1891.] THE SHELLS OF PERAK. 339 



Hand). Moll. Ind. Mus. 1878, p. 183; H. Crosse, J. de Conch, 

 xxvii. 1879, p. 337; v. Moildff. 1. c. p. 306, 



Phaedusafilicostata, de Morgan, Bull. p. 43. 



Bukit Pondong {Townsend, Hun gei- ford). 



The ty[)e was described from Penang. 



40. Clausilia (Pseudonenia) kapayanensis, de Morgan. 

 Pseudonenia kapayanensis, de Morgan, Bull. p. 43, t. ii. fig. 8. 

 Gonnang Lano {de Morgan). 



De Morgan cites two "genera" of Clausiliidse, Phaedusa and 

 Pseudonenia. To begin with, we have not sufficient reasons as yet 

 to consider Phaedusa to be a separate genus, but even if such were 

 the case, Pseudonenia would anyhow be only a section of Phaedusa, 

 not another genus. The worst of it is that C. filicostata smA penan- 

 gensis, which de Morgan quotes as Phaedusa, belong certainly to 

 Pseudonenia as well as his new species. The latter is, in fact, very 

 closely allied to C . filicostata, especially to its Perak variety ; and I 

 would not hesitate to identify it with the latter, if the author did 

 not speak of a third, "tooth" on the columellar margin, meaning {in 

 emerged columellar lamella, which is not visible in G. filicostata. 



Fam. AuRictfLiD^. 



41. CASStDULA MUSTELINA, Desh. 



Prov. of Wellesley {de Morgan). 



42. Cassidula auris-felis, Brug. 



Bukit Tambun, mouth of Perak river {de Morgan). 



43. Auricula auris-jud^e, Linn. 



Bukit Tambun, Prov. of Wellesley {de Morgan'). 



44. Auricula auris-mid^e, Linn. 

 Estuary of Krian river {de Morgan). 



45. Pythia borneensis. Ad. 



Telok- Anson, Bukit Tambun {de Morgan). 



Fam. LiMNjEiDiE. 



46. Planorbis exustus, Desh. 

 Wellesley {de Morgan). 



Fam. CyclophoriDvE. 



47. Cyclotus (Platyrhaphe) hungerfordianus, v. Moildff. 



Cyclotus hungerfordianus, v. Moildff. 1. c. p. 306. 

 Cyclotus, n. sp., G. Nevill, Handl. 1878, p. 256. 

 ? Aulopoma lowi, de Morgan, Le Nat. 1885, p. 69 ; Bull. p. 59, 

 t. iii. fig. 6. 



The comparison of de Morgan' is figure makes it all but certain that 



