TO INDIAN CAKCINOLOGY. 355 



lations are more pronounced on the carapace, and they occur even on the mesogastric 

 lobe and towards the lateral and posterior margins of the carapace, whereas in the other 

 specimens they are deficient in these localities. In a third species, L. Eydouxii, A. Milne- 

 Edw., the only difference of importance is that the gastric region is less distinctly 

 lobulated, and the lobes separated merely by shallow grooves. It is perhaps possible 

 that all three are varieties of a single variable species. The largest specimen, a male, 

 has the carapace 35 mm. long and 49 mm. broad. 



Distribution. Prom the Red Sea and E. Africa to the Pacific. 



19. Lophact^a semigranosa (Heller). 



Atergatis semigranosus, Heller, Sitzungsb. kais. Akad. Wiss. Wien, p. 313 (1861). 

 Lophacteea semigranosa, A. Milne-Edwards, Nouv. Arch. Mus. Hist. Nat. t. i. p. 248 (1865) j De Man, 

 Brock's Crust, p. 246, tat*, viii. fig. 4 (1888). 



Muttuwartu Par, two males and a female with ova {Thurston) ; Pameswaram (J. B. H.). 



These agree well with a specimen in the British Museum from Suakim, though 

 in the Indian specimens the crest on the upper margin of the hand is more strongly 

 marked. The anterolateral margin of the carapace somewhat resembles that of a 

 Lophozozymus. The carapace is granulated anteriorly and towards the sides, smooth 

 posteriorly ; but De Man has recently pointed out that the entire surface may be granu- 

 lated. The carpus and propodus of the chela? are granular externally, with the granules 

 arranged in lines, and a large tooth is present on the inner surface of the immobile finger. 

 The ambulatory legs are carinated, but not granulated, and have ciliated margins. 

 The largest specimen, a female with ova, is 9 mm. long and 13 mm. broad. 



Distribution. Red Sea, Amirante Is., Malay Archipelago. 



50. Lophact^a fissa, n. sp. (Plate XXXVI. figs. 8, 8 a). 



Tuticorin, a male (Thurston). 



The areolation and armature of the carapace are similar to those of L. granulosa, except 

 that the granules are somewhat fewer in number, and towards the sides of the carapace 

 they tend to become spinulose ; a smooth transverse area also exists near the posterior 

 margin. The lateral margins are scarcely so produced as is usual in the genus, and the 

 spiniform granules extend on to them ; three wide open fissures are met with, two close 

 together anteriorly, and the posterior one near the hinder termination of the antero- 

 lateral margin. The portion of the antero-lateral margin contiguous to the orbit, i. e. 

 between the latter and the first fissure, is straight, thickened, and separated from both 

 the upper and the lower orbital margin by a very narrow fissure ; a second narrow fissure 

 is present as usual in the upper orbital margin. The frontal lobes are regularly rounded. 

 The antennal peduncles and external maxillipedes are similar to those of L. granulosa. 



The chelipedes are like those of L. granulosa, i.e. strongly tuberculated externally; 

 the fingers are black, compressed, and ridged externally, with a well-marked internal lobe 

 on the immobile finger. The ambulatory legs have the carpal and propodal joints rather 

 less carinated than usual, and their posterior surfaces (especially of the propodi) strongly 

 granulated ; well-marked articular facets are present between these joints on each leg. 



