270 Mr. W. H. Benson on nezv Helicidse. 



biato, margine basali arcuato, aiitrorsum leviter projecto, breviter 



expaiisiusculo. 

 Diam. major 16, minor 14, axis 8 mill. 

 Habitat ad Pankabari (1000 ped. alt.), prope Darjiling. 



The handsome and regular sculpture of this shell on the 

 upper side, contrasted with the smoothness and polish of the 

 lower side, together with the angularity of the rather highly 

 placed periphery (as in the typical H. decussata, B.), are notice- 

 able features. It inhabits the Sikkim portion of that narrow 

 and lengthened unhealthy tract which stretches along the base 

 of the lower Himalaya from Bhotan nearly to the Sutlej, and 

 which is known throughout by the appellation of " Terai." 



11. Helix sequax, nobis, n. s. 



Testa perforata, subconoideo-depressa, fere tenui, oblique striatula, 

 sub lente coiifertissime spiraliter obsolete striata, nitida, diaphana, 

 livide olivaceo-cornea ; spira depresso-conoidea, lateribus couvexi- 

 usculis, apice obtuso, sutura impressa, subcanaliculato-margiuata ; 

 anfractibus b\ convexiusculis, sensim accrescentibus, ultimo antice 

 (setate) vix descendeute, ad peripheriam compresse rotuudato, 

 subtus convexiusculo, medio excavato ; apertura obliqua, transver- 

 sim lunata, peristomate tenui, recto, margine basali arcuato, co- 

 lumellari bre\dter reflexo. 



Diam. major 18, minor 15, axis 7 mill. 



Habitat copiose ad Darjiling et in valle Rungun (7000 et 4000 ped. 

 alt.). 



Several years ago, a series of specimens was sent to me by 

 Mr. Robert Trotter, with other fine species procured by him at 

 Darjiling, and described in former Numbers of the ^Annals.' 

 The shell rarely attains the extreme size noted; and, from its 

 fragility, the lip is seldom perfect. A livid greenish olivaceous 

 tint is observable in most specimens, which, with the slight 

 concavity of the sides of the spire, serves to distinguish the 

 species at the first glance from others of the type of Nanina 

 vitrinoides, Desh. Mr. W. T. Blanford found it at elevations 

 varying from 4000 to 7000 feet, and states that it is also met 

 with at the foot of the Kbasia Hills; but I cannot find a speci- 

 men, among the immature Naninoid shells received from that 

 quarter through Mr. Theobald, which can be with certainty 

 assigned to this form. 



12. Helix Patane, nobis, n. s. 



Testa perforata, subconoideo-depressa. teimi, fragili, radiatim rugoso- 

 striatula, nitidula, diaphana, lutescente-curnoa ; spira depresso- 

 conoidea, apice nitido, hyalino, obtuso, sutura impressa ; aufractibns 

 5 convexiusculis, lente accrescentibus, ultimo antice leviter descen- 

 deute, ad peripheriam rotundato-compresso, subtus convexiusculo, 



