Mr. W. H. Benson on new Helicidae. 269 



striae on the under side, and by the compression of the base 

 round the umbihcus. 



As is the case in the Khasia Hills, there are two varieties of 

 Helix plectostoma in size ; but the largest of the Darjiling speci- 

 mens does not equal in volume the small Khasia one which 

 formed the type of my original description. Fresh Khasia spe- 

 cimens are furnished with a scabrous hispid epidermis, as well as 

 the Darjiling varieties. 



9. Helix camura, nobis, n. s. 



Testa anguste umbilicata, conoideo-depressa, oblique rude rugoso- 

 plicatula, sub lente minutissime granulata, subtus Iseviori, trans- 

 lucente, cornea ; spira depresso-conoidea, lateribus planulatis, apice 

 acutiusculo, sutura leviter impressa, junioris niarginata ; anfracti- 

 bus 6^ vix convexiusculis, ultimo compresse carinato, subserrulato, 

 subtus convexo ; apertura obliqua, transversim angulato-Iunata, 

 peristomate tenui, recto, margine basali valde arcuate, columellari 

 expansiusculo. 



Diam. major 22, minor 19, axis 10 mill. 



Habitat in valle Rungun, prope Darjiling, rarior. 



Nota. Junioris carina compressa marginata magis serrulata apparet. 



This shell is allied to H, Tugurium, B., but is distinguished 

 by its more depressed spire, flattened and not subconvex at the 

 sides, its sharper keel, wider umbilicus, and by the roughly de- 

 veloped sculpture, quite unlike the delicately decussated oblique 

 striae of the previously known species, which occurs in the 

 Rungun Valley as well as at Darjiling. 



The young shells of H. camura, with the marginate and serru- 

 late edge of the keel and suture, bear a wonderful resemblance 

 to H, Serrula, B., of the Khasia range, but may be known by 

 the absence of a prominent keel in the upper whorls, by the 

 less developed costulation, the more contracted perforation, the 

 non-exserted apex, the want of expansion and of thickening in 

 the basal margin, and by the less oblique descent of the colu- 

 mellar margin of the aperture, which is moreover less depressed 

 than in H. Serrula, and gives evident tokens of its immaturity. 



10. Helix omatissima, nobis, n. s. 



Testa aperte perforata, subconoideo-depressa, superne oblique con- 

 fertim et arcuatim costulato-striata, subtus laevigata, polita, 

 obsolete radiato-striata, luteo-cornea, infra pallldiore ; spira de- 

 presso-conoidea, lateribus planulatis, apice obtuso, sutura im- 

 pressa submargiuata ; anfractibus 7 arete et lente accrescentibus, 

 convexiusculis, ultimo superne angulato, angulo ad marginem 

 aperturae obsoleto, antice vix descendente, subtus convexo ; aper- 

 tura obliqua, transversim lunata, peristomate recto, iutus vix la- 



