OF CONCHOLOGY. 



153 



DESCRIPTION OF A NEW GENUS AND ELEVEN SPECIES 

 OP LAND SHELLS, INHABITING POLYNESIA. 



BY W. HARPER PEASE. 



Helix alta, Pease. Plate 12, fig. 1. 



Description. — T. elevata, orbiculo-conica, tenuiscula, imper- 

 forata, epidermide flavido induta ; spira elevata, obtusa ; sutura 

 impressa ; anfr. 6, piano convexis, sublente longitudinaliter 

 striatis, ultimo ad peripheriam acute angulato, basi planiusculus ; 

 apertura transversa, late lunata. 



Dimensions. — Diani. 10, alt. 9 mill. 



Hob. — Insl. Ponape. 



Shell elevated, orbicular, conical, imperforate, covered with a 

 thin yellowish epidermis ; spire obtuse, elevated ; suture slightly 

 impressed ; whorls 6, flatly convex, very finely longitudinally 

 striate, the last sharply angulate at periphery, base flatly con- 

 vex ; lip thin, simple ; columella callous, slightly reflected, 

 white ; aperture transverse, broadly lunate. 



Helix Marquesana, Pse. Plate 12, fig. 2. 



Description. — T. tenuis, orbiculata, imperforata, parum nitida ; 

 anfr. 5, convexiusculis, sublente radiatim striatis, ultimus basi 

 paulo convexior, ad peripheriam rotundatus ; apertura rotun- 

 dato-lunaris ; columella incrassata, vix reflexa, alba ; perist 

 acutum, simplex. Supra flavida, fascia unica rufescente fusca 

 cingulata, basi subviridis. 



Dimensions. — Diam. 9, alt. 7 mill. 



Hah. — Insl. Marquesas. 



Shell thin, imperforate, orbicular, slightly shining ; whorls 5, 

 rather flatly convex, radiately very finely striate, the base more 

 convex, rounded at the periphery ; aperture roundly lunate ; 



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