﻿GUDE 
  : 
  O^i 
  HELICODONTA 
  HISPANICA, 
  N.SP. 
  

  

  125 
  

  

  closely 
  ribbed, 
  the 
  ribs 
  regularly 
  curved 
  and 
  becoming 
  more 
  distant 
  

   on 
  the 
  last 
  quarter-whorl. 
  Spire 
  depressed, 
  apex 
  prominent, 
  suture 
  

   «liallow. 
  Whorls 
  5\, 
  a 
  little 
  rounded 
  above, 
  flattened 
  below, 
  obtusely 
  

   angulated 
  above 
  the 
  periphery, 
  increasing 
  slowly 
  and 
  regularlj^, 
  the 
  

   last 
  ascending 
  a 
  little 
  in 
  front. 
  Aperture 
  crescent-shaped, 
  oblique, 
  

   margins 
  distant, 
  united 
  by 
  a 
  very 
  thin 
  callus 
  on 
  the 
  parietal 
  wall, 
  

   which 
  is 
  finely 
  granulated. 
  Peristome 
  curved, 
  scarcely 
  thickened, 
  

  

  reflexed, 
  livid 
  ; 
  upper 
  margin 
  a 
  little 
  arcuate 
  at 
  the 
  junction 
  with 
  the 
  

   shell-wall, 
  curved 
  slightly 
  forward, 
  then 
  suddenly 
  receding, 
  basal 
  

   nearly 
  straight, 
  columellar 
  receding 
  a 
  little 
  at 
  first, 
  then 
  curved 
  

   forward, 
  triangularly 
  dilated 
  longitudinally, 
  and 
  impinging 
  upon 
  the 
  

   umbilicus, 
  which 
  is 
  deep 
  and 
  cylindrical. 
  Diam. 
  maj. 
  11, 
  min. 
  10 
  mm.; 
  

   alt. 
  5 
  mm. 
  

  

  Hob. 
  — 
  Valencia, 
  Spain. 
  

  

  Type 
  in 
  my 
  collection. 
  

  

  \ 
  

  

  