GODWIN-AUSTEN : ON DYAKIA STRIATA, VAE. 95 



auatomical grounds they record D. rareguttata under Niinina (Xesia), 

 from the small island of Saleyer, lying otf the south coast, and thus 

 in connection with and through Plores, iSumbawa, and Bali, the 

 extreme eastern limit of its range, as yet known. 



Borneo would appear to be its centre of dispersal, whence it extended 

 westward to the Malay Peninsula and as far as South Siara. It will 

 be interesting to see by what species it is represented in Cambodia 

 and Annam. The same interest apj)lies to another very remarkable 

 genus, Everettia, the type, jucunda (P.Z.S., 1891, p. 33), possessing 

 curious multihd secretory glands on the amatorial organ. The bounds 

 of its distribution are unknown. Wiegmann's researches have shown 

 that it extends to Celebes (see his excellent drawings of Everettm 

 Mollendorffii, Kobelt, pi. xxiv, figs. 1-14), and it is recorded by the 

 brothers iSarasin (Land Moll. Celebes, p. 132). A ^^acie?,, fidvocaniia, 

 Marts., is placed with a doubt in the genus by Wiegmann ; the Sarasins 

 put it into Macrochlamys, which, in spite of the radula being as in that 

 genus, is very doubtful. Its true position cannot be known until the 

 generative organs are seen, and these 1 do not expect will be like 

 those of the typical Indian species ; the shell-lappets are quite unlike, 

 to begin with. 



The Bornean shell consul, Pfr., is undoubtedly an Ecerettia, but 

 I see the Sarasins overlooked this, and in dealing with the distribution 

 of the fauna of Celebes (p. 38), in a comparative list of land shells of 

 Java, Sumatra, and Borneo, consul is put into Macrochlamys, aud its 

 range extended to Sumatra. This requires verification by anatomical 

 examination of the animal. E. consul belongs to a type of shell most 

 difficult to determine by shell character, and it has been recorded 

 from very unlikely habitats, such as Burn, probably from this cause. 

 We now know that very different animals construct very similar 

 shells, particularly those in the family Zouitidse, so that the shells 

 alone become very dangerous and deluding material in the study of 

 present distribution in relation to past geological change. 



The genus Byahia now contains the following nine species, con- 

 clusively shown by the work of Professor F. Wiegmann in his 

 excellent contribution to the Abhandlungen Senckenbergisch uatui'- 

 forsch. Gesellschaft, 1898, vol. xxiv, pp. 287-557, 11 pis., entitled 

 " LandmoUusken (Stylommatophoren) : Zootoniischer Tail," with 

 very accurately drawn plates : — 

 Byahia : 



Rugonis, Pfr., type of the genus. Figured by God wiu- Austen, 



P.Z.S., 1891, pi. V, figs. b-bh. Borneo. 

 Rugonis, Pfr. (?). Figured by Wiegmann, i.e., pi. xxvi, figs. 13-23, 



Borneo. 

 nasuta, Metcalfe. Figured by Godwin-Austen, I.e., pi. v, figs. 4-4^. 



Borneo. 

 Eumphii, V. d. Busch. Figured by Semper, Eeisen, pi. iii, fig, 18, 



Java. 

 rareguttata, Mouss., var. sparsa, Semper, i.e., pi. iii, fig. 17. 



Wiegmann, I.e., pi. x, figs. 16-20; pi. xi, tigs. 1-3. Flores, 



Solor (Wallace). 



