434 MR. J. R. HENDERSON— A CONTRIBUTION 



Group Caeoea. 

 Genus Caeidina, Milne-Edwards. 



248. Caeidina "VVyckii (Hickson). 



C. Wyckii (Hickson), De Man, Max Weber's Crust, p. 386, Taf. xxiv. fig. 29 (1891). 



Madras, common in wells and in ponds with clear fresh water (J. E. DT.). 



I can find no difference, except in size, between Madras specimens and Hickson's types 

 in the British Museum, the Indian examples being considerably larger, and reaching a 

 length of about 35 mm., including the rostrum ; they also completely agree with De 

 Man's excellent description and figures. I first observed the species in a swimming- 

 bath at North wick, Madras, the residence of my friend the Eev. Dr. Miller. As De Man 

 has pointed out, it is very closely related to C. nilotica, Roux (= C. longirostris, Milne- 

 Edw.), from N. and E. Africa, and perhaps the two species are not distinct. 



A Caridina from Roorkee, in the Day collection, is represented by a single damaged 

 specimen which cannot be satisfactorily identified. 



Distribution. Celebes, in fresh water at an altitude of 2000 ft. (Hickson) ; Celebes, 

 Saleyer, and Elores, in fresh and brackish water (De Man). 



Genus Alphetjs, Eabricius. 



249. Alphetjs malabaeictjs, Eabr. (PL XL. figs. 1-3.) 



A. malabaricus, Fabr. Suppl. Ent. Syst. p. 405 (1798) ; non A. malabaricus, De Haan, nee Hilgendorf, 

 nee Ortmann. 



Common in the backwater at Pulicat, and apparently burrowing in a muddy bottom 

 (J. E. B.). 



The ocular hoods are prominent, but simply rounded, and placed closer together than 

 usual. The rostrum is acute, reaching the level of the basal antennular scales, and not 

 extending back on the carapace behind the posterior limit of the eyes, though clearly 

 distinct from the latter. The antennal and antennular peduncles are subequal in length. 

 The antennular scales do not reach the end of the proximal peduncular joint by about 

 one fourth the length of the latter, and the second peduncular joint is fully twice the 

 length of the distal one. The antennal scales are about equal in length to both the 

 antennal and antennular peduncles, and the outer distal spine is minute. 



The larger chelipede, which may be either the right or the left, is slender proximally, 

 but has a massive hand. The merus has a slight tooth on its upper distal surface, and a 

 well-marked spine on the inner distal margin. The hand is moderately compressed, 

 with a distinct sulcus crossing the upper margin behind the insertion of the mobile 

 finger, and a second sulcus immediately underneath on the lower margin ; both the 

 upper and lower margins behind the sulci are well rounded. On both the inner and 

 the outer surfaces of the hand a wide shallow furrow with ill-defined margins passes 

 back from the upper sulcus ; the outer of these furrows passes somewhat oblicmely 

 towards the proximal inferior angle of the joint, while the inner, which is scarcely so 



