﻿MOLLUSQUES 
  TERRESTRES 
  ET 
  FLUVL\TILES. 
  291 
  

  

  SECTIO 
  XV. 
  

  

  GEOTROCHUS, 
  Hasselt. 
  

  

  sts 
  

  

  51. 
  Hélix 
  trigonostoma, 
  Pfeiffer. 
  

  

  Helix 
  trigonostoma, 
  Pfeiffer, 
  dans 
  Philippi, 
  Ahhildmgen, 
  I, 
  vu, 
  p. 
  i54, 
  pi. 
  IV, 
  fig. 
  8, 
  18/1/1. 
  

  

  Hellx 
  trigonostoma, 
  Pfeiffer, 
  Procced. 
  Zoot. 
  Soc. 
  o/London, 
  pari 
  XIII, 
  p. 
  /ii, 
  i8/i5. 
  

  

  Helix 
  trigonostoma 
  , 
  Chemnitz, 
  éd. 
  nova, 
  p. 
  299, 
  pi. 
  XLIX, 
  fig. 
  10, 
  18/18. 
  

  

  Helix 
  trigonostoma, 
  Pfeiffer, 
  Monog. 
  Heliceonim, 
  vol. 
  I, 
  p. 
  229, 
  18/18. 
  

  

  Helix 
  trigonostoma, 
  Reeve, 
  Conclwl. 
  Iconica, 
  pi. 
  GV, 
  fig. 
  584, 
  i852. 
  

  

  Geotrochus 
  trigonostomus 
  , 
  Pfeiffer, 
  Vers. 
  p. 
  i45, 
  i855. 
  

  

  Geotrochus 
  trigonostomus, 
  Albers, 
  Ueliceen, 
  éd. 
  Martens, 
  p. 
  3i2, 
  1860. 
  

  

  Testa 
  imperforata 
  , 
  coinça, 
  trochiformis 
  , 
  tenuiuscula, 
  suhobhqiie 
  striatula 
  , 
  linets 
  nonnullis 
  concoitrtcis 
  , 
  impres- 
  

  

  notata, 
  alba 
  , 
  fasciis 
  .superne 
  Imearibiis, 
  basi 
  latioribus 
  , 
  fusco-violaceis 
  oriuiia; 
  spim 
  late 
  conica; 
  sutura 
  

   impressa; 
  anjractus 
  â 
  i/a 
  planiusculi, 
  primi 
  1 
  i/a 
  siiblœvigatt 
  , 
  nitiduli, 
  ultimus 
  leviter 
  dcscendens, 
  spiram 
  

   superaiis, 
  obsolète 
  angulatiis, 
  basi 
  subplanatus; 
  apertura 
  subtriangulans 
  , 
  lunato-ovalis 
  , 
  parum 
  obliqua, 
  intus 
  

   albida 
  , 
  fascns 
  anfractûs 
  ultimi 
  transmcantibus 
  ; 
  penstoma 
  simplex, 
  rcjlexum, 
  liicteum, 
  marginc 
  cohmcllnri 
  

   brevi, 
  extus 
  calloso, 
  apprcsso, 
  basali 
  et 
  externo 
  expansis 
  , 
  supero 
  ad 
  insertionem 
  attenuato. 
  

  

  Diain. 
  maj. 
  aj 
  imlL, 
  min. 
  33, 
  ait. 
  18. 
  

  

  Var. 
  (S, 
  luteo-albida 
  (pi. 
  XI, 
  fig. 
  &), 
  paulo 
  minor; 
  anfractûs 
  à 
  Sjâjfasciis 
  linearibus 
  3 
  , 
  fusco-nigricanti- 
  

   bus 
  transversim 
  cincti 
  , 
  punctis 
  mgricantibus 
  , 
  raris, 
  parum 
  conspiciiis 
  , 
  obscure 
  notati, 
  ultimus 
  fasciis 
  ù 
  ornatus, 
  

   Icrtia 
  basali, 
  lata, 
  cjuarta 
  latiore, 
  locum 
  umbihci 
  circumdante 
  ; 
  apertura 
  vix 
  subtriangidaris 
  , 
  lunato-ovalis 
  , 
  

   a 
  Iba 
  , 
  fascns 
  transmean 
  tibus. 
  

  

  Diam.maj. 
  iSmilL, 
  min. 
  ao, 
  ait. 
  iG 
  (Mus. 
  Parisiense). 
  

  

  Var. 
  y, 
  elevato-conica 
  (pi. 
  XI, 
  fig. 
  6a), 
  alba; 
  anfractûs 
  5 
  , 
  fusco-nigricante 
  quadrifasciati 
  , 
  punctis 
  raris- 
  

   simis, 
  obscuris 
  inconspicue 
  notati 
  , 
  ultimus 
  basi 
  late 
  bifasciatus 
  ; 
  apertura 
  lunato-ovalis, 
  alba, 
  fasciis 
  transmean 
  - 
  

   tibus. 
  

  

  Diam. 
  maj. 
  27 
  1/3 
  milL, 
  min. 
  22^ 
  ait. 
  20 
  (Mus. 
  Parisiense). 
  

  

  Var. 
  S, 
  intermedia 
  (pi. 
  XI, 
  fig. 
  6 
  i), 
  striatula, 
  pallide 
  cinereo-lutescens 
  , 
  fasciis 
  linearibus 
  (ultinia 
  majore) 
  , 
  

   sat 
  numerosis 
  , 
  fusco-nigricanlibus 
  cincta, 
  et 
  punctis 
  plurimis 
  irregulariter 
  aspersa; 
  anfractûs 
  5, 
  ultimus 
  imprcs- 
  

   sionibiis 
  obsoletis 
  vix 
  rugulosus, 
  infra 
  peripheriam 
  albidus, 
  basifusco 
  sat 
  late 
  bifasciatus, 
  cinereo-lutescens 
  , 
  

   jiixta 
  aperturam 
  vitta 
  casianea 
  longitudinaliter 
  ornatus; 
  apertura 
  siibanguste 
  lunato-ovalis, 
  alba 
  , 
  fasciis 
  et 
  

   vitta 
  transmcantibus. 
  

  

  Diam. 
  maj. 
  3^ 
  milL, 
  min. 
  22, 
  ait. 
  18 
  (Mus. 
  Parisiense). 
  

  

  Animal 
  lutescens, 
  lateribus 
  griseo 
  longitudinaliter 
  bifasciatis; 
  tentaculis 
  griseis. 
  

  

  Var. 
  s, 
  Salleana, 
  paido 
  major, 
  conica, 
  tenuiuscula, 
  stnatuki 
  et 
  impressionibus 
  obsoletis 
  rugulosa, 
  parum 
  

   nitida, 
  cinereo-lutescens, 
  ad 
  peripheriam 
  fascns 
  a 
  fusco-viridibus 
  et 
  punctis 
  castaneis 
  ornata; 
  anfractûs 
  5 
  vix 
  

   convexiusculi 
  , 
  ultimus 
  lineis 
  impressis, 
  concentricis 
  notatus, 
  subangulatus 
  , 
  basi 
  parum 
  convexus; 
  apertura 
  

   parum 
  obliqua, 
  lunato-ovalis, 
  intus 
  nitida, 
  cdbida, 
  fasciis 
  nigricantibus 
  ; 
  penstoma 
  tenue, 
  expansum 
  et 
  

   refexiusculitm, 
  album, 
  margine 
  columellari 
  superne 
  dilatato, 
  calloso. 
  

  

  Diam. 
  maj. 
  3o 
  milL, 
  min. 
  aâ, 
  ait. 
  ai. 
  

  

  