's RIJKS MUSEUM VAN NATUURLIJKE HISTORIE — LEIDEN. 179 



apicale, bords du mérus, du carp et du propodite finement dentelés, les 

 denticules disposés en 2 — 3 séries sur le mérus. Longueur 16.5 mm.; 

 largeur 34 mm. — Rikitea". 



Death has prevented this distinguished Italian carcinologist from com- 

 pleting the preliminary diagnosis of his species in the Bull, by drawings 

 and figures. From the quoted description we may infer that M. conso- 

 brinns, which is nearly related to M. convexus, differs from this species 

 by the direction of the anterior lateral tooth which points straightly 

 outward, by the strong ridge near the under margin of the palm of the 

 male cheliped (this ridge is only faintly marked in the preceding species) 

 and by the dactylus bearing no larger tooth near the base. The species 

 seems to attain a larger size than M. convexus and in the adult the 

 carapace is fully twice as broad as long (not nearly so, as in the pre- 

 ceding species). 



M. erato de Man (PL VIII, Fig. 9). 



1888. M. erato de Man. Journ. Linn. Soc. London, v. 22 p. 125, pi. 8 



f. 12 — 14 (Mergui achipelago). 

 1895. „ erato de Man. Zool. Jahrb. Abt. Syst., Bnd. 8 p. 579 (Malakka). 

 1900. „ erato Alcock. Journ. As. Soc. Bengal, v. 69 prt. 2 p. 381 



(Mergui archipelago and Akyab). 

 1910. ,, erato Rathbun. K. Dansk. Vid. Selsk. Skr., 7. Raekke, v. 4 



p. 323 (Gulf of Siam). 



This small species, which is fully described by de Man (1888), is 

 sub quadrangular in outline, the length of the carapace being two-thirds 

 of its greatest breadth, and the latter is to be found between the tips 

 of the anterior lateral teeth ; the external orbital angles are less promi- 

 nent. Both teeth are directed obliquely outward. Upper orbital border 

 nearly straight, faintly curved, eyes not reaching end of orbits, ocular 

 peduncles thick, nearly straight. The sides of the carapace are nearly 

 parallel. 



The grooves are well marked, as de Man observed and there is a 

 faint ridge at the postero-lateral side of the carapace, just above the 

 insertion of the last legs. The middle regions of the carapace are free 

 from granules, only finely punctate, the other parts, especially the lateral 

 parts, are provided with large granules, scattered under a rather thick 

 hairy covering, which is also found in the grooves, separating the various 

 regions, but I have seen no hairs in the grooves separating the bran- 

 chial region from the cardiac area. Front broad, not constricted between 

 the eye-stalks, and occupying one-fifth (de Man) to two-ninths (Alcock) 



