438 Journal of the Asiatic Sociely of Bengal. [N.S., XIX, 
articulated. In advance of the series, on the anterior half of 
the rostrum one or two isolated teeth, which are not articu- 
lated, are usually to be found; the foremost tooth is never 
placed so close to the apex as to give it a bifid appearance. 
The lower portion of the rostral blade is well developed and 
bears from 0 to 3 teeth,' usually Ll, in the anterior half. 
The preorbital length of the antennular peduncle is 
slightly more than 0-8 times the post-orbital length of the 
carapace (from 0'S1 to 0°s5 according to my measurements). 
The orbit is rather deeply excavated, but with its lower angle 
little prominent. The antennal spine is strong and the antero- 
lateral angles rather broadly rounded. 
The antennular somite does not appear to be dorsally 

6. ee 
TEext-FIG. 1.—Caridina gregoriana, sp. nov. 
a, Carapace, rostrum, etc., of an ovigerous female. 
b., c. Rostra of two other specimens. 

| Of fifty specimens, nine have no ventral teeth, twenty-six have 
1 tooth, eleven have 2 teeth, and four have 3 teeth. 
a a 

