1913 ] S. Kemp : Crustacea Stomatopoda of the Indo-Pacific Region. 83 



abruptly before reaching the anterior edge. The dactylus is provided with five teeth 

 including the terminal one and its outer margin is evenly convex and obscurely lobed 

 at its proximal end. 



The last three thoracic somites possess the usual submedian and intermediate 

 carinae and between these, in the anterior half of the somite, each bears a short and 

 rather obscure keel directed outwards and forwards. The fifth somite is bilobed 

 laterally; the anterior lobe consists of a long and sharp antrorse spine, the posterior is 

 short and bluntly rounded. The margins of the two following somites are not 

 bilobed, but are obliquely truncate (more squarely than in 5. laevis or S. hieroglyphica) 

 and are rounded posteriorly. 



The first five abdominal somites, in addition to the usual eight longitudinal carinae, 

 possess also a sharp and distinct median keel. This carina never terminates in a 



spine : — 



Carinae. Abdominal somites. 



Submedian . . . . . . 5,6. 



Intermediate .. .. .. 5,6. 



Lateral .. .. .. .. (i) 1 (2)' 3, 4, 5, 6. 



Marginal .. .. .. 1,2,3,4,5,6. 



The telson is rather longer than broad, and is sharply distinguished from the ma- 

 jority of the preceding species by the prominent carination of its dorsal surface. The 

 median carina is well developed and terminates in a sharp spine overhanging a small 

 tubercle. On either side there is a deep longitudinal groove formed by a number of 

 confluent pits and beyond this there is a well-marked longitudinal carina continued 

 with or without interruption to the apex of the submedian spines. Each of the usual 

 oblique rows of pits is replaced by a rather deep groove and the surface between the 

 grooves is raised, forming three or four short 2 but distinct oblique carinae on either 

 side of the median ridge. On the edge of the telson the usual six teeth are well deve- 

 loped and there is a prominent praelateral lobe. There are three or four submedian 

 denticles, six or seven intermediate and one lateral. The post-anal crest is absent. 



In the bifurcate process from the base of the uropod, the outer margin of the longer 

 spine bears the usual lobe near the distal end of its proximal half ; the margin anterior 

 to this lobe is straight or feebly convex. The inner margin of the process is slightly 

 serrate. 



The secondary sexual distinctions appear to be rather pronounced. In the single 

 large male the submedian carinae of the fifth abdominal somite, all the carinae of the 

 last somite and the median and marginal carinae of the telson, are conspicuously 

 swollen (fig. 69) and the propodus of the raptorial claw is strongly dilated at its distal 

 end (fig. 69). 



The large male specimen, examined shortly after capture, exhibited a considerable 

 amount of lemon yellow colouration on the abdominal somites, telson and raptorial 



1 In the large male specimen only. 



a In the large male these carinae are extremely short, little more than rounded tubercles, and the 

 grooves are less conspicuous (fig. 69). 



