i^2 Memoirs of the Indian Museum. [Vol. IV, 



angles are not spinous! The posterior margin of the sixth somite is straight or slightly 

 convex in dorsal view, and on its dorsal surface there are six rounded longitudinal 

 ridges, the outermost of which are coterminous with the acute postero-lateral angles- 

 The four median ridges are distally rounded in the two type specimens and in two 

 which I have examined ; but in another example — a small one — each of the subme- 

 dians terminates in a minute spinule. 



The telson is much broader than long and bears on either side near the anterior 

 margin, the small rounded tubercle which occurs in most of the preceding species. In 

 the middle of the dorsal surface are three ridges that are smooth anteriorly, but poste- 

 riorly tend to break up into a few large tubercles. The median ridge is much wider 

 than the other two and, in the specimens examined, bears three tubercles at its distal 

 end and sometimes one other, much less distinct, on either side near the middle. Each 

 submedian ridge is composed of an elongate anterior portion, and a large rounded 

 posterior tubercle, the latter being sometimes entirely separate from the former. 1 The 

 tubercles in the type specimen are rather more numerous, as will be seen by comparing 

 pi. X, fig. 114 with the figure given by Tattersall. On the margin of the telson 

 the submedian and intermediate teeth are large and well- developed ; the former have 

 movable tips but bear no spinules on their inner margins ; the intermediate denticle is 

 obsolete. Each tooth is strengthened by a dorsal carina broken up into a small number 

 of large tubercles. The lateral marginal teeth take the form of lobes ; they are com- 

 paratively prominent in the type, but in the specimens examined are very broadly 

 rounded. 



The peduncular segment of the uropod is carinate dorsally and terminates in a 

 stout spine projecting over a similar carina on the proximal segment of the exopod ; 

 the ventral process is composed of two spines of equal length, the outer a little broader 

 than the inner. The first segment of the exopod projects far beyond the articulation 

 of the second segment, and on its outer margin bears an even series of ten or eleven 

 spines. The outermost spines are slightly recurved : more so than is ever the case with 

 G. chiragva. The terminal segment is comparatively long; it is strongly carinate above 

 and bears setae only in the distal half of its outer margin. The endopod is a com- 

 paratively solid structure, not laminar as in the preceding species. It is more or less 

 crescentic in shape with a concave inner margin and ends anteriorly in a subacute 

 angle well in advance of its point of articulation with the peduncular segment. It 

 bears a strong carina near its external edge and inwards of this carina is feebly ridged 

 longitudinally both above and below. Setae are present only on the outer half of its 

 distal margin. 



Living specimens are quite pale in colour with dull yellow marbling, darkest at the. 

 antero-lateral corners of the abdominal somites and tending to a more reddish tone on 

 the sixth somite and telson. The ridges and tubercles of these last two segments are 

 pure white. The propodus of the raptorial claw has a red-brown patch at the extreme 

 distal end, and near the apex of each of the rostral spines, there is a transverse red band. 



1 In an abnormal specimen from the Colombo Museum the left submedian ridge is absent ; but its 

 distal tubercle persists. 



