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



ano-ustis, arete convolutis, planulatis, ultimo superne convexiusculo, 

 ad° peripherlam superne angulato-compresso, subtus convexo ; 

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

 acuto, margine basali arcuato, columellari oblique descendentCj su- 

 perne breviter reflexo. 

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

 Ilabitat 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 resjjkndens, 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 perp aula, nobis, n. s. 



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

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

 pressa ; aufractibus A^ sensim crescentibus, convexiusculis, ultimo 

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

 peristomate recto, acuto, margine columellari reflexo, subobUque 

 descendente, basali arcuato. 



Diam. major 2, minor If, axis 1^ miU. 



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 polished 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, diapbana, nitente, pallide cornea; 

 spira convexiuscula, apice obtuso, sutura profundiuscula ; aufrac- 

 tibus 4 sensim crescentibus, convexiusculis, ultimo subtus convexo; 

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

 columeflari arcuatim descendente, superne expanse ; periomphalo 

 excavato. 

 Diam. major 2, minor \\, 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- 

 niuscula, Hutton. 



