384 CRUSTACEA. 



XANTHASIA MURIGERA, White. 



Carapax paulo transversus, muro marginali tenui lateraliter posticeque 

 omnino circumscriptus, muro anticd paulo involute, roslro rotundato 

 inteqro. Oculi parvuli. Pedes breviusculi, nudi. Manus brachio vix 

 crassior, nuda, oblonga, digito triplo breviore quam manus. Tarsi 

 perbreves, valde uncinati. 



+ 



Carapax a little broader than long, bordered laterally and also behind 

 by a thin, elevated ridge, which anteriorly curves around a little 

 spirally. Beak rounded, entire. Eyes small. Feet rather short, 

 naked. Hand hardly stouter than arm, naked, oblong, finger one- 

 third as long as hand. Tarsi short and strong uncinate. 



Plate 24, fig. 6 a, animal, enlarged two and one-fourth diameters ; 

 b, under view, enlarged eight diameters. 



From a Mytilus, obtained from the reefs of Vanua Lebu, of the 

 Feejee Archipelago, near Mathuata, 1840. 



Length of carapax of a female, four lines ; breadth, five lines. 



The ridge bordering the carapax in our specimen is very thin, with 

 the edge acute. The front margin between the eyes and the elevated 

 ridge has a low angle. The eyes are very small, as in Pinnothera. 

 The legs are not hairy. The epistome is subtriangular, and the part 

 upon which the outer antennae rest is wholly separated from the 

 inner portion. The surface is unevenly pitted. 



Xanthasia murigera, A. WHITE, Ann. and Mag. Nat. Hist., xviii. 176, pi. 2, f. 3, 

 1846. 



SUBFAMILY II. HYMENICIN^E. 



The genus Hymenosoma has a projecting tooth or angle, just exte- 

 rior to the eyes, and the front is a narrow point equally projecting 

 between the eyes. There are other related species, in which the 

 margin of the carapax has no extra-orbital projection, and the eyes 

 are more distant; moreover, the front between the eyes has three 



