HELICOSTYLA. 191 



Sub-gen. polymita, Beck (Plnedra, Alters). 



Shell imperforate or perforate, globose, shining ; spire short, 

 last whorl large, defiexed at the aperture ; aperture contracted ; 

 columella dilated at the base ; peristome simple, obtuse, inter- 

 nally labiate, the margins joined by a callus ascending on the 

 columella. 



gallopavonis, Yalenc. tenuistriata, Dkr. 



gilva, Ferns. 1'roscheli, Pfeiff. 



muscarum, Lea. varians, Mke. 



nemoralina, Petit. versicolor, Bom. 

 picta, Born. 



Genus HELICOSTYLA, Ferussac. 



Shell imperforate, globose-conical, often covered with a 

 deciduous, hydrophanous epidermis ; spire elevated, apex 

 very obtuse, whorls 4 8 ; columella solid, arcuately ascend- 

 ing from the broad callous base; aperture ovately lunar, 

 nearly longitudinal, margins equal ; peristome expanded, 

 rarely, shortly reflexed. 



Syn. Orustia, March. 



Ex. H. undulata, Ferussac, pi. 77, fig. 5. Shell, H. 

 mirabilis, Ferussac, fig. 5, a. 



The whole of the species are from the woods in the inte- 

 rior of the islands of the Phillippine Archipelago. 



Species of Helieostyla. 



annulata, Sow. Butleri, Pfeiff. 



balteata, Sou-. collodes, Sow. 



Bruguieriana, Pfeiff, dim era, .Tonus. 



Buschi, Pfeiff. fenestrata, Sow. 



