1909.] CRUSTACEA FROM CHRISTMAS ISLAND, 711 



is hoped that it may be possible to obtain the earlier stages and 

 to give a complete account of the life-history. 



Cardisoma hirtipes Dana. 



Cardiosoma hirtijyes Alcock, Jour. Asiatic Soc. Bengal, Ixix. 

 pt. 2, p. 447 (1900). 



CJardisoma carnifex (Herbst) Andrews, Monogr. Christmas 

 Island, p. 164 (1900). 



Miss Rathbun has recently employed for this species the 

 name C. rotundimi Quoy & Gaimard (Bull. U. S. Fish Coram, for 

 1903, pt. iii. p. 838, 1906), but, so far as I know, she has not 

 explained in detail her reasons for doing so. The figure to which 

 she refers (Freycinet's Voyage autour du Monde, Atlas Zool. 

 pi. 77. fig. 1, 1825) is very poor, and there seems no obvious 

 reason for taking ' it to represent this species rather than 



C. carnifex. i, r.-j. + 



The account which Dr. Andrews has given {I.e.) of the habitat 

 of this species— in deep burrows by the side of freshwater 

 streams— agrees with what Ortmann has recorded (Zool. Jahrb., 

 Abth. Syst. X. p. 339, 1897) of the closely allied G. carnifex in 

 East Africa. Dr. Andrews tells me that he never saw this species 

 at or near the sea (in marked contrast to Gecarcoidea), which also 

 coincides with Ortmann's experience. Since nothing appears to 

 be recorded of the breeding habits of the species of this genus, it 

 may be worth while to mention that in the West African 

 G. armatum (the only species of which the Museum possesses an 

 ovieerous female) I find the young within the minute eggs to be 

 in the zoea stage. There can be little doubt therefore that m this 

 genus also the young stages are passed in the sea. 



Family M A 1 1 d ^. 



Hyastenus andrewsi, sp. n. (Plate LXXII. figs. 6, 7.) 

 Carapace and limbs closely covered with long, thick, soft hairs 

 which, on the walking legs and especially on the merus and carpus 

 of the first two pairs, fringe the anterior and posterior margins 

 and make the limb appear broad and flat. The carapace is tri- 

 angular, with a convex posterior margin and, when denuded of 

 hair, is smooth and polished, with a single low tubercle on each 

 side of the gastric region. The gastric, cardiac, and intestinal 

 regions are strongly convex, defined by well-marked grooves. The 

 rostral spines are less than a quarter of the total length, coalesced 

 for some distance in front of the orbits, deflexed at the base and 

 curving upwards at the tip. The supra-orbital margin is not very 

 prominent and its anterior corner is rounded ofi". The basal 

 segment of the antenna is little expanded so that the floor of the 

 orbit is very incomplete, and is without tubercle or spine at its 

 anterior end ; the free segments of the antenna^ are visible at 

 the side of the rostrum and are beset with long hairs. The first 



