SMITH : NOTES ON THE SPECIES OF PALUDOMUS IN BORNEO. 49 



\ plica principalis ccquans. Long. (spec, fig.) i8-8, la I. 3 millim. 



apert. alt. 3*5, hit. 2.5 millim. Long. (spec, max.) 21, lat. 3 



millim.; apert. alt. 36, lat. 2 "6 millim. 



Hab. : Tongo Mts., Sumbawa (Doherty). 



The name of these mountains appears to be also spelt Dongo. 



but the spelling varies with different authors, as indeed does that of 



nearly all the localities mentioned in this paper. 



The landshells known from Sumbawa are as follows : — 



Nanina rareguitata, Mousson. Also from Bali, Flores, <\rc. 



N. bimaensis, Mousson. ) ,_. . .. , 



, r , , ,, \ I hese appear to be peculiar to Sumbawa. 



N. halata, Mousson. ) 



*N. nemorensis, Mull. Also from Lombok and the Celebes. 



* Amphidromus contrarius. Also from Flores, &c. 



Clausilia recondita. Peculiar to Sumbawa. 



NOTES ON THE SPECIES OF PALUDOMUS 

 INHABITING BORNEO. 



By EDGAR A. SMITH, F.Z.S., 



Zoological Department, British Museum, London. 



Five species of Paludomus from Borneo have already been described. 

 Most of these present a very close family likeness ; indeed, two of 

 them, P. litteus, H. Adams, and P. moreleti, Issel, have already been 

 united by Brot. This author's P. isseli is a little larger, but lacks 

 the fine decussation of the epidermis which is present in luteus. 

 A. broti, Issel, is still larger and remarkable for its globose form and 

 extensive aperture. A. lacunoides, Aldrich, attains even greater 

 dimensions than A. broti, and is distinguished by a peculiar circum- 

 scribed " flattened semilunar space " on the left of the columella, 

 beneath the umbilical region. It also, in young examples, exhibits 

 colour bands, a feature which is not present in other Bornean 

 species. 



A series of specimens presented to the British Museum by 

 Mr. A. Everett, who also collected them in the Batang Lupar 

 district of Sarawak, do not agree exactly with any of the forms 

 referred to, and consequently it seems advisable, notwithstanding 

 their evident relationship with P. isseli and P. lacunoides, to regard 

 them as specifically distinct. 



* I give these on the authority of Dr. O. Boettger, in lift. 



