jNIr. W. H. Benson on a neiv species of Streptaxis. 187 



angulato ; apertura quadrata, peristomate tenui, acuto, marginc 



columellari, necnon basali, parum expansiusculo. 

 Diam. major 4^, minor 4, axis -4 mill. 

 Habitat ad Teria Ghat, montium Khasiee. 



A pretty little species, distinct in character from any Indian 

 shell yet published, and remarkable for the frequent strong and 

 regular ribs, and for its thread-like carination. 



9. Helia: diplodon, n. s. 



Testa perforata, subgloboso-conica, tenui, laevigata, parum striatula, 

 sub epidermide cornea, albida ; spira convexo-conica, apice obtusi- 

 uscLilo, sutura impressiuscula, margiuulata ; anfractibus 6^ vix 

 couvexiusculis, ultimo acute carinato, non desceudeute, basi con- 

 vexiusculo, antice prope peripheriam planidato-excavato, medio 

 subito tumidiusculo ; apertura obliqua, subhorizontaliter angulato- 

 luuata, intus bideutata, dentibus basalibus 2, 1 subcolumellari 

 obtuso, altero remotiusculo, pliciformi, sinuato, iutrante, peristo- 

 mate superne tenui, acuto, margine columellari ad umbilicum bre- 

 viter reflexo, basali arcuato, expansiusculo. 



Diam. major Q\, minor 5^, alt. 5 mill. 



Habitat iu montibus Khasise, prope Teria Ghat, versus orieutem. 



Easily distinguished from its smaller allies, H. bidenticulata, B., 

 and Pirrieann, Pfr., of Southern India, by the pliciform entering 

 tooth, and by the characters of the base near the aperture; 

 from the former, also, by the absence of the spiral sculpture so 

 conspicuous in that species. 



10. Streptaxis Theobaldi, n. s. 



Testa arcuate rimato-perforata, depressa, oblique pyriformi, valde 

 transversa, tenuistriata, striis ad suturam et ad umbilicum vali- 

 dioribus, albida, nitcnte ; spira convexa, apice prominulo, sutura 

 im.pressa, submarginata ; anfractibus 5^, primis lente accresccnti- 

 bus, antepenultimo ad sinistram subito majori, ultimo tumidulo, 

 parum deviante, antice longe ascendente, basi prope umbihcum 

 compressa, circa peristoma extus triscrobiculata ; apertura sub- 

 triangulari, obliqua, septemdentata, peristomate expanso, reflexo, 

 superne ad angulum valde sinuato, turn antrorsum arcuato, mar- 

 ginibus callo tenui junctis, dextro tridentato, dente tertio majori, 

 basali bidentato, parietali biplicato, plica superiori angulari, prorsus 

 descendente, turn intus transverse producta, inferiori validiori, 

 elongata, flexuosa. 



Diam. major 6, minor 4|, axis 3 mill. 



Habitat ad Nauclai (lat. 2h° 15', long. 92° 30') ; detexit W. Theobald. 



This Khasia species is remarkable for its transverse depressed 

 form, and is only approached in the number of teeth by the 

 Cochin Chinese Str. aberrata, Souleyet. It is one of the smallest 

 species of Streptaxis, and deserves notice as the most north- 

 westerly wanderer of this singular genus. In addition to the 



