucaya, 
  Eastern 
  Peru, 
  at 
  an 
  altitude 
  of 
  250 
  feet. 
  

  

  Helicina 
  pucayaensis, 
  sp. 
  n. 
  

  

  Shell 
  globosely 
  turbinate, 
  greenish 
  grey, 
  covered 
  with 
  a 
  

   thin, 
  hispid, 
  light 
  brownish 
  periostracum 
  ; 
  whorls 
  4^, 
  the 
  

   upper 
  whorls 
  flattened, 
  the 
  last 
  inflated, 
  the 
  embryonic 
  whorl 
  

  

  