99 



celeriter accrescentes, teretes, validi; aper- 

 tura plus minus renifomiis. 

 1. Planorbis corneus Linne. 



(Helix Cornea Linn. Syst. Nat. X., 1758, p. 770.) 



Testa crassa, solida, nitidula, transversini sulculis et 

 striis vel costulis irregularibus praedita, obscura, olivaceo- 

 nigrescens, interdum rufescens, subtus pallidior, parum um- 

 bilicata, supra profunde concava; an fr. 4 l / 2 — 5'/ 2 , celerrime 

 accrescentes, teretes, ultimus rugis reticulatis saepius notatus 

 (fossularum seriebus transversis scrobiculatus), inflatus, finem 

 versus ampliatus, utrinque ceteris multo altior, anfractus 

 omnes tantum subtus visibiles, supra primi 2 obsoleti; su- 

 tura subtus profunda, anfractus angulato-truncatos disjun- 

 git; apertura perobliqua, reniformis, intus rufo-brunnea; 

 peristoma simplex, albo-sublabiatum, marginibus ad basin 

 sinulos formantibus, callo tenui junctis; diam. 28, alt. 10, 

 apert. alt. 12 mm. 



Planorbis purpura Müller Verm. Hist. II. (1774) p. 154. 



ß. banaticus Lang Mscr. (teste Bourg. Rev. & Mag. Taf. 3. Fig. 

 de Zool., XL. 1859. p. 516): testa sat parvula, supra in- ^~6. 

 fundibuliformi-umbilicata, subtus planata, subpellucida, ni- 

 tida, vix angustissime striatula, olivaceo-cornea vel rubella; 

 anfr. 5, celeriter accrescentes, rotundati, ultimus magnus, 

 exacte rotundatus, altitudinem penultimi supra multo supe- 

 rans, subtus aequans; apertura vix obliqua, parum lunata, 

 ovali-rotundata, intus tenuissime margaritaceo-labiata; diam. 

 10 — 12, alt. apert. 4 1 / 2 mm. 



Planorbis similis M. Bielz. 



Planorbis transsylvanicus Lang (teste E. A. Bielz). 



Planorbis corneus v. minor E. A. Bielz (testa junior). 



y. ammonoceras Westerl. (Coli. Typ. Moll. Suec, 1868, Taf. 3. Fig. 

 Nr. 94; Expose critique des moll., 1871, p. 124): testa 1— 3 ' 

 magna, crassa, solida, parum pellucida, depressa, tenuiter 

 arcuatim striata, polita, Cornea, supra rufescens vel coeru- 

 lescens, medio late concava, subtus albida vel virescens, 

 subplana; anfr. 6 — 7, celeriter accrescentes, teretes, sat an- 



