]\Q A. Alcock — Carcinological Fauna of India. [No 1, 



Sub-genus Lophoxanthus, A. Milne Edwards. 



Lophoxanthus, A. Milne Edwards, Miss. Sci. Mex. Crust, p. 256. 



Differs from typical Xantho (Xantho floridus etc.) chiefly in having 

 at least the upper edge of the legs distinctly crested : the carapace, 

 moreover, is longer and narrower. 



43. Xantho (Lophoxanthus) scaberrimus, Walker. 



Xantho scaberrimus, A. 0. Walker. Journ. Linn. Soc, Zool., XX. 1886-90, 

 pp. 109, 115, pi. vii. figs, 1-4. 



Carapace about £ as long as broad, moderately convex in the 

 anterior two-thirds ; regions and subregions strongly defined by broad 

 deep smooth channels, convex, and covered with smooth well-defined 

 tubercles that are pea-like in the posterior third, somewhat scale-like 

 in the anterior two-thirds, and pointed along the anterolateral border. 



Fronto-orbital border less than half the width of the carapace : 

 front two-lobed, the lobes having an oblique and slightly concave 

 margin and a well-defined external angle. 



Antero-lateral border four-lobed, the first lobe blunt and non- 

 prominent, the other three prominent and acuminate, all four with the 

 edges serrulate. Postero-lateral margiu not concave, granular ; posterior 

 margin beaded. 



The whole under surface of the carapace, and the surfaces of the 

 external maxillipeds, male sternum and male abdomen, are closely 

 covered with large granules. 



Chelipeds equal, uniformly closely covered (except upper surface 

 of arm and inner and outer surfaces of fingers) with sharpish tubercles, 

 which are largest on the hand, where they fall into raised longitudinal 

 parallel series, most marked on the lower part of the outer surface : fingers 

 fluted in continuation of the ridges on the hand, the ridges of the 

 dactylus being rough in their basal part. Two tubercles, the anterior 

 of which is the larger, at the inner angle of the wrist : and two some- 

 what foliaceous excrescences terminating the crest-like upper edge of 

 the arm. 



First three pairs of legs with the edges of the merus ( but especi- 

 ally the upper edge) sharply crested, the upper edge of the carpus and 

 propodite strongly serrated, and the dorsal surface of the carpus and 

 propodite furnished with squamiform granules in series parallel with 

 this serrated crest. The last pair of legs resembles the others, except 

 that the crest of the merus is serrated, and the dorsal surface of the 

 inerus is granular. 



Colours in spirit uniform ashy white. 



