158 Mr. W. H. Benson on new species of Helix. 



further details respecting it, which his eminent attainments and 

 metropolitan opportunities will so well enable him to afford. 



EXPLANATION OF- PLATE VI. 



Fig. 1. Female highly magnified. 



— 2. Male ditto. 



— 3. Very young foetus in the female. 



— 4. Semitransparent ovum with the opake ovum inside. 



— 5. Jaws of the female. The internal parts of the male and female will 



readily be recognized from the descriptions. 



— 6. Ovarium with ova vesicles proceeding from it. 



XV. — Characters of seven new species of Helix, with amended 

 descriptions of some species previously described, and Notes on 

 others requiring remark. By W. H. Benson, Esq., late Bengal 

 Civil Service. 



The following seven species of Helix are not described in the 

 valuable monograph of the genus lately published by Dr. L. 

 Pfeiffer, a work which deserves to find a place in the library of 

 every conchologist. The first volume, besides monographs of 

 several allied genera of less extent, contains the characters of 

 upwards of 1130 species of Helix, inclusive of Nanina and Caro- 

 colla. I have also recast the characters of three of the species 

 described by me in 1836, and included in the monograph, but 

 which Dr. Pfeiffer had not had an opportunity of inspecting 

 when his work was published ; and I have noticed a few points 

 in which correction will be required, where a species has either 

 been twice admitted under different names, or has been founded 

 on the young of a shell belonging to a different genus. 



Other new species of Helix collected in India, at the Cape of 

 Good Hope, and the Mauritius, I hope to describe on a future 

 occasion. 



1. Helix Orobia, nobis, n. s. 



Testa perforata, depresso-globosa, tenuiuscula, radiatim plicato- 

 striata, striis concentricis granulato-decussata, luteo-cornea, 

 fascia infra periphseriam rufo-fusca ornata, versus apicem rufes- 

 cente, basi pallidiori ; spira rotundata, apice planato ; anfrac- 

 tibus h\, superioribus planulatis, ultimo prope suturam tumidiore, 

 periphseria subangulata; apertura subquadrato-lunata, peristo- 

 mate recto, intus late albido labiato ; margine columellari subver- 

 ticaliter descendente, vix reflexo, perforationem subtegente, an- 

 gulum cum margine basali expansiusculo efformante. 



Diam. maj. 35 millim., min. 31. Axis 16 mill. 



Hab. Darjiling regione Sikkim montium Himalayanorum. 



Mus. nost. et Soc. Ind. Orient. Angl. Lond. 



