1901.] CRUSTACEA OF THE "' SKEAT KXPEBlTlOlsr." 0~)'J 



rectilinear; ou segments 5-(j there is ou!}' one white band, wiiich 

 in the latter is convex to the hiud margin in the middle line. The 

 legs are longitndinall}^ stri])ed with white. 



This individual presents all the characteristics of S. ornatus as 

 defined by Dr. Ortmann {I. c); the points of difference may be 

 grouped nnder three headings : — 



a. The small number of spines on the carapace. 



h. The coloration, i. e., the three distinct white bauds, 

 running longitudinally on the carapace and parallel to each other. 

 Here, too, I may note that the coloration of the abdomen and 

 legs is that of S. faseiatus de Haau, but the number of teeth on 

 the anteunal segment is that of S. ornatus, viz. four. 



c. A point I have not mentioned above, viz., that the inner 

 antenna! exceed the outer considerablt/ in length, namely, by tlie 

 last joint and one-third of the penultimate joint. In regard to this, 

 Dr. Ortmann says : " Stiele der inneren Antenuen etw as liinger oder 

 so lang wie die der aiisseren." 



XXXIX. Grenus Atva. 

 6-1. A'ilA ARMATA A. M.-Edw. 



Atya ai-mata, A. M.-Edw. Ann. 8oc. Entom. France, (4) iv. 

 p. 149 (1864); Lanchester, Anu. Mag. Nat. Hist. (7) vi. p. 262 

 (1900). 



Atifa muluccensis, de Mau, AN^eber's Zool. Ergebu. p. '657, pi. xxi. 

 fig. 20 (1892). 



Loc. iSelama Eiver, Perak. An adult male. 



Belimbing. Three males and three females, all young. 



The young forms agree entirely with the description given by 

 Dr. de Man (t. c. p. 358) ; but the adult presents points of 

 difference, in regard to the spines on the last three legs, from the 

 individual examined by Dr. de Man. In the 3rd pair, the merus 

 of the right (larger) leg only bears a blunt tubercle near the 

 carpal joint, and the carpus bears on its under surface a much 

 smaller tubercle, which, in flexion, nearly meets that on the merus. 

 In the 4th pair, the merus of the right leg bears only one spine 

 instead of two, and the carpus one. The left leg has one on the 

 merus, none on the carpus. The 5th pair arc as described by 

 Dr. de Man. 



Tlie teeth on the under surface of the rostrum number as 

 follows :— 



xidult S 9. 



Young S 10, 13, 11 ; $ 9, 13, 10. 



The length of the adult is 81 mm. ; the young specimens range 

 between 57 mm. to 47 mm. 



XL. Grenus Caridina. 

 65. Caridina multidentata Stimpson. 



. Caridina malfideiifata, Stm. Proc. Ac. Xat. 8ci. PluJad. p. 29 



'A7* 



