H9 



with the two distal joints very slender and the third conspicuously longer than, but not one- 

 third as long again as, the second ; the upper flagellum is slightly shorter than the lower and 

 about as long as the peduncle, and both flagella are extremely slender, 8-jointed. In the male 

 antennulse (figs. 4^ and 4^) the two distal peduncular joints are somewhat shorter and much 

 thicker than in the female; the upper flagellum is about as long as the peduncle and conspicuously 

 shorter than the lower; the distal half of both flagella is distinctly flattened and sometimes even 

 conspicuously expanded, the lower flagellum being compressed, the upper depressed, and in 

 such flagella the joints are much easier to count than in the female; each flagellum is 8-jointed, 

 with the first joint long, the second short and the others increasing in length to the last; besides 

 the first joint of the lower flagellum is longer than that of the upper and much thickened 

 towards the base, with the usual sensory filaments. The antennal squama is long and very 

 narrow, 13 — 14 times as long as broad a little behincl the base of the marginal tooth, with a 

 terminal lobe about as long as, or longer than, broad. 



The false chelae of the long legs nearly as in S. insularc, mainly differing in having 

 the proximal spine on the penultimate joint and the proximal spines on the upper margin of 

 the terminal joint somewhat but not much longer than in that species. Sixth abdominal segment 

 from considerably less to a little more than half as long again as deep, with the lower margin 

 rounded somewhat flatly towards the end. The endopod of the uropods is distinctly a little 

 longer than the exopod, reaching about to the middle between the end of the telson and the 

 insertion of the distal long spines. 



The copulatory organs (figs. 4c and /\.d) are rather similar to those in the other species 

 of the group. The spine-shaped process is somewhat long, strongly bent inwards before the 

 middle. The terminal process is moderately short, with the rather short basal part directed 

 obliquely outwards, forming at the inner side an obtuse angle with the major distal part which 

 proximally is less broad, but increases again somewhat in breadth towards the end, and here 

 the inner margin is convex and rounded, the outer obliquely cut with two or three saw-teeth. 

 The proximal process is about as long and broad as the terminal, but its proximal part is not 

 bent, at the middle it is somewhat narrowed, while it is widened again towards the distal end, 

 at which the inner and the terminal margins are a continuous curve, the outer margin straight. 

 The lateral process, which is inserted close at the base of the proximal, has almost exactly the 

 same shape, but is somewhat shorter and distinctly more than half as broad. It may be added 

 that all three processes are distally plate-shaped and, seen from in front, even somewhat spoon- 

 shaped, as the real distal inner and terminal margin is bent somewhat forwards. The auxiliary 

 lobe is minute. 



Length of the male 6 mm., of the female 7 — 8 mm. 



Remarks. - This species is allied to 5. longicomc G. O. Sars (see below), but it is 

 still more similar to S. Suhmii G. O. Sars (= S. mastigophorum Chun, partim). Of S. Suhmii 

 I have examined the type from the Pacific (North of New Guinea) in the British Museum, 

 some other specimens from the Pacific and a fairly good number from the North Atlantic; all 

 these specimens - - when adult - - agree with each other in having the upper part of the eyes 

 distinctly narrower and, seen from the side, with only three well developed crystal cones in a 



