86 AN EXPEDITION TO MOUNT KINA BALU. 
The dactyles of the walking-legs are rather shorter and 
stouter than is indicated in de Man’s figure of the allied P. 
maculata. The fingers of the chelae are dark in colour. P. 
conuexa is already recorded from Java, Timor, and New Guinea, 
and doubtfully from Borneo h P. maculata (de Man) 1879 is 
a closely allied form from Sumatra. 
1 $ British North Borneo.” 
3. “POTAMON (Thelphusa)^ consobrinum, de Man. 
Potamon {Potam.on) consohrinuni^ de Man, Notes Leyd. Mus. 
xxi. p. 99, pis. vi., ix., x. fig. 10 (1899). 
This species is already reported from Borneo (Mti Damoes 
and Upper Sibau River) by de Man. Ortmann (Zool. Jalirb. x. 
Syst. p. 301) gives a list of allied forms and their distidbution. 
2 1 $ ; Kadamaian River, Kina Balu, 2,100 feet.” 
4. “ Potamon (Geothelphusa) kadamaianum, n. sp. 
A single female specimen of a form allied to P, obtusipes 
(Stimps.) 1858, and P. dehaani (Gray) 1847, seems to deserve a 
name of its own. Whether it were not better treated as a local 
race of one of the above species, or all three as local forms of 
P. dehaani, is a question to be settled when the subject of -the 
interrelationship of the various forms in the genus coines up for 
discussion. In the meantime its distinctness seems quite as great 
as that of several of the generally accepted species. It differs 
from P. obtusipes in the greater slenderness of its legs, especially 
of the dactyles, which are long and narrow and end in a sharp 
claw.* * A Pota7uon of the subgenus Geothelphusa with the surface 
of the carapace smooth and finely pitted over the greater part of 
its extent, finely granular on the front, more coarsely so on the 
forepart of the branchial region, rugose on the hinder part of the 
same region ; the front much deflexed, ending below the outer 
-angles of the orbits, when viewed in front bounded by an almost 
straight line curving away gradually towards the outer angles ; 
^Miers, Ann. Mag. Nat, (5) v. p. S06 (1880). / 
2 According to Ortraan (Zool. Jalirb. x, Sjst. 300) Thelphusa is the 
correct name for the subgenus in which this species must be placed. 
* The portion defined by asterisks was by Mr. Boi'radaile’s wish sub- 
stituted for the original passage in the P. Z, S. 
