1021.) B. Pkashad : Sumatrau Molluscs. 479 



named javensis. The latter, as Boettger has shown, is the same 

 as magnifica, Dunker. The other authors, cited in the references 

 above, have followed v. Martens who agreed with Reeve's con- 

 clusions in his first paper, but in igio consideveA suinairensis as 

 worthy or varietal rank. Kobelt in his recent work included A. 

 linnaci with others in the synonym of P. ampullacea, but was 

 doubtfully inclined to consider the iorm?, sumatrensis , celebcnsis anii 

 magnifica as worthy of varietal ranks^ a conclusion with which T 

 agree. Of these var. celebcnsis represents the forma typira. These 

 three forms may be distinguished as follows :— 



1. Sliell globose-ovate, scarcely rimate, spire more 



than I of the total length with the whorls 



increasing evenly in size, aperture narrower [bensis). 



\.\-\^n \n ihe va.T. sumatyensis -, ... foiinn fypica\=cele- 



2. Shell globose, narrowly umbilicate, spire about 



\ of the total length btit with the whorls rapid- 

 ly increasing in size, aperture rather broad vnr. stniinfrensis. 

 ;;. Shell subglobose. cotT)paratively larger than in 

 the other two forms, very narrowh' umbilicate. 

 spire short, less than J of the total length, 

 whorls rapidly increasing in size but less pro- 

 nounced than in the other two forms, aperture 

 oblong, about twice as long as broad ... var. magnifcc. 



Specimens of the forma typic:i (==^-celebensis) are represented 

 from fresh-water areas near Perbaoengan and from rice-fields near 

 the same place, also from the Kroeeng Seunara (Sabang). A few 

 dry shells from Perbaoengan are labelled as coming from the 

 mangrove-swamp region near Perbaoengan, where they were prob- 

 ably carried with the current. 



Specimens of the sumatrensis form weie all collected in fresh- 

 water areas near Medan. 



There are three specimens from Talaiig Koeda which I assign 

 doubtfully to the var. magnifica. It is impossible to identify these 

 specimens definitely as all of them are young, and have not devel- 

 oped the characters of the fully-grown adults. 



Family Vivip.arid.ae. 



Genus Vivipara, Lam. 



This genus is represented in the collection by three species, 

 T'. sumatrensis, V . javanica artd the new species described here as 

 T'. hendrici. 



Vivipara sumatrensis (Dunker). 



t8.^2. Paliidina sumaii-ensis, DunUer. Zeitschy. Malakozool . p. 128. 



18(14. Paliidina sumatrensis. Reeve, Condi. Icon, XIV, pi. x, sp. 65a, b, 



1S75. Paliidina sumatrensis (in part), More:\et, .Ser. Conchyliol. IY,pp. 

 3o4-.^o6. 



rS85. Paliidina beiigalensis sabsp. polygramma (in parti, Nevill, Hand- 

 List Moll. Ind. Mils. II, p. 22. 



i8g6. Paliidina sumatrensis, Schepmann, Notes Le\den Miis. XV'll, 



p. ISQ- 

 1897. Vivipara sumatrensis, v. Martens, op. cit., p. 24, pi. x. 



