390 Mr. W. H. Benson on new Helicidse. 



angusds, arete convolutis, planulatis, ultimo supeme convexiusculo, 

 ad peripheriam superne angulato-compresso, subtus convexo ; 

 apertura vix obliqua, late lunari, angustiori, peristomate tenui, 

 acuto, margine basali arcuato, columellari oblique descendente, su- 

 perne breviter reflexo. 



Diam. major 28, minor 25, axis 9 mill. 



Habitat in valle Tenasserim, et ad urbem Mergui, satis frequens. 



A thin Nanina, distinguished at first sight from decussata and. 

 other allies of N. vitrinoides by its more depressed form, flat- 

 tened spire, and more compressed periphery, independently of 

 the great difference between its sculpture and that of H. decus- 

 sata, B. From resplendens, Ph., of the Tenasserim region it is 

 separated by its spread orbicular form, its flatness above, and by 

 its compressed periphery obsoletely angled towards the upper 

 part of the last whorl. A single specimen, not quite fresh, was 

 received for description. 



8. Helix perpauhj nobis, n. s. 



Testa perforata, depresso-globosa, oblique striatula, sub epidermide 

 cornea albida; spira eonoideo-convexa, apice obtuso, sutura im- 

 pressa ; anfractibus 4^ sensim crescentibus, convexiusculis, ultimo 

 rotundato, subtus convexo ; apertura obliqua, rotundato-lunari, 

 peristomate recto, acuto, margine columellari reflexo, suboblique 

 descendente, basali arcuato. 



Diam. major 2, minor If, axis 1 J mill. 



Habitat ad Phie Than, raro. 



Allied to H. Molecula ; but, besides its much smaller size, it is 

 more globose. The single specimen received is much weathered. 

 It is probably translucent and poKshed when fresh. The spire 

 is less conoid, and the whorls not so closely wound as in H, 

 Bullula, Hutton, of the Western Himalaya. 



9. Helix pauxillula, nobis, U.S. 



Testa minute perforata, depressa, striatula, striis confertis minutis- 

 simis spiralibus utrinque ornata, diaphana, nitente, pallide cornea; 

 spira convexiuscula, apice obtuso, sutura profundiuscula ; anfrac- 

 tibus 4 sensim crescentibus, convexiusculis, ultimo subtus convexo; 

 apertura obhqua, sublate lunari, peristomate recto, acuto, margine 

 columellari arcuatim descendente, superne expanso ; periomphala 

 excavato. 



Diam. major 2, minor 1|, axis f mill. 



Habitat ad Thyet Mio, nee raro. 



This minute shell, when examined under the microscope, ex- 

 hibits a beautiful and well-pronounced spiral sculpture, which, 

 in addition to its flatter spire and smaller number of whorls, 

 assists in distinguishing it from the Western Himalayan H. pla- 

 niuscida, Hutton. 



