1891.] THE SHELLS OF PERAK. 339 



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

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



Phaedusajilicostata, de Morgan, Bull. p. 43. 



Bukit Pondong {Townsend, Hungerford). 



The tyi)e was described from Penang. 



40. Clausilia (Pseudonenia) kapayanensis, de Morgan. 

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

 Gounang 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 and 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 an 

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



Fam. AuRicuLiDiE. 



41. Cassidula mustelina, Desh. 

 Prov. of Wellesley {de Morgan). 



42. Cassidula auris-felis, Brug. 



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



43. Auricula auris-judje, Linn. 



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



44. Auricula auris-mid^, Linn. 

 Estuary of Krian river {de Morgan). 



45. Pythia borneensis. Ad. 

 Telok-Anson, Bukit Tambun {de Morgan). 



Fam. LiMN^iD^. 



46. Planorbis exustus, Desh. 

 Wellesley {de Morgan). 



Fam. Cyclophorid^. 



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



Cyclotus hungerfordianus, v. Molldff. I. c. p. 306. 

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

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

 VH t.iif. fig. 6. 



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



