Gray on Balea. 61 



Aiit. IX. On Balea, by Mr. John Edward Ghay. 



Only one species of this subgenus has been noticed by De 

 Ferrussac in his Synopsis, where he has placed it in a section with 

 Turbo elongatus Chemnitz, ix. 112. f. 956, which differs in having 

 the peristome thickened and reflected like the Clausiliae, but has 

 no teeth or clausium. 



Balea. Prideaux Mss. 



Testa spiralis turrita, anfractibus numerosis adpressis paulatim 

 majoribus, axe (columella) perforato : apertura sinistrali peris- 

 tomate incompleto, tenui, labio subuniplicato. 



Testa tenui concentrice obsolete sulcata, epidermide fusca, 

 laevi. 



This subgenus forms a very distinct group in the family of the 

 Helices near Clausilia, from which it differs in the peristome 

 and want of the Clausium. 



1. Balea fragilis. 



Testa sublineari-ovata pellucida flavescente. 



Turbo perversus, Lin. Sys. Nat. 1240. Gmelin. Montagu 

 Test. Brit. 355. Maton Lin. Trans, viii. 181. Dorset. Cat. 51. 

 Turt. Conch. Diet. 226. Dillwyn R. S. i" * 



Pupa fragilis. Drap. Moll. 6 s 



Helix perversa. Ferussac Synop.n. 511. 



Balea lucifuga. Leach Mss. 



Icon. List. An. Ang. t. 2. f. 17 ? Schroet. Einl. Conch, t. 1. 

 f. 5 ? Favanne, t. 65. f. e. 4. Mont. t. 1 1. f. 12 ! Trans. Lin. 

 Soc. viii. t. 5. f. 2 1 Dorset Cat. t. 19. f. 11 . 



Moss at the root of trees, Europe, Great Britain, Mas, Brit. 

 Sowerby, Nostr. 



Shell spiral, nearly linear ovate, turrited, pellucid yellowish 

 whorles many, obsoletely concentrically furrowed, close pressed, 

 gradually enlarging ; columella perforated. Mouth to the left ; 

 peristome incomplete, thin, inner lip when perfect with a small 

 pleatlike tooth near the middle, axis t 3 q, diameter -^ of an inch. 



2. Balea Tristensis. ". . A 



