436 A. Alcock — Car etiological Fauna of India. [No. 3, 



The lower border of the orbit, in the male, extends beyond the 

 first notch of the lateral border of the carapace, its inner end is sharp 

 entire and sinuous, but all the rest of its extent is elegantly beaded. 



Chelipeds of the male three times the length of the carapace, the 

 borders of the wrist and hand, and the inner border of the wrist, 

 sharply granular or serrulate : arm long and slender, somewhat dilated 

 at its proximal end, the musical crest close to the proximal end and 

 almost on the inner border : the palm gradually increases in height from 

 behind forwards, its greatest height is about half its length, along the 

 middle of its inner surface is a row of granules ending in a granular 

 patch : fingers slender, acute, incurved, not channelled, the extreme 

 length of the dactylus is only about three-fourths that of the upper 

 border of the palm : there are no prominent lobes on the dentary edges 

 of the fingers. 



Both borders of the meropodites of the legs, as well as the anterior 

 border of the carpopodites and propodites, are spinulate. The third 

 pair of legs are nearly as long as the male chelipeds. 



In the abdomen of the male, which is narrow, all 7 segments are 

 distinct, the penultimate segment being square. 



In the female the chelipeds are very slender and are about \\ 

 times the length of the carapace, and the lower border of the orbit is 

 elegantly pectinate. 



In the Indian Museum are 11 specimens from the Sunderbunds 

 and Mergui. The carapace of the largest male is 30 millim. long and 

 40 broad. 



Sub-family Plagusiin^:, Dana. 

 Plagusia, Latreille. 



Plagusia (part), Latreille, Gen. Crust, et Ins. p. 33 (1806) : Desmarest, Consid. 

 Gen. Crust, p 126 (part): De Haan, Faun. Japon. Crust, p. 31 : Milne Edwards 

 (part), Hist. Nat. Crust. II. 90, and Ann. Sci. Nat. Zool., (3) XX. 1853, p. 178 : 

 Miers, Ann. Mag. Nat Hist. (5) I. 1878, p. 148, and Challenger Brachyura, p. 271 : 

 Kingsley, Proc. Ac. Nat. Sci. Philad., 1880, pp. 189, 223. 



Philyra, De Haan, I.e. supra. 



Carapace subcircular, depressed, the antero- lateral borders toothed. 

 The interorbital space is broad, being nearly a third the greatest 

 breadth of the carapace ; but there is no true front, so that the anten- 

 nular fossee, into which the antennules fold nearly vertically, are visible 

 in a dorsal view as deep clefts in the anterior border of the carapace. 

 The interantennular septum is broad. Orbits deep : the antennas stand 

 in the wide orbital hiatus, their flagellum is short. 



