22 LIEUT.-COL. H. H. GODWIN-AUSTEN ON [Jan. 6, 



4. On a Collection of Land-Shells made in Borneo by Mr. 

 A. Everett J with Descriptions of supposed new Species. 

 By Lieut.-Col. H. H. Godwin-Austen, F.R.S., F.Z.S., 

 &c. — Part 11.^ Zonitidae and Helicidte. 



[Eeceived January 1, 1891.] 



(Plates II.-VI.) 



It is necessary to limit this second part of my memoir on the 

 Bornean land-shells to those contained in the two families Zonitidae 

 and Helicidse, not including the genera Bulimus, Achatina, &c., for 

 I have not had leisure to examine the species of Stenogi/ra in the col- 

 lection. 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 con- 

 signment 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 consider- 

 able 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 B. 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 interest- 

 ing 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 Microcystina, 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 bave 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, rejiresented by small hehciform 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 



' For Part I., see P. Z. S. 1889, p. 332. 



