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Show 22 LIEUT.-COL. H. H. GODWIN-AUSTEN ON [Jan. 6, 4. On a Collection of Land-Shells made in Borneo by Mr. A. Everett, with Descriptions of supposed new Species. By Lieut.-Col. H. H. GODWIN-AUSTEN, F.R.S., F.Z.S., &c.-Part II.1 Zonitidse and Helicidse. [Eeceived January 1, 1891.] (Plates 1I.-V1.) It is necessary to limit this second part of my memoir on the Bornean land-shells to those contained in the two families Zonitidee and Helicidae, not including the genera Bulimus, Achatina, &c, for I have not had leisure to examine the species of Stenoggra in the collection. Since submitting the first part I have received, through the kindness of Mr. J. Whitehead, all the shells he collected in Borneo and Palawan. I have also had placed in my hands a second consignment from Mr. Everett since his last return to Borneo. Both of these collections contain examples of new species, particularly the last mentioned, for the shells in it had been obtained by Mr. Hose, when collecting orchids in the mountains of the interior of Borneo, in quite new ground. This last collection will also add a considerable supplemental list to my paper on the operculated shells of Borneo already published. I have also to thank Mr. Aldrich of Cincinnati, for sending me examples of the new species which he obtained from Borneo through Mr. Doherty, some of which Mr. Aldrich had already described. A Diplommatina, referred by him to D. concinna, I find to be a new species, which I have recently described and figured as D. aldrichi (see Ann. Mag. N . H . ser. 6, vol. vi. p. 246, pi. vii. fig. 3). The examination of these shells has brought out several interesting facts connected with the distribution of genera. It has extended the range of some, up to the present exclusively Indian genera, thus far to the eastward. For instance, the genus Microcyslina, first described from the Nicobar Islands by Morch, and there and in the neighbouring Andaman Islands represented by three species, has now been found in Borneo, represented by four species. They are small glassy shells, with a peculiar twisted columellar margin, which readily distinguishes them from other similar-looking shells. This genus has not been found either in the Eastern Himalaya or the Khasi Hill-ranges, both of which have been well worked, neither as yet in Pegu or in Upper Burmah. However, in this last-named country vast areas exist which have never been systematically searched, so that species of the genus may very likely be found in the mountainous country between Burmah, Tenasserim, and Siam. Durgella is another genus that we find ranging thus far to the eastward, represented by small heliciform delicate glassy shells ; the anatomy and the odontophore of the Bornean species are precisely similar to those of a species found in the Khasi Hills, and of another 1 For Part I., see P. Z. S. 1889, p. 332. |