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DESCRIPTION OF UNIO PASANGENSIS, n.sp., FROM THE 

 EIVER PAHANG. 



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



Read 9th June, 1899. 



Unio Pahangewsis. 



Testa elongata, valde ingequilateralis, mediocriter compressa, antice 

 rotundata, postice angustata, subcuneiformis, periostraco fusco induta, 

 lineis incrementi validis striata; valv£e mediocriter crassse, ad apicem 

 erosge, intus in medio dilutissime flavo-salmonese, infra et antice ad 

 marginem caeruleo-albse, postice purpurascentes ; margo dorsi anticns 



Unio Fahangensis, n.sp. 



subdescendens, posticus fere rectus, subhorizontalis, ventralis parum 

 curvatus, antice sursum arcuatus ; cicatrix anterior breviter piri- 

 formis, bene impressa, postica major, superficialis ; linea pallii antice 

 crenulata ; cicatrices pedis muscularum tres insequales ; dentes 

 anteriores duo, quorum superior gracilis, elongatus, interior crassior, 

 rugosus, substriatus, posticus unicus elongatus, rectus ; dens unicus 



