Mr. W. H. Benson on iiew svecies q/"Cyclostonia. 187 



rata punctata et lineata, plerumque fascia unica uigrescente con- 

 spicua ad periphaeriam cincta ; spira conoidea, acuta ; anfractibus 

 5 convexiusculis, primis oblique striatis, ultimi periphaeria obsolete 

 angulata ; apertura ampla, circulari, subverticali, marginibus callo 

 tenui junctis ; peristomate expanso, sub-planato-reflexo ; umbilico 

 pervio. Operculo tenui, comeo, multispirato. 



Diam. maj. 30, minor 23, axis 19 mill. ; sp. major. 



Diam. maj. 24, minor 19, axis 14i-mill. ; sp. minor. 



Hab. ad Insulam Penang. Teste Cantor. 



I have thought it advisable to introduce this species here, in 

 order that it may accompany the three preceding species and that 

 immediately following, which, equally with it, belong to the same 

 division of Pfeiflfer's subgenus Cyclophoi-us. The shell forms part 

 of a collection of Penang and Malay species, of which Dr. Cantor 

 entrusted the publication to me, together with some interesting 

 drawings of the inhabiting mollusks, which, I hope, will now 

 shortly see the light. 



5. C. porphyriticum, nobis, n. s. 



Testa mediocriter umbilicata, depresso-conoidea, tenui, striis confer- 

 tissimis distinctis, elevatis, subundulatis, spiraliter mimita, albida, 

 supeme saturate castaneo, subtus pallidiore omata, maculis angu- 

 latis, circa suturam majoribus, conspersa, fasciis saturatis duabus 

 albo-articulatis, altera ad periphaeriam, altera inferiori cincta ; spira 

 brevi, apice acuto, sutura vix distiucta ; anfractibus 4^ planulatis, 

 ultimo angulato, subtus planiusculo ; apertura ampla, ovato-circu- 

 lari, livide albida, peristomate tenui, expanso, reflexo, marginibus 

 callo tenui junctis, conniventibus, columellari angustato, le-^dter 

 emarginato. 



Diam. major 31, minor 2A\, axis 18 mill. 



Hab. in India Orientali. 



Allied to C. aquilum, Sow., but differing in tenuity, depressed 

 form, keel, and sculptui'e. I received this shell from Sowerby, 

 in 1834, as one of the varieties of C. Perdix ; however, the com- 

 pressed fonn of the shell, its sharply sculptured striae, and the 

 characters of the aperture sufficiently justify its separation. In 

 Sowerby's fig. 127, and in Kiister's fig. 7. pi. 8, the columellar 

 lip is expanded above the umbilicus, instead of being narrow and 

 connivent with the superior margin. Sowerby omits any notice 

 of the sculpture, and that which is ascribed to it by Pfeiffer is of 

 a veiy different character. In form C. poiphyriticum somewhat 

 approaches C. zehrinum, mihi, but differs in sculpture, markings, 

 less produced spire, less flattened underside, much wider umbi- 

 licus, and in the absence of the peculiar hispid epidermis which 

 clothes that rare species. Sowerby, in his description of C. ze- 

 brinum, notes the umbilicus as moderate. In my original de- 

 scription (Journ. Asiat. See. Calcutta for 1836), I described it as 



