1900.] A. Alcock — Carcinological Fauna of India. 3GI 



Carapace strongly convex fore and aft, the regions moderately well 

 defined : its lateral borders are strongly convergent, and still more so 

 are the lateral borders of the dorsal plane, which are defined in more 

 than two-thirds of their extent by a fine raised line : the posterior 

 border of the dorsal plane is contained from 2 J to 2-f- times in the 

 geatest breadth. 



Front, measured between the eye-stalks, about a twelfth the 

 greatest breadth of the carapace, its moulded and bevelled edges do not 

 together take up half its breadth. 



Orbits moderately oblique, both upper and lower borders much 

 siuuous ; the lower border finely, the upper border still more finely and 

 more distantly crenulate. 



In the large cheliped of the adult male all three borders of the arm 

 are well defined, the inner and the lower borders being crenulated, but 

 the inner border having no tooth independent of the terminal constricted- 

 off lobule ; the upper surface of the wrist and the outer surface of the 

 palm are closely covered with vesiculous granules ; and the hand 

 (fingers included) may be 3| times the length of the carapace. 



In this large hand the upper and lower borders of the palm arc 

 well defined, and of the two oblique granular crests on the inner surface 

 of the palm the upper one that runs to the dentary edge of the immobile 

 finger is short and indistinct : the fingers are not particularly broad or 

 thin, and however the teeth may be disposed, there is always one near 

 the end of each finger that is enlarged so as to give the ends of the 

 fingers, when apposed, a sort of tongs-like or forceps-like grip : the 

 dactylus is from 2 to nearly 2f times the length of the upper border of 

 the palm. 



The merus of the last pair of legs is distinctly foliaceous. 



In the Indian Museum are 92 specimens chiefly from the Sunder- 

 bunds and Mergui, but also from Karachi and the Andamans. In a 

 large specimen the carapace is 14 miliim, long and 25 broad. 



56. Gelasimus Dussumieri, Edw. 



Gelasimus Dussumieri, Milne Edwards, Ann. Sci. Nat. Zool. (3) XVIII. 1852, p. 148, 

 pi. iv. fig. 12: A. Milne Edwards, Nouv. Arcliiv. du Mus. IV. 1868, p. 71, and IX. 

 1873, p. 274: Hoffmann in Pollen and van Dam's Faun. Madag. Crust, p. 37, pi. iii. 

 figs. 19-22: Kingsley, Proc. Ac. Nat. Sci. Philad. 1880, p. 145, pi. x. fig. 16: de 

 Man, Notes Leyden Mus. II. 1880, p. 68, and XIII. 1891, pp. 20, 26, and Journ. Linn, 

 Soc. Zool. XXII. 1887-88, p. 108, pi. vii. figs. 2-7, and in Weber's Zool. Ergebn. 

 Niederl. Ost-Ind. II. 1892, p. 306, and Zool. Jahrb., Syst., VIII. 1894-95, p. 576: 

 Lenz and Richters, Abh. Senck. Nat. Ges. Frankf. XII. 1881, p. 423 : Haswell, Cat. 

 Austral. Crust, p.- 83: Miers, Zool. H. M. S. Alert, pp. 518, 541: Ortmann, Zool. 

 Jahrb. Syst. VII. 1893-94, pp. 750, 755. 



