Mollusques terrestres et d'eau douce. 137 



milatiis, infcrne coiivexiis, fincni versus ampliatiis, ad aperturam sub ra.ar- 

 gine anfr. penultimi depressus; apertura larga, oblique oblongo-rotunda, inar- 

 giuibus coutinuis. 



a Cristatns Drap. Testa tenuissinia, pellucida, albida vel pallide fulva; 

 aiifr. ultimus trausveisiiu subtilissiiiie stiiatus, lateiibus pra'terea co- 

 status, costis in margineni proiiiinentibus, carinani denticulatain red- 

 dunt. Diam. 2 — 2-} mm. 



Nautilus crista Liiiué Syst. Nat. X^ (1758) p. 709. 



Planorbis iinhricatus Müller pr. p. Verm. Hist. II (1774) p. 165. 



Nilsson pr. p. Hist. Moll. Su. (1822) p. 76. 

 Planorhis cristatus Driipiirnaud Hist. Moll. (1805) p. 44. t. 2. f. 1—3. 

 Flanorbis nautileus Friele Norske Moll. (1853) p. 33. Nord, et Nyl. 



Fini. Moll. (1856) p. 66. 

 Planorhis nantilms var. cristata Jeffr. Brit. C'oncli. 1 (1862) p. 82. 

 Plaiiorbis crista a Morcli Syn. Moll. Dan. (1864) p. 54. Westerlund 



Sv. Moll. (18G5) p. 107; Coll. Typ. Moll. Su. (1868) n:o 97. 



a) testa alba, costis iateraiibus extus in aculeos longos, 

 apice acutes, elongatis. 

 ß Nautileus Linn. 'J'csta solidula, vix pellucida, cinerascens vel fuscenti- 

 cornea; atifr. ultimus subtilissime striatus, costis obsoletissimis mar- 

 gine lœvis. Diam. '^ — 4 mm. (ex. max.). 



Turbo 7iautileus Linné Syst. Nat. XII (1767) p. 1241. 



Planorhis imbricatus Draparnaud 1. c. 



P'lanorbis crista ß Westerlund Coll. Typ. (1868) u:0 98. 



Hab. In Suecia per partem raeridioiialem et mediam distributa, 

 liaud rara, sed magnitudiiiis sufe exiguje causa facile praîtervisa species. In 

 prov. Skåne in fossis et stagnis circa Lund et Malmö multis locis, passim 

 frequens; in prov. Blekinge in lacu Herrstorpssjön prope Ronneby et in 

 stagnis ad Carlsbamn (/S maxima); ins. Öland in lacuna et in fossis inter 

 Borgbolm et Kolilstad nee non in rivulo ad Stora Dahlby; ins. Gotland ad 

 Gröttlingbo, Lilnna et in Wallstena-à (Lindström); prov. Småland in pisci- 

 nis extra urbem Kalmar; prov. Westergötland in Stadswassen ad Göte- 

 borg (Malm), ad Mölltorp in Kopparsjön (J. A. Wallin!!); prov. Öster- 

 götland ad Mjölsefall et in Alviken par. Nykil (E. v. Goes!!) nec non in 

 fossis juxta viam inter Wäfversunda et Alvastra; prov. Nerike mnltis locis 

 circa Örebro in amnis et fossis (Hartman); ad Stockholm in Gångsätra 

 kärr in Lidingön (Wikström), in lacu Bomsjön ad Carlberg (Högberg sec. 

 AViKSTRÖM), ad Stora Sickla et Nackanäs (Hartman); prov. Upland ad 

 Upsala (Johanson!, Lilljeborg!); prov. Westmanland ad Westeras et 

 Norberg (Johanson!); prov. Dal ar ne (teste clar. Johanson!). Ubique forma 



Nova Acta Reg. Soc. Se. Ups. Ser. III. 18 



