84 Mr. W. H. Benson on new Species of Helix. 



niajore, ad peripheriam superne subangulato-rotundato, subtus 

 coiivexiusculo ; apertura obliqua, magna, late lunata ; peristomate 

 tenui, aciito, margine dextro superne arcuatim prominente, colu- 

 mellari prope umbilicum breviter dilatato. 



Diam. major 17, minor 14|^, axis 8 mill.; apert. 9^ mill, lata, 

 8 mill, longa. 



Habitat in Insulis Andamanicis. 



A naninoid shell, with the last whorl large in proportion to 

 those of the spire. It has not yet been found in a living state. 

 For the specimens which are most perfect in form I believe my- 

 self to be indebted to the late Superintendent, Dr. Walker. A 

 broken specimen, with the surface in good condition, was trans- 

 mitted by Capt. Haughton. 



Helix Stephus, Bens., n. sp. 



H. testa angustissime perforata, depressa, vix striatula, laevigata, po- 

 lita, translucente, fulva ; spira depresso-conoidea, elevatiuscula, la- 

 tere concaviusculo, apice obtuse, sutura vix impressa, submarginata ; 

 anfractibus 6, vix convexiusculis, lente accrescentibus, ultimo su- 

 pra peripheriam obtusissime angulato, subtus convexo ; apertura 

 obliqua, anguste lunata ; peristomate tenui, recto, subsinuato, 

 marginibus superiore et basali leviter antrorsum arcuatis, columel- 

 lari oblique desceudente, leviter expanso. 



Diam. major 10, minor 9, axis 4| mill. 



Habitat ad Portum Blair Andamanicum. 



Specimens in different stages of growth and condition have 

 been received from the same sources as the last-mentioned 

 species. 



A small shell, with a more depressed spire, five more convex 

 whorls, and a wider aperture than H. Stephus, has been received 

 from (3apt. Haughton. It bears some resemblance to continental 

 Indian types, and has not yet been satisfactorily determined. 



Helix Sanis, Bens., u. sp. 



//. testa niediocriter umbilicata, conoideo-orbiculata, depressissima, len- 

 ticidari, oblique subarcuatim striatula, subgranulata, cornea ; spira 

 parum elevata, conoideo-depressa, apice obtuso, sutura impressius- 

 cula, marginata ; anfractibus 5^, subplanulatis, ultimo carina me- 

 diana acuta utrinque compressa munito, subtus conVexiusculo ; 

 apertura obliqua, securiformi ; peristomate recto, acuto ; umbilico 

 infundibuliformi, 



Diam. major 11, minor 10, axis 3^7 mill. 



Habitat ad Portum Blair Andamanicum. 



Two specimens of this shell have been received from the same 

 sources as H. Choinix. It has close affinity with H Planorbis, 

 Lesson, and H. ZoUirigeri, Pfr., presenting a more depressed 

 form, a dififerent colouring and sculptui'c, and a marginate 

 suture. 



