60 H. J. HANSEN. 



other; the front seta is rather short and weak. The exopods 

 are very short, generally nearly impossible to discover. The 

 last pair of legs is a little more robust than the eleventh pair, 

 which are more robust than the tenth ; the ninth has the 

 tnrsus slender. In small specimens with the full number of 

 legs the last pair of legs are less robust and the tarsus more 

 slender, but scarcely in so high a degree as in the species 

 described above. The first pair of legs (fig. 2 g) with the 

 claws (fig. 2 h) somewhat more slender than those on the 

 posterior legs, otherwise rather similar as to shape and 

 relative length; the front seta is moderately developed. 



Cerci (fig. 2 i). — Short and robust, about three times 

 longer than deep, with the distal part somewhat produced 

 (often a little more than in the specimen figured). They are 

 set with a very moderate number of setee, which gradually but 

 considerably increase in length from the base outwards; the 

 distal ones rather thin, and more than half as long as the 

 depth of the cerci. The terminal area looks outwards, and is 

 a little shorter than the distal setae. The apical seta is as long 

 as or a little longer than the longest lateral setfe, but moi-e 

 robust towards the base. 



Length.— 1-9 to 2-7 mm. 



Locality. — Isl. Koh Chang (Gulf of Siam) : under stones, 

 January 7th and 12th, 1900; under plants on stones, January 

 Gth, 1900. All collected by Dr. Th. Mortenseu. 



Remarks. — This species is distinguished from all other 

 forms of the genus by the extreme shortness of the exopods. 

 It is rather allied to S. crassicornis, but easily distin- 

 guished from it by the very long antero-latcral seta3 on the 

 scuta, by the long dorsal setas on the posterior legs, by the 

 short cerci with a very moderate number of seta), etc. ; in the 

 elongate vertical seta) on the inner side of the proximal 

 antennas it agrees essentially with S. crassicornis, but 

 differs from the other species of the genus. 



