230 J. G. DE Man : The Fauna of Brackish Ponds. [Voi,. 11, 



length of the propodite and is armed with 48 spinules, the terminal 

 claw included. Caridina syriaca, Bouv., is at once distinguished by 

 the upper teeth of the rostrum, none of which are placed on the 

 carapace. 



When the descriptions of Car. fossarum (Heller, in " Sitzungs- 

 ber. K. Akad. Wiss.," 1862, p. 411, and de Man, in Max Weber's 

 " Zool. Brgebn. Reise Niederl. Ost-Indien/' ii, 1892, p. 397) are 

 compared, it becomes obvious that the Bengal species chiefly differs 

 by the lower margin of the rostrum presenting only i or 2 teeth 

 instead of 7 — 9. In the same paper [I.e., p. 377) I have, however, 

 pointed out that in Car. Icevis, Heller, a closely related species from 

 Java, the lower margin presents not onl}^ 3 teeth, as was described 

 by Heller, but sometimes 4 to 9, 11 or 15, though also a specimen 

 was observed from the same locality with 2 teeth and another in 

 which the lower margin carried only one tooth ! This great varia- 

 tion may also be proper to Car. propinqua, and in that case this 

 species should perhaps prove to be identical with Car. fossarum : 

 a further observation of specimens of the Bengal species appears 

 therefore necessary. Several ovigerous females of Car. IcBvis, 

 Heller, from the freshwater lake Situ Bagendit, Java (de Man, 

 I.e., p. 376) are lying before me. This species may easily be distin- 

 guished lay the legs of the first and of the second pair. The carpus 

 of the first legs closely resembles that of Car. propinqua , as it is also 

 two and a half times as long as broad, but the fingers are a little 

 shorter. The carpus (plate xix, fig. 7) of the second legs has a slen- 

 derer shape, being almost eight times as long as thick distally ; the 

 chief difference is, however, presented by the chela which has a much 

 slenderer form, being 4 — 47 times as long as broad (fig. ya) ; in Car. 

 propinqua only about 3 times (fig. 6e). 



As regards the other legs the two species closely agree as is 

 proved by the measurements given below, and also by the following : 

 The meropodites of the third pair are about 9 times as long as 

 broad, there is a spine on the middle of the lower margin of the 

 ischium and three on that of the meropodites ; the second spine is 

 inserted a little nearer to the distal than to the proximal extremity, 

 the first just midway between the proximal extremity and the 

 second spine, the third near the distal extremity ; these spines are 

 o'2 ram. long. A similar spine occurs at the far end of the carpus. 

 The propodites carry 16 — 18 spinules along their lower margin ; the 

 dactyli are in the same proportion to the propodites as in Car. 

 propinqua, but they are armed with eight or nine spines. 



The meropodites of the fifth pair are, in Car. Icevis, just 8 

 times as long as broad and one-fourth shorter than those of the 

 third ; the ischium has no spine, but there is a spine near the middle 

 of the lower margin of the meropodites and another not far from 

 the distal extremity. There is also a spine at the far end of the 

 carpus and three smaller spines between the former and the 

 proximal extremity. 



Car. hova, Nob., from Madagascar and Car. opaensis, Roux, 

 from Celebes are also related species. In the Madagascar species 



