44 THE BRACHYTTRA. 



Actaea cavipes (Dana). 

 PI. 1, Fig. 2. 



Actaea cavipes Alcock, 1898, 67, 147. 



Rangiroald.; beach; Sept. 21, 1899; 1 <?. 



Fakarava, Paumotus ; shoal in lagoon ; Oct. 11, 1899 ; 3 <?. 



Fakarava; outer reef; Oct. 12, 1899; 2 <?, 1 2. 



Borabora Ids., Society Group; fringing reef; Nov. 17, 1899; 5 3, 2 juv. 



Funafuti, Ellice Ids.; reef; Dec. 24, 1899; 1 <?, 1 <?. 



Tari-Tari Id.; shore, reef; Jan. 6, 1900; 2 <?. 3 ?. 



Daira perlata (Herbst). 



Daira perlata Alcock, 1900, 67, 155. 



Papeete, Tahiti ; reef; Sept. 28, 1899 ; 3 juv. 



Xanthias lamarckii (Milne Edwards). 



Xanthodes lamarckii Alcock, 1898, 67, 157. 



Papeete, Tahiti; reef; Sept. 28, 1899; 1 <?, 1 ?. 



Fakarava Id., Paumotus; outer reef; Oct. 12, 1899; 1 <?, 4 <? (1 ovig.), 

 1 juv. 



Makemo, Paumotus; reef; Oct. 21, 1899; 2 <?, 2 <?. 



Borabora Id., Society Group; fringing reef; Nov. 17, 1899 ; 2 S, 2 ?. 



Xanthias ponapensis, sp. nov. 

 PL 7, Figs. 5, 5 a. 



The carapace is almost smooth, punctate, microscopically granulous, 

 granules more discernible along the antero-lateral margin. Orbital region 

 marked off by a groove, gastric region and its subdivisions well delimited, 

 otherwise the carapace is scarcely divided. Frontal lobes faintly sinuous, 

 their outer angles rectangular, and separated from the orbit by a rectangular 

 notch. Antero-lateral margin thick; teeth four (besides the orbital angle), 

 the first minute and distant from the orbit, the third most prominent. 



Chelipeds unequal, surface similar to that of the carapace ; merus roughly 

 granulous above, wrist and hand smooth to the eye, the larger punctae of 

 the hand arranged somewhat in longitudinal lines. Fingers stout, gaping at 



