Crustacea Decapoda and Stomatopoda. 270 



only in two races of the species/ viz. the typical form, which is found in Egypt, 

 and the subspecies paucipara from Natal. From both these forms the subspecies 

 macrophora is distinguished by the greater proportionate length of the dactylus of the 

 third legs, while from pa-ucipara it also differs in the smaller number of spinules on 

 the dactylus of the last leg. 



C. n. macrophora may also be distinguished from all the other known races by 

 the reduced number of teeth on the rostrum, a feature which is especially marked in 

 the case of those on the lower border. 



I have little doubt that the two mutilated specimens recorded by lyanchester * 

 from the River Petwi, Tale Sap, as Caridina wycki axe to be referred to this sub- 

 species. 



The specimens were all obtained in January, 1916, at the northern end of the 

 Tale Sap in and near the mouth of the Patalung River. The water where they were 

 found was quite fresh, though subject to slight alterations of level according to the 

 state of the tide, and probably remains fresh throughout the year. The types bear 

 the number 9664/10 in the register of the Zoological Survey of India. 



Caridina brachydactyla, de Man. 



1892. Caridina wyckii, de Man {nee Hickson), in Weber's ZooJ. Ergebn. Reise Nied. Ost-Ind., 



II, p. 386, pi. xxiv, figs. 29 /, g, i, ii, k, cc, dd. 

 1908. Caridina nilotica var. brachydactyla, de Man, Rec. Ind. Mus., II, p. 269. 

 1913. Caridina brachydactyla. Bouvier, Trans. Linn. Soc, Zool. (2), XV, pp. 463,466. 



subsp. pcninsularis, nov. 



A number of specimens collected by Dr. Annandale near Patani, in the Siamese 

 Malay States and on Penang I. appear to represent a local race of de Man' s C. nilotica var. 

 brachydactyla. This form, hitherto known only from Celebes, Flores and Saleyer, dif- 

 fers notably from all other varieties of C. nilotica in the very short dactyh of the last 

 three pairs of legs and Bouvier, whom I follow, has recently given it full specific rank. 



Minor points of distinction are to be found between individuals from Patani and 

 those from Penang, while the specimens from both these localities in my opinion differ 

 sufficiently from those described by de Man to justify their separation as a distinct 

 subspecies. 



The rostrum (text-fig. loa) always exceeds the length of the antennular peduncle 

 and in some cases extends a trifle beyond the end of the antennal scale. It is a little 

 upturned distally, more rarely straight, and is armed above with a series of 21 to 37 

 (usually 25 to 32) teeth of which 3 or 4 (usually 3) are situated on the carapace behind 

 the orbital notch. In most of the specimens examined by de Man a considerable length 

 of the rostrum towards its distal end is unarmed, except for the presence of from t to 3 

 subterminal teeth, in this respect resembling C. nilotica. In the specimens before me 

 the condition is quite different. The teeth, in the great majority of cases, stretch un- 



1 The size of the eggs in C. nilotica subsp. wycki, Hickson, a race found in Lake Tondano in Celebes, is at present 

 unknown. No ovigerous females occur among cotypes of the subspecies preserved in the Indian Museum. 

 ^ Manchester, Proc. Zool. Soc. London, iqoi, p. 560. 



