TILUMNIDAE. 41 



Xanthodius cristatus (Boiradaile). 



Leptodius (Xanthodius) cristatus Borradaile, Fauua Maldive Arch., 1902, 1, part 3, 

 IT)-', text fig. 51. 



Makemo, Paumotus; reef; Oct. 21, 1899; 1 <J, 2 ?. 



Ponape, Carolines; reef; Feb. 11, 1900; 2 9 ovigerous. 



1 6% 3 ? are of the size described by Borradaile, and agree with his 

 description but not entirely with his figure. The carapace is widest at 

 the penultimate tooth, the trough on the propodal segments of the legs 

 extends the whole length of the segment, but the propodi are shorter 

 and dactyli longer than shown in the figure. A larger ?, 5.3 x 8 mm., 

 soft shell, from Makemo, has more marked characteristics. The surface is 

 more uneven, the areolae being more raised, the depressions on the upper 

 surface of the palms are very deep, as on the legs. 



Cycloxanthops cavatus, sp. nov. 

 Plate 5, Fig. 8; PI. 6, Figs. 3, 3 a. 



Carapace about f as long as broad ; posterior half level, anterior half 

 strongly deflexed; surface very uneven. On the anterior half are six 

 longitudinal elevations ; two small elevations on inner branchial region ; 

 a transverse ridge runs inward from the third and fourth teeth of the sharp 

 lateral border. Between the first and second teeth (orbital angle not in- 

 cluded), and just above the margin, there is a deep circular pit ; less strik- 

 ing depressions separate the other teeth. Surface closely granulate. 



Front deflexed, margin slightly convex, median notch small, orbital 

 angle separated by a rectangular notch. 



Basal joint of antenna touching the front with its inner angle ; movable 

 portion crowded between the front and the orbital angle. Anterior margin 

 of merus of maxilliped concave ; outer angle a produced rounded lobe. 



Only the right cheliped is present ; its surface is closely granulate and 

 very uneven, like that of the carapace. Upper surface of wrist and hand 

 covered with depressions separated by irregular ridges, which form three 

 nodulous crests on the hand ; outer surface with two additional granulate 

 ridges. Fingers short, light-colored, grooved, not gaping, prehensile teeth 

 low, upper edge of dactylus thin, sharp. 



Merus of legs with a thin upper crest ; carpus and propodus bicristate. 



