rgoS.] Records of the Indian Museum. 265 



toothed part and that of the terminal unarmed part of the upper 

 margin is respectively expressed by the numbers i"38, 2 and i"4. 

 Besides one subapical toothy the upper edge is armed with 14 — 21 

 teeth, the lower with 11 — 17. On an average the toothed part of 

 the upper edge appears only once and a half as long as the termi- 

 nal unarmed part, but in the typical form from the Nile the un- 

 armed part is usually shorter, measuring sometimes even barely one- 

 third of the toothed part (Table A, No. 4). My contention {I.e., 

 1892, p. 396) that all the upper teeth are placed on the rostrum 

 proper, i)roved to be erroneous, for one or two are placed on the 

 carapace behind the orbital margin. This variety is, however, also 

 distinguished by the thoracic legs. The carpus of the ist legs 

 appears usually broader in proportion to its length than in the 

 typical form of Eg3^pt and than in the other varieties, except 

 the var. wyckii, Hicks., and the var, minahassa, de M. The average 

 number, indeed, indicating the proportion between length and 

 breadth of the carpus is for the eight measured specimens from 

 the river Macta i"64, but for the ten of the typical form from Cairo 

 2 ; the carpus of the var. longirosiris appears therefore on the aver- 

 age once and a half as long as broad. As is proved by the measure- 

 ments, the shape of the carpus of the 2nd legs is very variable : in 

 some specimens, indeed, this joint is not quite four times, but in 

 . other cases almost five times as long as broad. 



The dactyli of the three posterior legs are always a little longer 

 than one- fourth of the propodite, nearly as in the Egyptian form, 

 but they are a little slenderer ; those of the 3rd pair are armed 

 with 7 — 10 spines, the terminal claw^ included, those of the 5th 

 with 35 — 40. The ischium of the 3rd legs carries a spine in the 

 middle, the meropodite of these legs is armed with 3 spines, the 2nd 

 about in the middle, the ist midway between the 2nd and the 

 proximal extremity, the 3rd near the distal end. Carpus with a si^ine 

 near the far end and with two smaller spinules between this spine 

 and the proximal extremit3^ The meropodite of the 5th legs 

 carries a spine just in the middle and one near the distal extremity', 

 while one also observes a spine near the distal end of the carpus. 



The var. longirostris attains a length of 19 mm., its size being 

 smaller than that of the typical form. 



5. Caridina nilotica (Roux), var. bengalensis, nov. 

 Tabi^e F. 

 (Plate XX, figs. 6, 6a, 6b.) 



Caridina wyckii (Hickson), Henderson, "A Contribution to 

 Indian Carcinology," 1893, p. 434 (Trans. Linnean vSoc. Zool., vSer. 

 2, vol. v) ; Nobili, Boll.Mus. Zool. Torino, xviii. No. 452, 1903, p. 6. 



The 191 specimens enumerated above and collected in brack- 

 ish ponds at Port Canning and at Dhappa, near Calcutta, appar- 

 ently belong to a new variety, different from those living in 

 Africa as also from the varieties that have been observed on the 

 islands of the Indian Archipelago. This new variety dift'ers from 



