226 J, G. DE Man : The Fauna of Brackish Ponds. [Voi,. II, 



The following legs are slender, those of the fifth pair extend 

 with their dactyli beyond the antennal scales. In a young specimen 

 from Calcutta, which is 24 mm. in length, the legs of the fifth pair 

 show the following measurements ; merus 2 "66 mm. long and 17 

 times as long as broad, carpus i"4 mm. long, propodus 3 mm. long 

 and O'li mm. broad in the middle, dactylus i mm. long and just 

 as broad at the articulation as the preceding joint in the middle. 

 The propodite, much slenderer than the merus and thickening to- 

 wards the distal extremity, is just three times as long as the 

 dactylus, which is very slightly curved towards the extremity. 



Pal. atnazonicus , Heller, with which Pal. ensiculus, Smith, and 

 Pal. jelskii, Miers, are regarded as identical by Dr. Ortmann, is no 

 doubt a different species. Three specimens of de Haan's Pal. 

 dieperinkii from Surinam (lycyden Museum), a species identical 

 with Pal. amazonicus (de Man, '' Notes, lycyden Museum," i, 1879, 

 p. 167) are lying before me. In this species the telson tapers to a 

 pointed extremity, whereas the lateral spinules do not reach the 

 tip ; the two pairs of spinules on the upper surface are situated 

 more forward, the anterior pair being farther distant from the 

 tip of the telson than from its base. The rostrum is higher at its 

 base, though in this species also the two first teeth are on the cara- 

 pace. Unfortunately the three specimens are adult, the carapace 

 of the youngest, without the rostrum, being 21 mm. long, so that 

 I am unable to compare the legs, the measurements of which show 

 other proportions than in very young specimens, 



i\s regards Pal. carcinus, I wish to observe that in the young- 

 est specimen from the Kutei river the carpus (675 mm.) of the 

 second legs is but little longer than the merus (5 "5 mm.), slightly 

 shorter than the chela (7 '25 mm.) and only once and a half as long as 

 the palm (4'25 mm.). 



Geographical distribution : Coast of Bengal (H, M, Bdw,), 



8, Palcemon, sp. 



Two specimens from Dhappa, near Calcutta, slightly brackish 

 water. 



The two specimens are of equal size, 17 — 18 mm. long from tip 

 of rostrum to end of telson ; they are apparently very young and 

 the legs, especially those of the first and second pairs, are wanting, 

 so that I am unable to identify them with an^^ known form. 



The lanceolate rostrum is straight and barely reaches beyond 

 the antennal scales. In both specimens the rostrum is '^"^ dentate ; 

 the two first teeth are placed on the carapace and are once and a 

 half respectively almost twice as far distant from each other as the 

 second from the third ; the following teeth are equidistant, but in 

 one specimen the tenth tooth is farther remote from the eleventh, 

 the distance between these two teeth being equal to the distance 

 between the eleventh tooth and the tip, in the other the ninth and 

 the tenth are farther distant than the preceding. 



Body smooth. The telson tapers to a median point, far ex- 

 ceeded by the long, inner pair of subterminal spinules ; the anterior 



