62 THE BRACHYURA. 
Thalamonyx parvidens, sp. nov. 
Pl. 5, Fig. 9. 
Carapace not 3 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 the middle in the ¢; ina sharp spine in the @, and occasionally 
in the 2; spine near wrist usually blunt in the ¢, sharp in the ¢. 
Merus of last pair of legs 24 x as long as broad. 
Sixth segment of ¢ abdomen 2? as long as broad. 
Dimensions : — Length of type 3, 15.2 mm.; width, 18.7 mm. 
Distribution : — 
Truk, Carolines; shore, in seine; Feb. 16, 1900; 12 ¢, 8 ¢ (1 ovig.). | 
1 ¢ is type (Cat. No. 32,855, U.S. N. M.). 
Mela, Carolines; shore, in seine; Feb. 16, 1900; 9 ¢, 8 ¢ (3 ovig.). 
One of the latter is only 10.3 mm. in width. 
This species differs from 7’. danae (A. Milne Edwards)! and 7. gracilipes 
A. Milne Edwards? in the wider carapace, unequal side-teeth, and smoother 
chelipeds, and from 7. gracilipes in the smaller orbit. 
Thalamita crenata Riippell. 
Thalamita crenata, Alcock, 1899, 68, 76. 
Borabora, Society Ids.; shore and fringing reef; Nov. 17, 1899; 2 ¢, 
5 ¢ (2 ovig.). 
1 Nouv. Arch. Mus. Hist. Nat. Paris, 1869, 5, 153, pl. 7, figs. 6, 7. 
2 Nouv. Arch. Mus. Hist. Nat. Paris, 1873, 9, 169, pl. 4, fig. 3. 
7 
