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



It is a case in which we must " lump " all the various forms, 

 considering them as variations of one and the same species, or else 

 divide them up as best we may. Unfortunately there is a difficulty 

 which is constantly confronting the systematic zoologist. A gigantic 

 "lumping" is unphilosophic, but a too minute "splitting" is still 

 worse. The " happy medium " is perhaps the safest course to tread, 

 our decisions being the result of (as far as we can accomplish it) our 

 careful and candid judgment. The Bornean species of Pabidomus 

 are as follows :— 



1. Paludomus lacunoides, Aldrich. 



P. lacunoides., Aldrich. Journ. Cincinnati Soc. Nat. Hist., 1889, 

 vol. xii., p. 23, pi. iii, figs. i-ic. 



Hab. : Borneo. 



The exact locality is not stated by Mr. Aldrich, but from the 

 introductory remarks to his paper it is probable that this species 

 occurs at the South-eastern part of the island. 



2. Paludomus broti, Issel. 



P. broti, Issel. Ann. Mus. Civ. Storia Nat., 1874, vol. vi., 

 P- 455> P'- vii, figs. 19, 20. 



P. broti, Brot. Conch. Cab. {Paludomus), p. 32, pi. vii, figs. 12, 12a. 

 Hab. : Sarawak. 



3. Paludomus isseli, Brot. 



P. isseli, Brot. Op. cit., p. 31, pi. vii., figs. 7, 7a, 8. 



Hab. : Sarawak. 



This species was founded on specimens which Issel originally 

 referred to the Indian P. crassus, to which it bears a very close 

 resemblance. 



4. Paludomus luteus, H. Adams. 



P. luteus, H. Adams. Proc. Zool. Soc, 1874, p. 585, pi. Ixix, 



figs- 5: 5^- 



p. luteus, Brot, partim. Op. cit., p. 46, pi. viii., figs. 11, iia. 



Hab. : Borneo. 



Distinguished by its yellow decussated epidermis, and the slightly 

 convex whorls being without any depression or constriction below 

 the suture. 



5. Paludomus moreleti, Issel. 



P. moreleti, Issel. Op. cit., p. 456, pi. vii., figs. 21, 22. 



P. luteus, Brot, partim. Op. cit., p. 46, pi. viii., figs. 14, 15. 



Hab. : Sarawak (Doria, Beccari, and Hose). 



