382 Mr. "VV. H. Benson on new Cingalese Land-Shells. 



convexiusciilis, apice acuto, sutura submarginata, demum impressa ; 

 anfractibus 6^ convexiusculis, ultimo rotundato, ad peripheriam 

 obsolete angulato, autice nou desceudente, subtus convexo ; aper- 

 tura obliqua, rotundato-lunari, peristomate recto, acuto, margine 

 columellari reflexiusculo albido, superne supra perforatiouem pa- 

 tente, breviter reflexo. 



Diam. major 37, minor 33, axis 24 mill, ; apert. longa 1 9, lata 20 mill. 



Habitat ad Pittewelle, pagi Matelle orientalis. 



Its nearest Cingalese ally in form is the little solid H. Gard- 

 neri, Pfr. From H. subdecussata, which occurs at Kaloopanec, 

 in the same district, the adult shell is at once distinguishable 

 by its tumid non-cariuate figure below, the rounded last whorl 

 giving token only of an obsolete angle. There is also a diffe- 

 rence in the decussate granulate spiral sculpture, and in the 

 more convex whorls. A shell from Lagalle, which may possibly 

 be the young of H. Bosamonda, has a carinate periphery ; but 

 -the form is less broad in proportion than that of H. semi- 

 decussata. 



Helix Cyix, B. n. s. 



Testa profunda perforata, depresso-globosa, tenuiuscula, superne 

 oblique et regulariter confertim costulata, lineis impressis spirali- 

 bus remotiusculis subgranulatim decussata, subtus nitida, radiatim 

 striatula, cornea, superne saturatiore, fascia angusta fusca obsoleta, 

 altera latiore pallida, vix conspicua, superne concurrente ad peri- 

 pheriam cingulata ; spira convexo-conoidea, ap'ce obtusiusculo, 

 sutura impressa submarginata ; anfractibus A^ convexiusculis, 

 sensim accrescentibus, ultimo ad peripheriam obtuse angulato, 

 non desceudente, subtus convexo ; apertura obliqua rotundato- 

 lunari, peristomate recto, teuui, infra valde arcuato obtuso, mar- 

 gine columellari arcuatim desceudente, leviter incrassato, superne 

 triangulatim vix expanso. 



Diam. major 23, minor 20, axis 15 mill. 



Habitat in pago Matelle. 



It differs from the t^i^ical H. coriaria, Pfr., in the thinness of 

 the shell, colouring, its regular and delicate sculpture, non- 

 obtect narrow umbilicus, arcuate margin of the columella and 

 base of the peristome, which is more regular in contour, and by 

 the absence of any descent of the last whorl. It is not to be 

 confounded with a small depressed var. of H. coriaria furnished 

 with an angulate periphery, but in other respects corresponding 

 with Pfeiffer^s type, and beariug to it nearly the same relation 

 which the pretty H. alhizonata, Dohrn, does to H. Gardneri, Pfr.* 



It seems to be a characteristic of several Cingalese Helices to 

 have an angulate or carinate ally differing in details of sculpture 



* H. Cyix is allied to H. {Nanina) taprobanensis, Dohrn, page 206, 

 Maliik. Blatter for 185*J, received since this paper went to press, but may 

 be known by its more globose form, less dilated apertiu-e, &c. 



