Crustacea Decapoda and Stoniatopoda. 
275 
Caridina propinqua has hitherto been recorded only from the vicinity of Calcutta 
and from the Chilka Lake and the neighbourhood of Puri in Orissa. 
Caridina nilotica, Roux, 
subsp. gracilipes, de Man. 
1892. Caridina wyckii, var. gracilipes, de Man, in Weber's Zool. Ergebn. Reise Nied. Osi-Ind., 
II> P- 393, pl- xxiv, figs. 29, a-e. 
1902. Caridina wyckii gracilipes, Schenkel, Verh. naturf. Ges. Basel, XIII, p. 498, pl. viii, fig, 5 
(in part). 
1904. Caridina wyckii var. gracilipes, Roux, Rev. Suisse Zool., XII, p. 554, 
1905. Caridina nilotica var. gracilipes, Bouvier, Ann. sci. France Belgique, XXXIX, p. 73. 
1908. Caridina nilotica var. bengalensis , de Man, Rec. Ind. Mus., II, p. 265, pl. xx, figs. 6, 6a, 
6b. 
1908. Caridina nilotica var. gracilipes, de Man, ibid., p. 207, pl. xx, figs. 7, ya, yb. 
1915. Caridina nilotica var. bengalensis, Kemp, Mem. Ind. Mus., V, p. 307. 
I have already drawn attention to the fact that Indian specimens of C. nilotica 
subsp. bengalensis show a greater range of variation than is indicated by de Man and 
that in consequence it becomes almost impossible to separate the Indian race from the 
subsp. gracilipes, described from Celebes. 
A short series of specimens obtained by Dr. Annandale at Shanghai still further 
emphasizes the close relationship that exists between the two races, and I am therefore 
forced to the conclusion that bengalensis must be regarded merely as a synonym of 
gracilipes. In a few points differences may certainly be detected between the forms 
inhabiting India, Celebes and N. China, but these in my opinion are too trivial to 
justify nomenclatorial recognition ; in most cases they can only be discerned by taking 
the average characters of a large number of specimens and they are clearly of far less 
weight than those employed in the case of other subspecies. 
In the Shanghai specimens the rostrum reaches a little beyond the end of the 
antennal scale and is armed dorsally at its proximal end with from 10 to 20 teeth 
(usually 12 to 17).' Of these the first i or 2 are placed on the carapace behind the 
orbital notch. At the apex there are from i to 3 dorsal teeth (nearly always i) ; in no 
case are there any isolated teeth between these and the foremost of those comprising 
the proximal series. The teeth on the lower border are from 6 to 14 in number, 
usually 7 to 12.^ 
1 In thirty-three specimens the numbers of teeth are as follows :- 
Dorsal teeth. 
(Proximal series only.) 
1 specimen has 10 teeth. 
3 specimens have 12 
13 
14 
15 
16 
17 
I specimen has 18 
1 „ » 19 
2 specimens have 20 
Ventral teeth. 
1 specimen has 6 teeth. 
3 specimens have 7 ,, 
2 ,, ,, 8 
8 „ 9 „ 
9 M 10 ,, 
6 ,, II ,, 
2 ,, ,, 13 ,, 
I specimen has 13 ,, 
I >, ,■ 14 .. 
