1064 MALAYSIAN LAND AND FRESHWATER MOLLUSCA, 
Pi. alhersi, 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 
more hermetic, suggest a Spiraculum or Rliiostoma ;* but against 
the inclusion in the latter genus, it may be mentioned that the 
last whorl is not fi’ee.” 
Environs of Lahat and Pappan ; Kinta Valley ; Larut. 
I collected three specimens, one on the road between Lahat and 
Hoping, one at the mouth of the Diepang River, and one at 
Pappan, all in Perak. 
S. KiNTANUM, De Morgan, l.c. 1885, p. 69 = Cyclopho7'us 
kintamim, De Morgan, l.c. = Spiraculum kintanuin, O. v. Moll. 
Jour. As. Soc. Beng. LV. p. 308. 
Kinta Valley. 
25. Cyclophorus, Montfort, Conch. Syst. II. p. 290. 
Shell globose, turbinate or depressed and discoid, well umbili- 
cated 3 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 Pfeiffer enumei’ated about 250 species. They are principally 
tropical and Indian, but some of the species are particularly 
characteristic of the Malayan region. 
Cyclophorus conpluens, Pfr. Proc. Zool. Soc. 1860, p. 140; 
Reeve, Conch. Icon. sp. 69, pi. 15 ; Pfr. Mon. Pneumon. Siippl. 
II. p. 60. 
Borneo. 
*It should be noted that in Chenu’s “ Manuel de Couchyliologie ” the 
genus is always written Registoma, possibly Van Hasselt’s genus, the 
etymology of which is pgyg and (rrofia, but the derivation of Rhiostoma 
is from eiov, a promontory. 
