54 THE BRACHYURA. 



Ozius hawaiiensis Rathbun. 



Ozius hawaiiensia Rathbun, Proc. IT. S. Nat. Mus., 1902, 26, 76, text figs. 3 & 4; Bull. 

 U. S. Fish Comra. for 1903 (1906), part 3, 862. 



Nukuhiva, Marquesas Ids.; shore, seine; Sept. 15-17,. 1899; 1 <?. 



Rangiroa Id.; beach; Sept. 21, 1899; 1 <?. 



Fakarava Id., Paumotus; outer reef; Oct. 12, 1899; 4 9. 



Makemo, Paumotus; reef; Oct. 21, 1899; 5 <?, 19 ?. 



Kusaie, Carolines; reef; Feb. 8, 1900; 5 <?, 4 ?. 



Ozius tricarinatus, sp. nov. 

 PI. 2, Fig. 3. 



Carapace If times as wide as long, very convex fore and aft, moderately 

 convex from side to side ; interregional depressions deep, surface irregularly 

 granulate and coarsely punctate, and near the antero-lateral margins eroded. 

 Lateral regions crossed by three blunt carinae ; the posterior of these is very 

 low and runs from the last side tooth somewhat obliquely inward toward the 

 widest part of the mesogastric region ; the next ridge is more oblique and 

 begins at the base of the penultimate tooth ; the anterior ridge begins at the 

 next tooth and is directed toward the middle of the orbit ; it is broken in 

 two at the middle, the two parts not in the same line. 



The edge of the front has a submarginal groove and is cut into four 

 rather prominent subequal lobes, the median sinus narrower than the 

 lateral ; outer lobe separated from orbital angle by a furrow. 



Antero-lateral margin blunt, cut into five teeth, the first of which is sep- 

 arated from the orbital margin by a broad furrow ; the first two teeth or 

 lobes are long, shallow, and subequal ; the third is as long but more distinctly 

 angled ; the fourth is shorter and most dentiform and stands at the widest 

 part of the carapace ; fifth tooth much less prominent. 



The type and only adult specimen is a 9 in which the right cheliped or 

 the one which should be the larger, as it has the stout tooth at the 

 base of the dactyl, is abnormally reduced, being much shorter and also 

 narrower than the left one. This last is \\ times as long as carapace ; 

 surface of wrist and hand reticulated, punctate, and covered with flattened 

 granules. 



