obtained in the Indian Seas. 259 



borders forming together a strongly convex arch ; the postero- 

 lateral borders strongly convergent ; the fronto-orbital border 

 much more than half the greatest width of the carapace. 



The anterior two thirds of the carapace are markedly 

 areolatcd and peculiarly grannlar ; the granules are bead- 

 like and for the most part arranged in transverse rows, these 

 rows occupying the tops of successive small ridges, which 

 look like wavelets or ripples moving in a forward direction. 

 Between these rows of granules and in tiie grooves defining 

 the regions the carapace is smooth. The margins and sides 

 of the carapace, along with the posterior third of the surface, 

 are fairly uniformly studded with granules. No hairs on 

 carapace. A sinuous groove marks off the fronto-orbital 

 region ; the gastric region is defined and divided into three 

 subregions by similar deep grooves^ while a shallow longi- 

 tudinal groove on either side divides the lateral gastric sub- 

 regions in two ; the branchio-hepatic regions are divided by 

 grooves into about four areas (a marginal, two dorsal, and 

 an internal triangular one). 



Front bilobed ; the outer angle is not sharply marked 

 off, and from it pass inwards two beaded ridges, which give 

 the front the appearance of having a double edge. The 

 outer angle is separated from the supraorbital margin by a 

 well-marked notch. Antero-lateral border divided into 

 four granular lobes or teeth. Between the first tooth and 

 the external orbital angle there is a depression which allows^ 

 in a dorsal view, a small tubercle to be seen ; this tubercle 

 lies close to the first tooth of the antero-lateral border and 

 lies in a line between it and the angle of the buccal cavity. 

 The third lobe or tooth is largest, the first smallest; the 

 second and fourth are about equal. 



The three grooves of the orbital border are distinct. The 

 inner and outer ends of the lower orbital margin end in 

 teeth, the inner being much the larger. The basal antennal 

 joint is short and just reaches the front. A small dog's-ear- 

 shaped flap projects from the eye-stalk on to the dorsal 

 aspect of the cornea, and on this stands a tuft of setae. 

 There is a transverse row of granules on the front of the 

 eye-stalk just internal to the cornea, the uj)permost granule 

 being usually enlarged and dentiform. 



The anterior edge of the merus of the external maxilliped 

 is almost transverse; there is a notch in it just external to 

 the inner angle. The longitudinal ridges that define the 

 eflei'ent branchial canals are indistinct and do not I'cach the 

 anterior boundary of the buccal cavern. 



The chelipeds are not twice the length of the carapace ; 



