HELIX §. 38. 39. 
191 
ultimus antice vix deflexus, basi convexiusculus; apertura per- 
obliqua, subcircularis; perist. continuum, vix disjunctura, tenue, 
superne rectum, basi breviter reflexum. — Diam. maj. 7, min. 67«, 
ait. 9 mill. (CoII. Nr. 289.) 
Helix turricula Lotae Faun. Mader. p. 58. t. 6. f. 21. 
— — Chemn. ed. II. Helix N. 573. t. 91 . f. 5 — 7. 
Turricula tinricula Beck ind. p. 10. 
Habitat in insula llheo de Cima, juxta ins. Portosancto. 
493. H. thiarella Webb ct Berthelot. 
T. angustissime umbilicata, trochiformis , albo et fusco varie- 
gata, bicarinata, ad suturam tuberculato -plicata; spira conica, 
apice obtusa, cornea; anfr. cy?, ultimus basi conferlira et concen- 
trice granulato-sulcatus , antice angulatim deflexus; apertura sub- 
horizontalis, circularis; perist. expansum, continuum, solutum. — 
Diam. maj. 7, min. C/s, ait. 5 raill. (Coli. Nr. 290.) 
Helix thiarella Webb ct Berth. syn. p. 316. 
— — Orb. canar, p. 62. l. 1. f. 26 — 28. 
— — Chemn, ed. II. Helix N. 576. t. 91. f. 14 — 16. 
Geomitra bicarinata Stans, Malae, p. 166. f. 20. 
Turricula thiarella Beck ind. p. 1 0. 
Ochthephila thiarella Beck ind. p. 1 8, 
Habitat in insulis Canariis et Madera. (In Roccellae sarcinis invenit 
Cl. Terver.) 
§. 39. 
494. H. fbllis Ferussac. •f 
T. imperforata, ovato - conica , albida; spira obtusa; anfr. 
4 convexi, ultimus reliquos longe superans, basi fui vescens et 
cingulis 3 pallide rufis, interruptis ornatus; apertura lunato-ovalis ; 
perist. simplex, acutum, margine columellari subrecte descen- 
dente, dilatato, reflexo, albo. — Diam. 86, ait. 80 mill. (ex ic. 
spec. unici Mus. Paris.) 
Helix follis (Helicogena) Fdr. pr. 19. Hist. t. 17. f. 4. 
Habitat . . . ? 
^^«^495. H. undata Lowe. 
T. imperforata, depresse turbinata, nigricanti -fusca, plicis 
validis undatim corrugata ; spira late conoidea; anfr. sya convexius - 
culi, ultimus antice valde deflexus; apertura ampla, lunato-ovalis; 
perist. superne simplex, marginibus callo tenuissimo junctis , co- 
lumellari dilatato, appresse reflexo, plano. — Diam. maj. 22, 
min. 19, ait. 14 mill, (CoII. Nr. 291.) 
Helix undata. Lowe Faun. Mader. p. 41. t. 5. f. 5. 
