62 THE BEACHYUEA. 



Thalamonyx parvidens, sp. nov. 

 PI. 5, Fig. 9. 



Carapace not | as long as broad ; surface minutely granulate and covered 

 with fine hairs easily rubbed off. Besides the three gastric ridges, the last 

 of which is continued to the posterior lateral tooth, there is a short ridge 

 on each branchial region. 



Front prominent, convex, a well-marked median V. 



Antero-lateral borders little oblique ; of the five teeth, the last two are 

 smaller than the others, the fourth being the shortest, the fifth spiniform. 



Diameter of orbit about \ the inter-orbital space. 



Chelipeds granulate, especially the arm and wrist. Arm rugose-denticu- 

 late above ; inner border with three graduated teeth and numerous denticles. 

 Wrist costate, three of the costae terminating in low, blunt projections ; a 

 strong spine at inner angle. Chelae very unequal ; two costae on upper sur- 

 face, the inner one with a spine at its middle, outer one ending in a tubercle 

 not far-from tbe middle in the £ ; in a sharp spine in the 9 , and occasionally 

 in the £ ; spine near wrist usually blunt in the £ , sharp in the 9. 



Merus of last pair of legs 2^ x as long as broad. 



Sixth segment of £ abdomen f as long as broad. 



Dimensions: — Length of type £, 15.2 mm.; width, 18.7 mm. 



Distribution : — 



Truk, Carolines; shore, in seine; Feb. 16, 1900; 12 £, 89 (1 ovig.). 

 1 £ is type (Cat. No. 32,855, U. S. N. M.). 



Mela, Carolines; shore, in seine; Feb. 16, 1900; 9 £, 8 9 (3 ovig.). 

 One of the latter is only 10.3 mm. in width. 



This species differs from T. danae (A. Milne Edwards) 1 and T. grarilvpes 

 A. Milne Edwards 2 in the wider carapace, unequal side-teeth, and smoother 

 chelipeds, and from T. gracilipes in the smaller orbit. 



Thalamita crenata Euppell. 



Thalamita crenata, Alcock, 1899, 68, 7G. 



Borabora, Society Ids.; shore and fringing reef; Nov. 17, 1899; 2 £, 

 5 9 (2 ovig.). 



1 Nouv. Arch. Mus. Hist. Nat. Pans, 1869, 5, 153, pi. 7, figs. G, 7. 



2 Nouv. Arch. Mus. Hist. Nat. Paris, 1S73, 9, 109, pi. 4, fig. 3. 



