194 Memoirs of the Indian Museum. [Voiv. IV, 1913.] 



The length of the telson, including the terminal spines, is less than its greatest 

 breadth. The submedian, intermediate and marginal teeth are represented by long 

 and slender spines placed almost in a transverse row on the distal edge. The sub- 

 medians have movable tips and a series of slender denticles on their inner margins ; 

 there are two similar denticles between the submedians and intermediates and one 

 between the intermediates and laterals. In the middle of the dorsal surface are three 

 oval bosses, the median slightly the broadest. They are smooth anteriorly ; but 

 posteriorly bear a varying number of spinules and short spines. There are also between 

 these bosses and the posterior margin two transverse rows of five spines. The spines at 

 the ends of the bosses are the shortest and those on the distal margin the longest ; 

 those of the intervening rows are intermediate in length. In the largest specimen in 

 the Indian Museum the spines are rather more numerous than in the type specimen 

 figured by Tattersall. 



The ventral process of the peduncular segment of the uropods is split into two 

 long spines, the inner a little shorter and more slender than the outer. The proximal 

 segment of the exopod projects a little beyond the insertion of the ultimate segment 

 and bears eight or nine movable spines on its external edge. The endopod and small 

 ultimate segment of the exopod bear setae on their outer margins only. The inner 

 margin of the former segment bears from four to six flat and acute spines, while three or 

 four similar spines are found on the same margin of the latter segment. 



The colouring of fresh specimens is variable. Two examples were quite pale in 

 general tone, while a third was bright brick red, faintly mottled with pale dull yellow. 

 The patches of black chromatophores which Tattersall has mentioned on the sixth 

 thoracic and first abdominal somites were conspicuous, and on the former segment 

 there were in addition a pair of lateral patches. The last somite and telson were beauti- 

 fully marbled with olive green in the pale specimens, and with dark red in the red 

 example, but the two median ridges on the last abdominal somite were pure white. 

 On the merus of each raptorial claw there was a dorsal black spot. 



This peculiar species appears to be one of the smallest known Stomatopoda. The 

 largest example in the Indian Museum is a trifle longer than either of Tattersall' s type 

 specimens. 



7 -J|^ N. Cheval Paar, Ceylon, 5 fms. T. Southwell. 3 ? , 10-11-5 mm. 



G. acanthurus was hitherto known only from two specimens found in 45-50 

 fathoms at Muttuvaratu Paar, Ceylon (Tattersall). 



