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Show 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. Phaedusa filicostata, de Morgan, Bull. p. 43. Bukit Pondong (Townsend, Hungerford). The type 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 penangensis, 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. AURICULIDJE. 41. CASStDULA MUSTELINA, Desh. Prov. of Wellesley (de Morgan). 42. CASSIDULA AURIS-FELIS, Brag. 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. LIMNJEID^E. 46. PLANORBIS EXUSTUS, Desh. Wellesley (de Morgan). Fam. CYCLOPHORID^E. 47. CYCLOTUS (PLATYRHAPHE) HUNGERFORDIANUS, V. Molldff. Cyclolus hungerfordianus, v. Molldff. 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's figure makes it all but certain that |