Crustacea Decapoda and Stomatopoda. 
277 
would appear that there is a discontinuity in the distribution of this form. It occurs 
in India and Ceylon on the one hand and in Celebes, N. China and possibly Japan on 
the other hand, but is apparently absent from Java, Sumatra and the Malay Penin- 
sula. Max Weber's extensive collections of Atyidae from Java and Sumatra seem to 
indicate that no form of the wide-spread C. nilotica occurs in those islands, while, judging 
from Dr. Annandale's collection, the species is represented in the Malay Peninsula 
only by the distinct variety described below. 
Caridina nilotica (Roux), 
subsp. macrophora, nov. 
A subspecies of Caridina nilotica, readily distinguished by the very large size of 
its eggs from all the Asiatic races hitherto known, was found by Dr. Annandale in the 
Fig. 9. — Caridina nilotica, subsp. macrophora, nov. 
a. Carapace, rostrum, etc., in lateral view. d. Third peraeopod. 
b. First peraeopod. e. Dactylus of same further enlarged. 
c. Second peraeopod. /. Fifth peraeopod. 
Tale sap in Peninsular Siam. It occurred only in the inner part of the lake in water 
that in all probability is permanently fresh. 
The rostrum (text-fig. 9a) usually extends a little beyond the apex of the antennal 
scale. In lateral view it is directed somewhat downwards in its proximal half, while 
distally it is a little ascendant. The proximal part of the upper margin bears a series 
