37 



Description. — Body moderately robust. Carapace in both sexes somewhat produced, 

 the frontal plate (fig. 2 a) being a broad, rather low triangle with the vertex a little or some- 

 times somewhat produced, acuminated and acute. Eyes very large, black. Antennular peduncles 

 in the male fairly slender. Antennal squama in the female not fully three and a half times as 

 long as broad, in the male (fig. 2<$) a little more slender, between three and a half and four 

 times as long as broad; terminal lobe in both sexes much broader than long. Gnathopods as 

 in the following species somewhat robust, a little shorter than first pair of thoracic legs which 

 are slender beyond the middle; second pair of thoracic legs slightly longer than the first. 



Pseudobranchial rami on second to fourth pairs of male pleopods spirally twisted (figs. 2c 

 and 2(/). Both rami of the fourth pair of male pleopods (fig. 2c) distinctly longer than those of 

 second pair (fig. 2 c), subsimilar in length and both showing special development ; the endopod 

 (fig. 2/) with the three distal joints as usually rather slender, its last joint terminating in a 

 feebly curved, very thick and extremely long, stiff, spiniform seta which is longer than the sum 

 of the three distal joints, feebly feathered on less than its proximal half and with the end acute ; 

 finally a very thick, spiniform seta, which is less than half as long as the other and feebly 

 feathered, originates from the inner margin of the joint a little before the end, while the two 

 setae inserted on the end of the penultimate joint are nearly normal. The exopod (fig. 2^) with 

 the antepenultimate and the penultimate joints somewhat thick and considerably widened from 

 the base to the end, while the last joint is rather slender and terminates in an extremely long, 

 stiff seta, which is still a little thicker and longer than that on the endopod, scarcely curved, 

 nearly naked, with the end blunt and showing a peculiar structure (fig. 2 /i) ; finally a thick, 

 spiniform seta, which is less than half as long as the other and naked, originates from the inner 

 margin of the joint a little before the end, while the two setae on the end of the penultimate 

 joint are nearly normal and feathered, and a third seta originating from the distal inner angle 

 of this joint is strongly chitinised, quite naked, somewhat thick at the base and distally thin 

 and curved. 



Uropods rather slender; the exopod, which conspicuously overreaches the endopod, with 

 14 to 16 marginal spines, the most proximal three or four with larger intervals and frequently 

 more so than on fig. 2 /, and the distal joint scarcely twice as long as broad. Telson about 

 three times as long as broad, scarcely or slightly reaching beyond the articulation of the exopod, 

 distally somewhat slender and with at least the distal third of the lateral margins perceptibly 

 concave (fig. 2 /&) ; along this distal j^art generally 3 or 4 shorter spines, gradually increasing 

 in length backwards, are found between each two of the rather long spines, while the most 

 distal lateral spine or the two most distal lateral spines are rather long, though much shorter 

 than the terminal pair of long spines. 



Length of the male 11 — 11.6 mm., of the female 11. 3 — 12 mm. 



Remarks. — The male of this species is easily distinguished from the same sex of 

 the three other forms of this group by the length and shape of the distal setee on fourth pair 

 of pleopods, while the female is very difficult or sometimes perhaps impossible to separate 

 with certainty from that of S. media^ the best character probably being, that the eyes are 

 a little larger in 5. inornata than in 5. media. Furthermore S. inornata is closely allied to 



