106 



boreali et Suecia media (prov. Upland.) Terminus borealis 

 ad 62-63°. 



Taf. 3. Fig. 6. Planorbis vorticuhis Troschel. (De Limnaeaceis 1834. 



22 " 24 - p. 51.) 



Testa (subfossilis alba, nitidula), depressa, subcircula- 

 ris, supra plana vel anfractu ultimo ceteros paullulum supe- 

 rante, subtus late concaviuscula; anfr. 5, lente accrescentes, 

 utrinque convexi, sutura' profundiuscula separati, ultimus 

 cylindraceus (sutura et peripheria parallelis), ad aperturam 

 ne quidem minime dilatatus et vix supra l /3 penultimo latior, 

 utrinque convexus (supra altior), margine obtusissimo, infra 

 cavitatem multo et prorsum superans, saepe depresso-cylin- 

 draceus; apertura subobliqua, deflexa, ovalis, (externe ro- 

 tundata, interne subcordata), marginibus callo sat valido 

 junctis. Diam. exempl. maj. 4 (4 l /s) mm. 



Taf 3. Fig. ß. chartern Held. (Isis 1837. p. 305): testa depressa, 



' supra plana vel convexiuscula, spira plana, subtus concava, 

 fusco-flavida ; anfr. 5 — -5 ^2, primi convexi, ultimus penul- 

 timo paullo latior, utrinque aeque convexiusculus, medio 

 subacute carinato-marginatus; sutura utrinque subprofunda; 

 apertura ovalis, externe obtusa, basi subcordata, margi- 

 nibus callo saepe sat valido junctis; diam. 5 — 7 mm. 



Taf. 3. Fig. 7- baoaricus mh.: testa depressissima, utrinque in me- 



28 — 30. dJQ v i x conspicue concaviuscula, lutescens, tenerrima, mi- 

 croscopice striatula, pellucida; anfr. 5 6, primi convexi, 

 ultimus penultimo vix duplo major, ad suturam sat prae- 

 ruptus, utrinque aeque convexiusculus, medio carinatus, 

 membrana debili sat alta undique cinctus; sutura utrinque 

 aeque profundiuscula; apertura ovalis, externe breviter 

 acuta, basi cordata, mai'ginibus disjunctis; diam. 5 (rare 

 6) mm. 



Habitat Forma a in turfosis submarinis ad fines meri- 

 dionales summos peninsulae scandinavicae subfossilis; ad 

 Berlin olim teste clar. Troschel, rarissime visa. ß. chart. in 

 Lombardia, Bavaria et Germania boreali. y. in Bavaria. 



