1900.] ON FRESHWATER CRUSTACEANS FROM NORTH BORNEO. 93 



1. On a small Collection of Decapod Crustaceans from 

 Freshwaters in North Borneo. By L. A. Borradaile, 

 M.A., F.Z.S., Lecturer in Natural Sciences of Selwyn 

 College, Cambridge. 



[Eeceived January 12, 1900.] 



By the courtesy of Dr. R. Hanitsch, of the Baffles Museum at 

 Singapore, I am given the opportunity of reporting on some fresh- 

 water Crustaceans obtained by him in North Borneo during the 

 month of March 1899. 



The collection contains specimens of the following species : — 



1. Palcemon pilimanus de Man. 



2. Potamon convexum (de Man). 



3. Potamon consohrinum de Man. 



4. Potamon kadamaianum, n. sp. 



All the three known species have been already recorded from 

 Borneo ; and the new one is allied to a form found in that 

 island by the Dutch Central Borneo expedition. 



Suborder MACKURA. 



Tribe Carioea. 

 Family Pauemonid^e. 



Genus Palcemon. 



1. Palcemon (Macrobrachium) pilimanus de Man. 



Palcemon pilimanus, de Man, Notes Leyd. Mus. i. p. 181(1879) ; 

 Veth's ' Midden-Sumatra,' Crust, p. 4, pi. ii. fig. 2 (1887). 



Palcemon (Macrobrachium) pilimanus, Ortmann, Zool. Jahrb. x. 

 Syst. p. 735, pi. xlvii. fig. 9 (1891); de Man, Notes Leyd. Mus. 

 xx. p. 158 (1898). 



The single specimen, which is from the Inuman Biver, between 

 Kalawal and Bungol, British North Borneo, differs from Ortmann's 

 figure in having the submedian spines of the telson considerably 

 shorter ; it is very possible, however, that the ends of these have 

 been worn or broken off. 



Suborder BEACHYTJRA. 



Tribe Cyclometopa. 



Family Potamonid^e. 



Genus Potamon. 



2. Potamon (Parathelphusa) convexum (de Man). 

 Paratelphusa convexa de Haan, de Man, Notes Leyd. Mus. i. 



p. 63 (1879) ; Max Weber's ' Eeise Ned. O.-Ind.' ii. p. 302 (1892). 



