22 DR- NELSON ANNANDALE ON 



it is pale fulvous with a pinkish tinge and blotched with white ; but 

 this shell appears to be diseased, though the animal in it seems to 

 have been quite healthy. Morlet's description gives the colour as 

 greenish yellow with several obscure spiral bands ; the mouth of a 

 brownish tint with several bands inside, the columellar margin 

 yellowish. Most of the shells I have seen are blackish or 

 olivaceous brown, sometimes with indistinct darker spiral bands. 

 These shells have the peristome reddish and the interior of a dull 

 purple tint. 



The operculum is moderately thick and is less asymmetrical 

 than that of some speceis. The posterior extremity is blunt. Both 

 extremities are somewhat thickened. The external surface is only 

 slightly concave. The smooth area of the scar is narrow and the 

 sculptured border broad and shallow, except at the anterior extre- 

 mity, where it is rather deeply hollowed. The sculpture is obscure 

 and irregular. 



The radula is characterized by the breadth of the larger den- 

 ticulations of the teeth. The central is three times as broad as deep 

 and its central denticulation does not quite reach its base. The 

 latero-basal folds are well-developed, narrow and pointed, the lateral 

 denticulations ill-defined. In the lateral tooth only one lateral 

 denticulation can be distinguished on each side, while in the 

 marginals the outer denticulation is relatively small. 



Measurements (in millemetres) and Proportions of Shells. 



Height 



Maximum diameter 



Height of mouth 



Maximum diameter of mouth 



Maximum diameter to height 



Maximum diameter to height 



of mouth 

 Mouth to height 

 Maximum diameter of mouth 



to maximum diameter ... 1 : 2.5 1 : 2.16 1 : 2.25 1 : 2.16 



The shell is* a little higher than broad and its mouth is 



JOURN. NAT. HIST. SOC. SIAM. 



