1886.] 0. F. von MMendovE-^The LandsJiells of Perak. 307 



rugosuUs minutissime granulata, vii'idescenti-cornea, sjpira breviter conoidea 

 apice mamillari, nitido. Anfr. 4 teretes, ad suturam profundam planati, 

 ultimus ad aiierturam valde descendens, hreviter solutus. Apertura diago- 

 nalis, cirmdaris, peristoma continuum, rectum. Operculum testaceum^ 

 crassum ; peripheria sulco late exaratum, extus valde concavum, margi^ii- 

 bus anfractuum breviter elevatis, anfractus 8 oblique plicato-striati. Diam. 

 maj. 7|, alt. 5 mill. 



Hab. — Ad Buket Pondong, leg. cl. R. Hungerford. 



This species is most probably the same which is mentioned in 

 G. Nevill's Handl. Moll. Ind. Mus., 1878, p. 256, as Oyclotus, n. sp., found 

 at the same locality by Dr. E. Townsend. It belongs to the group of 

 C. pusillus, Sow., hunanensis, Gredl., etc., which Prof, von Martens has 

 jiSiToaedi^ Cycloti suturales (Landschn. Ostas., 1867, p. 124). 



Mr. J. de Morgan describes (1. c, 1885, p. 69) an Aulopoma lowi 

 from the Kinta valley, which I suspect to be a Cyclotus yoyj similar 

 to, if not identical with, the above species. The dimensions are about 

 the same, 8 and 5 mill., and the short description of the ehell agrees 

 very well, especially the remark that the live shell is covered with a 

 layer of mud. This covering seems to be characteristic of the group, as 

 I have observed it, not only in 0. hungerfordianus, but also in all Chinese 

 and Philippine species. The description of the operculum does not in 

 any way point to Aulopoma, hitherto not known out of Ceylon. He 

 calls it circular, horny, composed of lamellae placed one upon another, 

 slightly convex on the inner side. This might fairly well apply to the 

 operculum of a Gyclotus, certainly not to that of an Aulopoma. If my 

 supposition as to the identity of the two species be correct, the question 

 arises whether the rules of priority require that the species should be 

 called Cyclotus lowi, de Morg. I think that the publication of a Cyclotus 

 as an Aulopoma in such an insufficient way that its identity can only be 

 guessed, does not entitle it to priority, but, as this can only be decided 

 after typical specimens of both species have been compared, I have 

 thought it better to publish the species collected by Mr. Hungerford 

 under a new name. 



27. Opisthoporus solutus, Stoliczka. 



Stoliczlca, J. A. S. B., xli, pt. 2,51872, p. 266, t. x, f . 8—10. PfeifPer, Mon. Pneum., 

 suppl. iii, 1876, p. 44. G. Nevill, Handl. Moll. Ind. Mus., 1878, p. 263. H. Crosse, J. 

 de Conch., xxvii, 1879, p. 337. 



Buket Pondong (Dr. Townsend, Hungerford) ; Penang (Stoliczlca)^ ■ 

 28. Opisthoporus penangensis, Stoliczka. 



Stoliczka, 1. c, 1872, p. 265, t. x, f . 7. PfeifEer, Mon. Pnenm., snppl. iii, 1876, 

 p. 43. G. NeviU, Handl., 1878, p. 263. H. Crosse, 1. c, 1879, p. 338. 

 40 



