20. 617 



Clausilia didyma Parr. in sched. 

 £. Major, purpuieo-nigricans, albo-strigillata, anfr. 10 — H conve- 

 xiusculis, sutura submarginata; long. 13 — 14, diam. 3 — 8^4 

 mill.; ap. 3 niill. longa , 2 lata. 

 Clausilia dubia Drap. Hist. p. 70. t. 4. f. 10? 



— — Desh. in Lam. Hist. VUI. p. 209. N. 28. 



— — Gray Manual p. 216. t. 12. f. 143? 



— rugosa C. Pfr. Nat. I. p. 63. t. 3. f. 30! 



— — Forst. in Nov. Acl. Leop. XIX. P. II. p. 279. 



t. 58. f. 9? 



— — var. Rossm. VU. t. 34. f. 477. 478. 



— crassula Pot. et Mich. Gal. Douai \. p. 180. t. 18. 



f. 9. 10? 



— consocia Ziegl. olim. 



Helix dubia (Gochlodina) Fer. Prodr. N. 541. 

 Andraea diibia Hartm. in sched. 

 ^. Eadem, virenti-hyalina , albina. (Raram legi ad Wilhehiishohe prope 



Gassellam. ) 

 TQ. Eadem ac s (saepe major), hneis impressis, confertis distincte 

 reticulata; long. 15, diam. 3^^ niill.; ap. 3 mill. longa, 2 

 lata. (Spec.) 

 Clausilia undulata Parr. in sched. 

 ^. Eadem ac s, gracihor: 



Clausilia nigidosa Ziegl. Mus. 



— rugosa var. Rossm. VIL t. 34. f. 486? 

 L? Lamella infera distincte cruciatim biramosa (Hartm. ). 



Clausilia cruciata Stud. Verz. p. 20. 



— — Charp. Gat. moll. Suisse p. 17. t. 2. f. 9? 



— plicatida ^ Hartm. in Neue Alpina I. p. 216? 

 Helix cruciata (Gochlodina) Fer. Prodr. N. 542? 



X? Major, remotius striata (Hartm. ). 

 Helix roscida Stud. in Goxe trav. 

 Clausilia roscida Stud. Verz. p. 2 0. 



— plicatula h Hartm. I. c. p. 216. 



Habitat in Europa media dispersa. Formae typicae specimina 

 nonnisi e Britannia possideo; var. p rarior in Germania; y 

 et £ in Gerniania frequentes (circum CasseUdin £ frequentis- 

 sima, rarius intermixta varietatibus Z, et t]; siniiliter in Her- 

 cynia, Styria, etc. ), Helvetia, GaUia, Britannia, Suecia, Buco- 

 vina, etc. 



Obs. 1. Species pervariabilis quoad spiram niagis minusve gracilem, 

 aperturae formam , callum palatalem plicamque inferam magis minusve 

 perfectam , lamellam inferam subsimplicem, biluberculatam vel distincte 

 ramosam, nec non quoad cristas basales magis minusve distinctas; prae- 

 terea interdum plicula interlamellaris adest. 



Obs. 2. Conf. praeterea tentamen, a Gl. A. Schmidt (in Zeitschr f. 



