1891.] THK SHELLS OF I'ERAK. 335 



from Japan, China, the Malaj' Peninsula, to the Philippine Islnnds 

 and the Malay Archipelago. 



25. ? Helix bouryt, 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 mm. in diameter and height, 

 as a Petasia. I should have thought it to be a form of Naninldce, 

 if the peristome were not described as slightly reilexed. It will 

 prove to be a Satsuma. 



2(5. Chloritis penangensis, Stol. 



Trachia penangensis, Stoliczka, J. As. Soc Beng. xlii, 1873, t. lii. 

 figs. 1, 18-20. 



Pruticicola penangensis, de Morgan, Bull. p. 36. 



Bukit VonAon^ {Hung erf urd); all over Perak {de Morgan); 

 Penang {Stoliczka). 



27. Chloritis malayana, v. Molldff. (Plate XXX. figs. G, 

 6 a.) 



Selix {Trachia) malayana, v. Molldff. 1. c. p. 303, — an 



= Planispira breviseta, Crosse, J. de Conch, xix. 187G, p. 33G (nee 

 Pfr.) ? 



Perak {Hung erf ord), 



28. Chloritis wrayi, de Morgan. 



Philidora wrayi, de Morgan, Bull. p. 36, t. ii. fig. i5. 

 Lahat, Ipoh, Kinta valley {de Morgan). 



29. Chloritis hardouini, de Morgan. 



Helix hardouini, de Morgan, Le Naturaliste, 188.5, p. iSS. 



Philidora hardouini, de Morgan, Bull. p. 37, t. i. fig. 10. 



Between Lahat and Ipoh, Kinta valley {de MoryanX 



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, procumhens, 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, Per., and others. The 

 chief characteristic of Chloritis is the sculpture, which consists of 

 impressed points, placed in quite regular quincunx, bearing short 

 hairs or setae, 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 blight production of the lip. 

 The general form of the shell is variable, most species showing very 



23* 



