108 



Planorbis spirorbis Rossmässler Iconogr. I. p. 106. 

 f. 63. Stein Sehn. u. Musch. Berl. p. 75. t. 2. f. 7. Bielz 

 Fauna Moll. Sieb. ed. 2. p. 179. 



Planorbis spirorbis v. ecarinata Jeffreys Brit. Conch. 1. 

 p. 87. 



Planorbis dazuri Westerland Exp. Crit. Moll. p. 130. 



Planorbis dalmatinus Parreyss in ex. 



Hab. ad Leipzig, ad Berlin, multis locis in Tran- 

 sylvania, in Dalmatia, in Croatia (ad Agram), in Britannia 

 prope Swansea. 



Taf. 3. Fig. 9. Planorbis spirorbis Linn. (Helix spirorbis Linne Syst. 



34 - 36 - Nat. X. 1758. p. 770.) 



Testa depressa, utrinque medio plus minus coneava, 

 corneo-fusca vel flavescens, interdum albida, arcuatim stria- 

 tula, nitidula; anfr. 5 — 5^2 > sensim aecrescentes, teretes, 

 utrinque convexi, ultimus major, penultimo dimidiam latior, 

 supra convexus, inferne obsoletius carinato-angulatus, subtus 

 planulatus, ad aperturam extus fascia flavida, intus labio 

 eburneo praeditus; sutura utrinque profunda; apertura 

 parvula, obliqua, rotundata, subangulata; peristoma mar- 

 ginibus lamina tenuissima albida saepius conjunetis. Diam. 

 5 — 6 mm. 



Taf. 3. Fig. 3. major: testa anfr. 6 — 7; diam. 7 — 8 mm. (= PI. 



qy qn ' * 



' septemgyratus Mörch Syn. Dan. p. 61 & Auct. plur.) 

 Habitat sparsim in tota Europa. 



Taf. 3. Fig. 10. Planorbis rotundatus Poir. (Prodr. 1801. p. 93) 



Testa depressa, supra vix coneava, centro impresso, sub- 

 tus plana, corneo-fusca, nitidula, sublaevis, saepe limo obdueta; 

 anfr. 5 — 6^2? tardissime aecrescentes, supra semiteretes, subtus 

 planiusculi, ultimus parum (subtus vix quadrantem) latior, 

 deorsum obtuse angulatus; sutura supra profunda, subtus 

 profundiuscula; apertura parva, obliqua, angulato-rotun- 

 data; peristoma leviter albo-labiatum, marginibus saepius 

 disjunetis; diam. 4 J /2 — 5 mm. 



