1046 MALAYSIAN LAND AND FRESHWATER MOLLUSCA, 



Section Amphidromus. 



BuLiMUS LORICATUS, Pfr. Proc. Zool. Soc. 1854, p. 293; 

 {Amphidromus) Pfr. Vers. p. 147; Mon. Hel IV. p. 372. 

 Java. 



B. PERVERSUs, L.= Helix perversa, L. Syst. Nat. 12tli edit. 

 ►Species, No. 136. 8ub-umbilicate, ovate, oblong, often sinistral, 

 colour vai'ious, but generally uniformly light green, leraon yellow, 

 or white ; or marked variously with spots or bands, such as a deep 

 brown oblique streak, white with red spot, red lip, white lip, 

 variously spotted with a bluish throat. This well-known and 

 widely-spread shell which is found all through the Archipelago 

 (Borneo 1), Malay Peninsula, Moluccas and Burmah, was known 

 to the early conchologists, twelve authorities being quoted by 

 Linnjeus for this species and B. dextra, which is evidently a variety. 

 It is unnecessary to reproduce the authorities which occupy nearly 

 two pages of Pfeiffer's Mon. Hel. (Vol. III. p. 308). It is very 

 common about Malacca, and on wet days especially may be 

 gathered off the leaves of the trees where it is with difficulty 

 distinguished on account of the similarity of its colour. Without 

 quoting authorities, it may be mentioned that it has been known 

 by the following names : — Bulimus, Helix, Limax, Orthostylus, 

 perversa, dextra, sitiistra, atricallosa, iyiterrupta, aurea, citrina, 

 sultana, javanica, macassariensis. 



B. LEUCOXARTHUS, von Mart. = B. leucoxanthus, von Mart. 

 Monatsber. Berl. Ak. 18th July, 1864, p. 526 (Reeve, Bui. f. 187 

 b : dextra.) ; Ostas. Zool. II. p. 348, pi. 20, figs. 11-12 (sioistr.) ; 

 Pfr. Mon. Hel. VI. p. 18. 



Java. 



epidermis differ from the other parts of the upper layer only in having been 

 deprived of, or in never having possessed, the element which gives trans- 

 parency to the membrane ; in the same manner as hydrophanous opal has 

 become white, from the expulsion of its water of crystallization." Reeve, 

 Conch. Icon. Bulimus. 



