98 Records of the Indian Museum. [Vol. XIV, 



they are about 1-0 mm. l)y 0-6 mm. Ovigerous females carry only 

 from 15 to 25 eggs. 



Large specimens reach a total length of about 17 mm. 



Caridina annandalei is allied to C. excavata, Kemp,^ and C. hodgarti, 

 Kemp," from Assam, the three species differing so far as is known from 

 all other members of the genus in the absence of the epipod at the base 

 of the fourth legs. In other respects also they show signs of close affinity. 

 Classified according to the scheme outlined by Bouvier in 1913 ^ all three 

 would take a position near Caridina nilotica, from which, however, 

 they differ in a number of consi)icuous features. In addition to the 

 absence of the epipod on the fourth legs the species resemble each other 

 in their slender build, in the comparatively great proportionate length 

 of the antennular peduncle, in the slightly marked or non-existent 

 excavation at the distal end of the carpus of the first pair of legs and in 

 the possession of large eggs. The species may be distinguished thus : — 



I. Rostrum long, extending at least beyond end of anten- 



nular jjeduncle, the distal part of its upper margin 

 without teeth ; 2nd segment of antennular peduncle 

 not more than twice as long as its basal breadth ; 

 carjius of 1st peraeopod slightly excavate distally, 

 that of 2nd peraeopod less than G times as long as 

 broad ; dactylus of 5th leg about one-third the 

 length of propodus. 



A. Rostrum I'eaching beyond antennal scale, with a 



small svibterminal tooth on upper border ; orbital 

 notch not unusually deeply excavated ; antennal 

 scale 4h times as long as broad ; carpus of 1st 

 peraeojjods about 1| times, that of 2nd about 

 3 times as long as broad ; dactylus of 3rd peraeo- 

 pod with or 7 teeth, that of 5th with about 25 

 teeth ; eggs 0-8 mm. in length ... ... C. liodijnrti. 



B. Rostrum not reaching beyond antennal scale, with- 



out a subterminal dorsal tooth ; orbital notch 

 very deeply excavated ; antennal scale about 

 3 times as long as broad ; carpus of 1st peraeopod 

 about 3 times, that of 2nd about 5^ times as 

 long as broad ; dactylus of 3rd peraeopod with 

 8-10 teeth, that of 5th with 40-50 teeth ; eggs 

 about 1 mm. in length ... ... ... C. excamta 



II. Rostrum short, not reaching end of antennular pe- 



duncle, with teeth throughout the length of its 

 upi^er border ; 2nd segment of antennular peduncle 

 2 1 times as long as its basal breadth ; carpus of 

 1st peraeopod not excavate distally, 3 to 3|^ times as 

 long as broad, that of 2nd more than 7 times as 

 long as broad ; dactylus of 5th leg less than one 

 third the length of propodus. [Antennal scale 3 

 to 31 times as long as broad ; dactylus of 3rd 

 peraeopod with 8-12 teeth, that of 5th peraeopod 

 with 44-66 teeth ; eggs 0-9-1-0 mm. in length] ... 0. unnaiidnlei. 



Caridina annandalei is very abundant among green weeds in ail 

 parts of the Inle Lake * and is also common in flooded rice-fields and 

 waterways in the Yawngwhe plain. In these localities it occurs at 

 an altitude of 3000 ft. It was also found, though less plentifully in the 



1 Kemp, Rec. hid. Mus., VIII, p. 306, pi. xx, figs. 32-35. pi. xxi, figs. 36, 37 (1913). 



2 Kemp, ibid., p. 309, pi. xx, figs. 29-31, pi. xxi, figs. 38, 39 (1913). 

 =i Bouvier, Tram. Linn. Soc. (2), Zool, XV, p. 462 (1913). 



* Ovigerous females were found only in the lake. 



