«58 TESTACEA. 



Germ. die kleine platte schnecke ; das gelblichb 



PLATTE POST- HORNCHEN. 

 Gall. LE PLANORBE A ARETE, , 



diam, i - 5I - 7? Jin. alt. * - | lin. 



7>/7fl plana cornei coloris, pallida, parum flavicans, glabem- 

 ma, pellucida , fubtiliffime transverfim flriata, fupra convcxa, 

 paruni umbilicata , fubtus planiufcula , folo centro aliquantuni 

 cava. JinfraBus quaruor planiufculi, fupra minus convexi, quani 

 in V\.imbHicato.> Q.\um\is imprimis, qui fupra fcnfim vcrfus utrum- 

 <iue latus inclinatur, ac ilatior eil , quam in nmbiUcato ; Carina 

 in mcdio marginis acuti, feu ipfum totuiti margincm occupat, 

 hinc ab utraque pagina confpicua eft j Jlpertura ovato-acuta; 

 margo nempe anfi:a£luima acutiflimus , aperturam Cmul acutam 

 reddit. 



Limax apcrturam & interiores anfra£lus tantum occupat , ex- 

 terior latiflimus ismper vacuus apparet. 



Teftce juniorcs & adulta: omnes, etiam limace foetae , pelluci- 

 dae , carina marginali diftinBae ,- inter complures tamen unicum 

 juniorum fpecimen reperi, omni margine carinato dcftitutum. 



In copula altcr maffim carneam informem a finiftro latere , 

 pone tentaculum 'hoc quinquies craftiorem exfcrtam in apcrturam 

 pallii altcrius infert , ihiquc varie tcntat ; maflii hccc annulato- ru- 

 gofa cft, corporeque limacis pallidior, lumbriciformis, Altcrius 

 genitalis veftigium nullum videre potui. 



In kcubus ac foflis frequens, Itatici noftris majores. 



345. PLANORBIS voRTEx. 



Planorbis tefla flavo - fufca, fubcarinataj fupra 

 concava, fubtus plana. 



Planorbis polygyrata minor. Petiv. gaz, t. 92. f. 6, 



Planorbis 



