Crustacea Decapoda and Stoniatopoda. 



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. macropiiora, nov. 

 Carapace, rostrum, etc., in lateral view. d. Third peraeopod. 



First peraeopod. e. Dactylus of same further enlarged. 



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-iig. ga) 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 



