1064 MALAYSIAN LAXD AND FRESHWATER MOLLUSCA, 



Pi. albersi, Pfr., on account of the curious canaliculated suture. 

 He adds : " De Morgan's mention of a tube, and of the fine 

 membranaceous lamellse of the operculum to render its fitting 

 moi'e hermetic, suggest a Spiraculum or Rhiostoma ;* but against 

 the inclusion in the latter genus, it may be mentioned that the 

 last whorl is not free." 



Environs of Lahat and Pappan ; Kinta Valley ; Larut, 

 I collected three specimens, one on the road between Lahat and 

 Goping, one at the mouth of the Diepang River, and one at 

 Pappan, all in Perak. 



S. KiNTANUM, De Morgan, I.e. 1885, p. Gd = Cyclophorus 

 kintanum, De Morgan, I.e. = Spiraculum kintanum, O. v. Moll. 

 Jour. As. Soc. Beng. LV. p. 308. 



Kinta Yalley. 



25. Cyclophorus, Montfort, Conch. Syst. II. p. 290. 



Shell globose, turbinate or depressed and discoid, well umbili- 

 cated ; peristome entire^ thick, double, and reflected ; periostraca 

 thick ; operculum horny, orbicular, thin, multispiral. 



A large genus, which formerly included nearly 200 species, 

 but has now been sub-divided into several genera. Even after 

 this Pfeifier enumerated about 250 species. They are principally 

 tropical and Indian, but some of the species are particularly 

 characteristic of the Malayan region. 



Cyclopuorus confluens, Pfr. Proc. Zool. Soc. 1860, p. 140; 

 Reeve, Conch. Icon. sp. 69, pi. 15 ; Pfr. Mon. Pneumon. Siippl. 

 11. p. 60. 



Borneo. 



*It should be noted that ia Chenu's " Manuel de Conchyliologie " the 

 genus is always written JRegistoma, possibl}' Van Hasselt's genus, the 

 etymology of which is prj-yr] and (rrofia, but the derivation of Rhiostoma 

 is from eioi/, a promontory. 



