17 



DESCEIPTION OF REAPEAULUS PERAKENSIS, n.sp., WITH A 

 LIST OF THE KNOWN SPECIES OF THE GENUS. 



By Edgah a. Smith, F.Z.S., etc. 



Read \2th November, 1897. 



The species about to be described formed part of a series of land and 

 fresb-water sbells from tbe Malay Peninsula sent to tbe British Museum 

 (Natural History) by Mr. L. Ray, jun., tbe Curator of the Perak 

 Museum. Most of tbe specimens were in poor condition, but several 

 represented species new to tbe national collection. 



Rhaphaulus Peeakensis, n.sp. 



Testa pupoidea, anguste umbilicata, fusco-purpurea, costulato-striata; 

 spira superne conoidea, ad apicem obtusa ; anfractus 6, convexi, 

 penultimus gibbosus, ultimus minus convexus, pone oblique valde 

 descendens ; apertura intus purpureo-f usca ; peristoma album, in- 

 crassatum, anguste expansum et reflexum ; tubulus albus, a sutura 

 pone labrum deorsum curvatus. Long. 18-5, diam. 9 mm.; apertura 

 intus 5 mm. lata. 



iZa^.— Maxwell's Hill, Larut, Perak. 



\ 



I, II. Rhaphaulus Perakensis, u.sp. 

 Ill, IV. — : Lorraini, Pfr. 



Tbis species is very closely allied to R. Lorraini of Pfeiffer, from 

 Penang, but differs in tbe following respects : — 



It is larger, and tbe body-wborl is ratber longer and more obliquely 

 descending behind. The chief difference, however, consists' in the 

 sutural tube being curved, longer, and directed downwards and away 

 from the peristome, whereas in R. Lorraini it is shorter and directed 

 upwards above the suture. At first I was inclined to think that 

 possibly it might have been broken off short by accident, but a careful 

 examination under the microscope seems to show that such is not the 

 case. The peristome in both species, under a high power, has a very 

 pretty appearance, being marked with minute wrinkled striae. 



VOL. III.— APRIL, 1898. 2 



