1921] Annandale : Apple-Snails of the Penin.sitla. 195 



Stoliczka's type-series was from Penang, while de 

 Morgan gives the same island and Lariit, Perak, as localities 

 for his A. welleslijen.si.s. The new specimens are from 

 Selangor. 



I think that Nevill was right in treating this form as 

 a variety of P. conica. as some individuals might be 

 assigned either to it or to the forma tijpica of that species 

 with almost equal justice. Only tiie specimens from Bhamo 

 ill Nevill's collection can, hoAvevcr, be assigned to it, those 

 from Tenasserim representing P. gracilis. 



The variety was described from " Malacca." According 

 to Kobelt it occurs in Assam as well as in Upper Burma. 

 The forma ti/pica of P. conica is widely distributed in 

 Burma and has been found in Northern Siam. 



Pachylabra gracilis (Lea). 



1!I2(I. Pachylabra gracilis. Aiinandalp, Journ. Nat. Hist. Soc. Siam, IV (1920), 

 p 11, pi. i, ng. 4. 



The differences between this species and P. 

 conica noted in the paper cited appear to be constant in 

 the fairly large scries now^ before me. The internal 

 colouration of tiie shell also is characteristic (iig. cit.). 

 The largest shell I have seen is 37 mm. high and 31.5 mm. 

 in maximum diameter.. The apex is eroded and the shell 

 has the appearance of being adidt. 



There are specimens in the F.M.S. Museums collection 

 from Penang and the Kinta district, Perak. The 

 species has hitherto been known only from northern Siam, 

 but the shells from Tenasserim labelled A. conica var. 

 compacla by Nevill certainly belong to it. 



Pachylabra perakensis (de Morgan). 



ISS.'). Anipiillaria perakensis, do Morgan, op. cit., p. 418, pi. viil, fig. 12. 



The colouration of the shell is evidently variable. Dc 

 Moi'gan describes it as, " Caerulea, multis croceis faciis 

 ornata," but in the specimens I have examined it is of a 

 bright yellowish olivaceous shade with a few faint darker 

 spiral bands. The shape, high polish of the surface and 

 sculpture of very tine longitudinal costae are, howevei', 

 characteristic. 



De Morgan records the species from the lower Kinta 

 aii<l Plus valleys. There are specimens in the Kuala Lumpur 

 collection from Perak and Selangor and Mr. Boden Kloss 

 recently- sent me one from Benong on the Isthmus of Kra 

 on the Siamese side of the Pakchan river. 



Pachylabra turbinis subampullacea (Nevill) . 



I.SH.'). Ainpiilltirid liirhinis v;ii-. snhampullocea. Nevill, Hand ist Moll. Ind. 



Mils. II, p. tl. 

 1885. Ampiillaria smiKilrensis, de Morgan inec Philippi), op. cit , p. 418. 



1!)aO. PachyUihra liirbinis race siihampnlldctd, Annandale, op. fit . p. 48, pi. i, 

 fig. 7, pi. ii, (ij{. 1. 



