ON SOME NON-MARINE SHELLS FROM THE 

 AUSTRO- AND INDO-MALAYAN REGIONS. 



By E. R. SYKES, H.A., F.L.S. 

 (Plate ix.) 



The forms dealt with in the following paper have come to me from 

 several sources, mainly however, from Herr Fruhstorfer. 



Thanks to the kindness of Mr. Edgar Smith, to whom I owe many 

 thanks for his unfailing help, I have also had the advantage of seeing a series 

 in the possession of the British Museum. 



All the actual "types" are in my own collection. 



Troehoniorpha gulielmi, n. sp. 



PI. ix, figs. II, 12. 



Shell widely and openly umbilicate, depressed conoid, thin, horn colour ; 

 sculpture well-marked lines of growth, cut, on the lower surface, by numer- 

 ous, close-set, miscroscopic spirals; suture well-marked ; whorls 61, regularly 

 increasing, plano-convex, the last whorl not descending, with an acutely 

 angled periphery, base moderately inflated ; mouth subquadrate, lip thin 

 but slightly incrassated on the columellar margin. 



Diani max. 35 ; alt. (from apex to base of last whorl in front) 8 ; diam. 

 max. of mouth 15 millim. 



Haft — Engano. 



Troehomoppha dautzenbergi, n. ^p. 



PL ix, figs. 13, 14. 



Shell moderately and openly umbilicate, subdepressed conoid, rather thin, 

 chestnut-brown ; sculpture lines of growth, obscurely marked on the base by 

 traces of microscopic spirals ; whorls 6^, regularly increasing, flattened, the 

 last whorl not descending and a trifle concave just above the vei-y acute 

 angled peri[)hery, base flattened but a little inflated : mouth sul)quadrate, 

 lip thin but slightly incrassated on the columellar margin. 



Diam. max. 31 ; alt. (from apex to base of last whorl in front) 7 8; diam. 

 max. of mouth 13 millini. 



Hall. — Engano. 



These two handsome forms may be separated by the following charac- 

 ters. In f ijnli''hiii the shell is larger, lighter in colour, more depressed, 

 and the whorls are slighll}- more swollen, and there is an absence of the 

 concavity just al)Ove the perijihery on the last whorl. The sjjiral sculpture 

 on the base is also more marked, and the hase itself is a little more swollen. 

 I have adopted the nauies given to them in MS. by Herr F'ruhstorfer, 



