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Show 1891.] THE SHELLS OF I'ERAK. 335 from Japan, China, the Malay Peninsula, to the Philippine Islands and the Malay Archipelago. 25. ? HELIX BOURYI, de Morgan. Helix bouryi, de Morg. Bull. p. 35, t. ii. fig. 3 (Petasia). Mt. Tchora, Kinta valley. The author classes this small snail, 3 m m . irr diameter and height, as a Petasia. I should have thought it to be a form of Naninidce, if the peristome were not described as slightly reflexed. It will prove to be a Satsuma. 26. CHLORITIS PENANGENSIS, Stol. Trachia penangensis, Stoliczka, J. As. Soc Beng. xlih 1873, t. iii. figs. 1, 18-20. Fruticicola penangensis, de Morgan, Bull. p. 36. Bukit Pondong (Hungerford); all over Perak (de Morgan); Penang (Stoliczka). 27. CHLORITIS MALAYANA, V. Molldff. (Plate XXX. figs. 6, 6 a.) Helix (Trachia) malayana, v. Molldff. 1. c. p. 303,-an = Planispira breviseta, Crosse, J, de Conch, xix. 1876, p. 336 (nee Pfr.) ? Perak (Hungerford). 28. CHLORITIS WRAYI, de Morgan. Philidora wrayi, de Morgan, Bull. p. 36, t. ii. fig. 5. Lahat, Ipoh, Kinta valley (de Morgan). 29. CHLORITIS HARDOUINI, de Morgan. Helix hardouini, de Morgan, Le Naturaliste, 1885, p. 68. Philidora hardouini, de Morgan, Bull. p. 37, t. i. fig. 10. Between Lahat and Ipoh, Kinta valley (de Morgan). Both Stoliczka and de Morgan have placed true species of Chloritis into different genera. The former accepted Trachia as a separate genus, and classed H. penangensis, procumbens, Gld., delibrata, Bens., and gabata, Gld., with it ; but whilst he was quite right in establishing a genus for these species, the name Trachia should not have been applied to it. The type of Trachia is H. asperella, Pfr., and the group should be restricted to those Indian species with almost circular apertures and very approximate margins of the peristome, as H. asperella, fallaciosa, Fer., ruginosa, Fer., and others. The chief characteristic of Chloritis is the sculpture, which consists of impressed points, placed in quite regular quincunx, bearing short hairs or setse, always present in young specimens, often also in the adults. Besides this typical sculpture, there is always a keel or angle round the umbilicus which disappears at the basal margin of the peristome, effecting at that place a slight production of the lip. •The general form of the shell is variable, most species showing very 23* |
