Garcinological Fauna of India. 397 



wrooves are present oti the lateral parts of the branchial regions : tlie 

 antero-latei'al, or outer orbital angle, is acute, but there are no teeth on ^" h-fi-^^ -- 

 the lateral border behind it. 



Front very broad, more than half the extreme width of the 

 carapace, deflexed : along the line of flexion are four depi esged lobes, the 

 outer one of which on either side sometimes shows a tendency to split 

 into two. 



Orbits of moderate size, occupying the corners of the carapace : 

 the lower border is notched near its outer end : the orbital hiatus is 

 filled by a special lobe which belongs to the inner of the two fossre into 

 which the orbit is divided and tin's lobe completely excludes the 

 atitennje from the orbit. The antennules fold nearly transvei'sely in 

 fosspe of good size. The antennte have a short nnd slender flawellum : 

 the basal joint of the peduncle is not very massive. 



Epistome well defined, but short fore and aft. Buccal cavity 

 square with the anterior cornei's rounded off. The external maxillipcd.s 

 leave between them a rhomboidal gap in which the mandibles are 

 exposed : the moms is shorter than the ischium, and carries the coarse 

 palp at or near the antero-external angle. 



Chelipeds either subeqaal or unequal, the larger one mueh more 

 massive than the legs but shorter than tlio '2nd and 3rd pairs oP these : 

 fino"ers rather short and stout, with the tip spooned. 



Legs broad and compressed, especially as to the merus, which 

 joint — like the arm of the chelipeds — usually has some .sqnamifoi'm 

 markings : the last three joints have bristly edges and the dact^-lns is 

 thorny. 



The abdomen in both sexes consists of 7 separate .segments, and 

 in the male its base is as broad as the sternam between the last pair 

 of legs. 



An Indo-Pacific genus. 



86. Metojwgrapsus messor (Forskal) Edw. 



Cancer messor, Forskal, Descrip. Anim. in itin. orient, p. 88. Gmpsux niessoi-, 

 Milne Edwards, Hisfc. Nat. Crnsfc. II. 88 : Kraiiss, Sndafr. Crnsc. p. 43 : Hoffmann in 

 Pollen & Van Dam, Fann. Madag. Cinst. p. 23 : Sluiter, Tijds. Nederl. Ind. XL. 

 1881, p. 164. Metopograpsus messor, Milne Edwards, Ann. Sci. Nat., Zool., (3) XX. 

 1853, p. 165: Heller, SB. Ak. V\'ien, XLTII. 18fil, p. 362, and Novara Crnst. p. 44: 

 A Milne Edwards, Nonv. Archiv. dn Mns. IV. 18G8, [>. 71: Kossmann, Reise roth. 

 Meer., Crnst. p. 57: Hilgendorf, MB. Ak. Berl. 1878, p. 808: Mierg, Phil. Trans. 

 1879, p. 489, and Zool, H. M. S. Alert, pp. 184, 245, 518, 545, and Challenger 

 Brachynra, p. 258: de Man, Notes Leyden Mus. II. 1880, p. 183, and Jonrn. Linn. 

 Soc. Zool. XXII. 1887-1888, p. 144, pi. ix. fig. U, and Archiv f. Naturgee. LIII. 1888, 

 i. p. 361, pi. XV. fig. 6, and in Weber's Zool. Ergebn. Niederl. Osfc. Ind. II, p. 314: 



