MOLLUSQUES TERRESTRES ET FLUVIATILES. 
291 
SECTIO XV. 
GEOTROCHUS, Hasselt. 
51 . Hélix trigonostoma, Pfeiffer. 
Hélix uigono^loma, Pfeiffer, dans Philippi, Abbildungen , I, vu, p. i 54 , pi. IV, fig. 8, i8A/i. 
Hélix trigonostoma, Pfeiffer, Proceed. Zool. Soc. of London, pari XIII, p. /ii, i 845 . 
Ueliv trigonoslotna , Clietiinilz, ed. nova, p. 299, pl. XLIX, lig. 10, i 848 . 
Hélix trigonostoma, Pfeiffei’, Moiiog. Helkeonim, vol. I, p. 999, i 848 . 
Hélix trigonostoma, Reeve, Cotichol. Iconica, pl. GV, fig. 684 , 1862. 
Geolrochns irigonosloimis , Pfeiffer, Feî's. p. i 45 , i 865 . 
Geolrochm Irigmmtonm , Ailiers, llelicecu, éd. Maliens, p. .812, 18C0. 
Testa impcrforata, conica, Iroclnformis , tcrmiiiscula, suboblitjue slnalula, Imeis mnnulUs concentricis , Impres- 
sts notata, alba, fasciis superne linearibus, busi Inlioribus , fusco-violacets ornata; spira Lite comca; sutura 
impressa; anjractus à 1/2 plartiusculi , primi i ijs sublævigati, nittcluU, idtimus ïeinter dcscendens , spiram 
superans, obsolète angulatus, basi subplanatus; apertura subtruingularis , luHato-ovnlls, parum oblûjua, intus 
albida, fasciis anfraclûs ultiini transmeantibus ; peristoma simplex, rcjlexmn, Lwleum, margine cobrmellari 
brevi, extus ealloso, appresso, basali et externo expansis , siipero ad insertionem attenuato. 
Diam. maj. 27 milL, min. 22,, ait. 18. 
Yar. j 2 , lutco-albida (pl.Xl, fig. G), patdo niinor; anfractus i Sj/t, fasciis linearibus a , fusco-nigricanli- 
bus transversim cincti , pimctis nigricantibus , raris, parum conspicuis, obscure notati, idtirnus fasciis ù ornalus, 
tcrtia basali, lata, quarta latiore, locum umbihci circumdante; aperhira vix subtriangularis , Innato-ovalis, 
alba, fasciis transmeantibus. 
Diam. maj. aSniilL, min. ao, ait. 16 (Mus. Parisiense). 
Var. y, elevato-conica (pl. XI, fig. ()«), alba; anfractus B , fusco-nigricante quadrifasciati, punctis raris- 
simis, obscuris inconspicue notati , ultmiis basi Lite bifisciatus ; apertura lunato-ovalis , alba , fasciis Iransmean- 
tibus. 
Diam. maj. 27 1/2 mdl., min. aa, ait. ao (Mus. Parisiense). 
Var. S, intermedia (pl. XI, fig. G b), striatula, pallide cinereo-luteseens, fasciis linearibus ( ultima majore j , 
sat numerosis , fusco-nigricantibus cincta , et punctis plurimis irregulariter aspcrsa; anfractus B, ultimus impres- 
sionibus obsoletis vix rugulosus, infra peripheriam albidus, basi fusco sut Lite bifisciatus, cinereo-liitescens , 
ju,xta aperturam vitta castanen longitudinaliter omnlus; apertura subangustc lunafo-nvalis , alba , fasciis et 
vitia transmeantibus. 
Diam. maj. 27 mill., min. aa, ait. 18 (Mus. Parisiense). 
Aninud lutescens, lateribus griseo longitudinaliter bifasciatis; tenlaculis griseis. 
Yar. s, Salleana, paulo major, conica, lenuiuscida, striatula et impressionibus obsoletis rugulosa, parum 
nitida, cinereo-lulesccns , ad peripheriam fasciis a fusco-viriâibus et punctis castaneis ornata; anfractus B vix 
convexiusculi , ultimus lineis impressis, concentricis notalus, subangulatus , basi parum convexus; apertura 
parum obliqua, lunato-ovalis, intus mlida, albida, fasciis nigricantibus; peristoma tenue, expansum et 
reflexiusculum, album, margine columellari supenie ddatato, ealloso. 
Diam. maj. 3 o mili, min. a^i, ait. a>t. 
37. 
