﻿Mollusca 
  from 
  Peru 
  and 
  Argentina. 
  523 
  

  

  with 
  multitudinous, 
  narrow, 
  spiral 
  bands 
  of 
  the 
  same; 
  

   whorls 
  5, 
  somewhat 
  flattened, 
  regularly 
  increasing, 
  sculptured 
  

   ■with 
  radiate, 
  transverse 
  striae 
  and 
  extremely 
  fine 
  and 
  closely- 
  

   set, 
  rather 
  wavy, 
  microscopic, 
  spiral 
  strise 
  ; 
  suture 
  impressed 
  ; 
  

   base 
  of 
  shell 
  not 
  very 
  convex, 
  sculptured 
  as 
  on 
  the 
  spire 
  ; 
  

   umbilicus 
  wide 
  ; 
  columella 
  margin 
  obliquely 
  descending, 
  

   curved 
  below, 
  diffused 
  above 
  into 
  a 
  restricted, 
  well-defined, 
  

   whitish, 
  parietal 
  callus 
  which 
  reaches 
  to 
  the 
  upper 
  margin 
  of 
  

   the 
  labrum 
  ; 
  labrum 
  simple 
  acute, 
  receding 
  below, 
  a 
  little 
  

   projecting 
  in 
  front 
  ; 
  aperture 
  broadly 
  and 
  rather 
  compressedly 
  

   and 
  obliquely 
  subluuate. 
  

  

  Alt. 
  3*25, 
  diam. 
  maj. 
  7'25, 
  diam. 
  min. 
  6*25 
  mm. 
  

  

  Aperture: 
  alt. 
  2"5, 
  diam. 
  2*25 
  mm. 
  

  

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

  

  Ammonoceras 
  rosenbergiana, 
  sp. 
  n. 
  

  

  Shell 
  allied 
  to 
  A. 
  piicayaensis, 
  Preston, 
  but 
  of 
  a 
  pale 
  

   yellowish-olive 
  tint, 
  with 
  no 
  trace 
  of 
  spiral 
  colour-bands, 
  the 
  

   spire 
  is 
  rather 
  more 
  exserted, 
  and, 
  while 
  the 
  spiral 
  striae 
  aie 
  

   even 
  finer, 
  the 
  transverse 
  strige 
  are 
  much 
  more 
  pronounced; 
  

   the 
  suture 
  is 
  narrowly 
  margined 
  below, 
  which 
  is 
  not 
  the 
  case 
  

   in 
  A. 
  pucayaensis, 
  the 
  last 
  whorl 
  descends 
  somewhat, 
  the 
  

   umbilicus 
  is 
  much 
  narrower, 
  and 
  the 
  parietal 
  callus 
  is 
  of 
  a 
  

   reddish 
  hue. 
  

  

  Alt. 
  3'5 
  (nearly), 
  diam. 
  maj. 
  7, 
  diam. 
  min. 
  6'25 
  mm. 
  

  

  Aperture: 
  alt. 
  2'75, 
  diam. 
  2*25 
  (nearly) 
  mm. 
  

  

  Hah. 
  E,io 
  Pucaya, 
  Eastern 
  Peru. 
  

  

  BuUmulus 
  api'cepunctata, 
  sp. 
  n. 
  

  

  Shell 
  fusiform, 
  reddish 
  brown, 
  variegated 
  with 
  oblique, 
  

   transverse, 
  cream-coloured 
  bands 
  ; 
  whorls 
  6^, 
  not 
  very 
  con- 
  

   vex, 
  regularly 
  increasing, 
  the 
  last 
  rather 
  long, 
  the 
  first 
  two 
  

   and 
  a 
  half 
  regularly 
  spirally 
  punctate, 
  the 
  remainder 
  smooth, 
  

   but 
  for 
  transverse 
  growth-lines 
  ; 
  suture 
  impressed, 
  narrowly 
  

   margined 
  below 
  with 
  white 
  ; 
  base 
  of 
  shell 
  shouldered 
  

   round 
  the 
  umbilicus, 
  umbilicus 
  somewhat 
  broad, 
  deep 
  ; 
  

   columella 
  margin 
  vertically 
  descending 
  in 
  a 
  slight 
  curve, 
  

   thin, 
  broadly 
  outwardly 
  expanded, 
  diffused 
  above 
  into 
  a 
  

   light, 
  well-defined, 
  parietal 
  callus, 
  which 
  enters 
  the 
  shelljust 
  

   behind 
  the 
  upper 
  margin 
  of 
  the 
  labrum 
  ; 
  labrum 
  whitish, 
  

   outwardly 
  expanded 
  at 
  the 
  base, 
  a 
  little 
  bent 
  inwards 
  over 
  

   the 
  aperture 
  above 
  ; 
  aperture 
  rather 
  elongately 
  ovate. 
  

  

  Alt. 
  17*5, 
  diam. 
  maj. 
  9, 
  diam. 
  min. 
  7 
  mm. 
  

  

  Aperture: 
  alt. 
  7*75, 
  diam. 
  3*75 
  mm. 
  

  

  Hab. 
  Santa 
  Kita, 
  E. 
  Peru. 
  

  

  