Crustacea Decapoda and Stomatopoda. 



■275 



1902. 



1904. 

 1905. 



1915- 



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. gracilipcs, de Man. 



1892. Caridina wyckii, var. gracilipes, de Man, in Weber's Zool. Ergebn. Raise Nied. Ost-Ind., 



II, p. 393, pi. xxiv, figs. 29, a-e. 

 Caridina wyckii gracilipes, Schenkel, Verh. natiirf. Ges. Basel, XIII, p. 498, pi. viii, fig. 5 



(in part). 

 Caridina wyckii var. gracilipes, Roux, Rev. Suisse Zool., XII, p. 554. 

 Caridina nilotica var. gracilipes, Bouvier, Ann. sci. France Belgique, XXXIX, p. 73. 

 Caridina nilotica var. bengalensis, de Man, Rec. Ind. Mus., II, p. 265, pi. xx, figs. 6, 6a, 



6b. 

 Caridina nilotica var. gracilipes, de Man, ibid., p. 207, pi. xx, figs. 7, ja, yb. 

 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. 







Ventral teeth. 



(Proximal series only.) 

 I specimen has 10 tee 

 I ,, ,, II , 

 3 specimens have 12 , 



th. 



I 



3 



8 



specimen has 6 teeth 

 specimens have 7 ,, 

 8 

 9 ,, 



4 ., ., 13 , 

 6 ,, ,, 14 . 





9 

 6 



,, ,. 10 ,, 



,, ,, II ,, 



3 .. .. 15 , 





2 



,, !, 12 ., 



7 „ ,. 16 , 



4 ,, .. 17 - 

 I specimen has 18 , 



I „ .. 19 > 





I 

 I 



specimen has 13 ,, 

 „ 14 ,, 



2 specimens have 20 , 









