282 ZOOLOGY OF THE FAR EAST. 
with dense jungle. They were most abundant among the roots of grasses, etc., at the 
edge. 
The types of the subspecies, which are from Penang, bear the number 9667/10 in 
the register of the Zoological Survey of India. 
Caridina gracilirostris, deMan. 
1892. Caridina gracilirostris, de Man, in Weber's Zool. Ergehn. Reise Nied. Osl-Ind. II, p. 399, 
pi. XXV, fig. 31. 
T904. Caridina gracilirostris, Roux, Rev. Suisse Zool., XII, p. 555. 
1905. Caridina gracilirostris, Bouvier, Ann. sci. France Belgiqiie, XXXIX, p. 72. 
1908. Caridina sp., de Man, Rec. Ind. Mns., II, p. 227. 
This species, hitherto recorded only from Celebes, Flores and Sumatra, is 
represented in Dr. Annandale's collection by a number of specimens from Peninsular 
Siam. There are also in the Indian Museum numerous examples from four widely 
separated parts of India. The following is a list oJ the localities from which specimens 
have been examined : — 
Dhappa, near Calcutta. N. Annandale. Brackish water. Three specimens 
(much damaged ; recorded by de Man in 1908 as Caridina sp.). 
Garia, near Calcutta : Dec, 1910, and Jan., 1911. S. Kemp. Brackish water. 
Seventeen specimens. 
Sanguem R., Sanvordem, Portuguese India : Sept., 1916. S. Kemp. In water 
fresh at the time of capture, but subject to tidal influence. Six specimens. 
Udaiyarpettai Kulam, Tinnevelly, S. India: Sept., 1911. J. R. Hill. Fresh 
water. Twenty-three specimens. 
Tambrapani R., Tinnevelly, S. India: Sept., 1911. J. R. Hill. Fresh water. 
About sixty specimens. 
Vellaney, Travancore : March and Sept., 1911. S. N. Pillay. Fresh water. 
About fifty specimens. 
Patani R., below town of Patani,*Siamese Malay States. N. Annandale. In 
water fresh at the time of capture, but subject to tidal influence. 
In addition there are three specimens from Celebes, determined by de Man and 
received in exchange from Prof. Max Weber. 
Ovigerous females were found in the months of September, December, January, 
February and March and occur in samples from all the localities listed above with the 
exception of Dhappa. 
I have made a close comparison of the available material with a view to deter- 
mining the possible existence of distinct races of the species. Specimens from 
different localities, however, agree very closely in structure and the few small differ- 
ences that were observed in the case of one or two samples are of far too trivial a 
character to justify subspecific recognition. 
The rostrum varies very considerably in length and is apparently longest in 
adolescent individuals between 25 and 30 mm. in length. In these it not infre- 
quently exceeds twice the length of the carapace. In adults, especially in large 
