115 



(Porös) ad monasterium St. Maria" detexit et PL fontinalem 

 nouiinavit. Hunc eundem ac meus PI. malnii esse suspicio. 



V. Armiger Hartm. Testa costulata, saepe mar- 

 gine spinifera; anfr. 3, celerrime accrescentes, 

 supra plani, subtus convexi; apertura rotun- 

 data, marginibus continuis. 



21. Planorbis crista Linn. 



Testa cineraseens, supra plana, subtus umbilicata, stri- 

 ata vel costulata; anfr. 3 — ?> x ji, celerrime accrescentes, primi 

 cylindracei, ultimus pagina supera planulatus, inferne con- 

 vexus, finem versus ampliatus, ad aperturam sub margine 

 anfr. penultimi depressus; apertura larga, obliqua, oblongo- 

 rotundata, marginibus continuis. 



a. Cristatus Drap. Testa tenuissima, pellucida, albida Taf. 4. Fig. 



L g L m ... 25 27 



vel pallide fulva; anfr. ultimus transversim subtilissime 



striatus, lateribus praeterea costatus, costis in marginem pro- 



minentibus, carinam denticulatam reddentibus; diam. 2 — 2 l j 2 



mm. (Nautilus crista Linne Syst. Nat. X. 1758. p. 709. 



Planorbis imbricatus Müller pr. p. Verm. Hist. II. 1774. 



p. 165. Planorbis cristatus Draparnaud Hist. Moll. 1805. 



p. 44. t. 2. f. 1 — 3. Planorbis nautileus Friele, Nord. & Ny- 



lander etc.) 



— spi?iulo$us Clessin (Regensb. Corr. Bl. 1873. p. 121): 

 testa alba, plana, costis lateralibus extus in aculeos 

 longos, apice acutos elongatis (Westerl. Exp. crit. 

 Moll. p. 137.) 



ß. Nautileus Linne. Testa solidula, vix pellucida, ci- Taf. 4. Fig. 

 nerascens vel fuscenti-cornea; anfr. ultimus subtilissime stri- 

 atus, costis obsoletissimis, margine laevis; exempl. max. 

 3 — 4 mm. (Turbo nautileus Linne Syst. Nat. XII. 1767. 

 p. 1241. Planorbis imbricatus Draparnaud Hist. Moll. 

 1805. p. 44.) 



Habitat in Europa fere tota. Terminus borealis ad 

 61—62°. 



8* 



