1913.] S. Kemp: Crustacea Stomatopoda of the Indo-Pacific Region. 87 



The details of the carination (figs. 73 — 76) are as follows : — 



On the carapace the median carina is distinct throughout its course and is bifurcated 

 in front for half its length anterior to the cervical groove. Behind this groove there 

 are 26 to 30 longitudinal carinae, of which 18 are sharper and rather more conspicuous 

 than the rest. The carinae are least numerous in the extreme anterior part of the 

 carapace, where there are only 16 in a transverse series. The rostrum bears 5 carinae ; 

 two of these are quite close to, but distinct from, the lateral margin, and two, which 

 only extend for less than half the entire length, occur at the base on either side 

 of the well-developed median keel. There are two dorsal carinae on the basal 

 segment of the antenna and one on the succeeding segment. On the outer surface of 

 the merus of the raptorial claw there is a single long carina running forwards and 

 upwards. - 



The fifth thoracic somite bears four transverse carinae and is the only part of the 

 animal in which the carination is not longitudinal. Only the anterior carina extends 

 across the middle line. Prior to reaching the latter point the posterior one turns 

 obliquely forwards and, before arriving at the anterior margin, turns abruptly back to 

 the hinder edge. The posterior half of this somite therefore bears, near the centre, 

 four short carinae which are almost longitudinal. 



The last two thoracic and all the abdominal somites are covered with close-set 

 longitudinal carinae, most of which terminate in spines on the posterior margin. In 

 well-grown examples there are 28 on the sixth thoracic, 25 on the last thoracic and 41 

 to 45 on the somites of the abdomen. The median, submedian, intermediate, lateral 

 and marginal carinae are prominent and can easily be distinguished from the others. 

 Of these the following end in spines ;— 



Carinae. 



Abdominal somites 



Median 



1,2,3.4.5- 



Submedian 



1,2,3,4,5.6. 



Intei mediate 



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



Lateral 



3.4,5,6. 



Marginal 



2,3,4,5,6. 



There are ten or eleven carinae on either side of the median crest of the telson, a 

 few of which are not continuous. With the exception of the two innermost pairs they 

 run to the marginal teeth and to alternate denticles of the submedian and intermediate 

 series ; their exact arrangement is, however, subject to much irregularity. On the 

 underside of the telson there is a sharp post-anal crest and eight or nine other carinae on 

 either side. There are also several sharp carinae on both upper and lower surfaces 

 of the uropod and on the basal and proximal segments of the exopod. 



Apart from the disposition of the carinae, S quitta multicarinata differs from 5. 

 costata in the following features : — 



The carapace is broader than in 5. costata and its anterior breadth is a little less 

 than half its median length including the rostrum. The antero-lateral spines are 

 considerably shorter. The eyes are more expanded and the cornea is set trans- 

 versely on the stalk. . The mandibular palp is present and composed of three 



