


40. ZOOLOGICAL RESULTS OF THE PERCY SLADEN 
TRUST EXPEDITION TO YUNNAN UNDER THE 
LEADERSHIP OF PROFESSOR J. W. GREGORY, 
F.R.S. (1922). 
DECAPOD CRUSTACEA. 
By Stantey Kemp, Sc.D., Zoolegical Survey of India. 
(Plate 18.) 
Four species of Decapod Crustacea are represented in the 
collection made by Professor Gregory’s expedition. The only 
Macruran is a species of Caridina from Tali-fu, which, apart 
from the fact that it had not hitherto been described, is 
interesting in showing peculiar sexual modifications in the 
third and fourth legs of the male. Similar modifications are 
known to occur in two of the more primitive genera of the 
family Atyidae, but had not previously been discovered in 
Caridina. Of the three river-crabs one species, belonging to 
the genus Potamon and subgenus Potamiscus, is regarded as 
new. Qne species, Parathelphusa (Phricotelphusa) elegans, was 
found on the Burmese side of the frontier. 
Tribe CARIDEA. 
Family ATYIDAE. 
Caridina gregoriana, sp. nov, 



! Of fifty specimens, one has 8 dorsal teeth, six have 9, eight have 
10, eleven have 11, fourteen have 12, three have 13, five have 14, one has 
15 and one has 17. 

