12 



longer than the outer margin of its distal joint ; the stalk is manifestly longer than in 5". robustus. 

 The antennulae in the main as in 5". robustus^ but second and third joints of the peduncle are 

 distinctly less thick, especially third joint is longer in proportion to its depth than in S. robustus, 

 and there is much less difference between the thickness of its proximal part and near its end 

 than in the species named ; furthermore third joint is similar in both sexes, somewhat compressed, 

 and conspicuously shorter than second joint. The antennal squama is rather far from reaching 

 the middle of the third peduncular joint of the antennulae; it has the terminal margin of 

 moderate length, a little convex and nearly transverse, arid the marginal spine is well developed. 

 The terminal joint of third maxillipeds is divided into four joints subequal in length, but each 

 of the two distal subjoints is again divided into two joints; the result is thus six subjoints in 

 all. Fourth pair of legs, when stretched forwards, reach a little beyond the apex of the rostrum ; 

 the two distal joints are proportionately narrower than in S. Gardineri. The posterior branchia 

 above third pair of legs is a little more than two-thirds as long as the anterior, and about as 

 " long as the second branchia above fourth legs, while this last-named branchia is scarcely three- 

 fourths as long as the anterior branchia above the same legs. All these four branchiae ar£ long 

 and closely set, rather similar to those in 5. robustus, from which they differ in the feature, 

 that the posterior branchia of each of the two sets is shorter in comparison with the anterior 

 branchia of the same segment than in 5. robusttis. 



Alcock's description of the petasma is completely insufficient. — Lamina externa [lam.) 

 of pars externa is short, much shorter than processus uncifer {pu.), with the outer margin feebly 

 angular a little beyond the middle, and its proximal part nearly straight; processus uncifer is 

 uncommonly slender, with the subterminal incision normal, somewhat deep. Processus basalis {pb.) 

 is nearly straight, rather slender, moderately short, slightly broader beyond the middle than at 

 the base, with the distal fourth rapidly tapering to the acute end. Processus ventralis {pv.) is 

 rather long, moderately strong, a little curved, tapering a little from the base to the middle, 

 while the distal half widens gradually a little again and then tapers to the acute end. Lobus 

 armatus [la.) is long, reaching beyond the processus ventralis; it is somewhat curved, thick at 

 the base and then tapering considerably ; the distal half is moderately slender, keeping at least 

 the same thickness to the oblong and tapering terminal part; the obtuse end has a very large 

 hook ; on the inner side a large hook is found considerably beyond the middle and a smaller 

 hook near the middle, while the proximal half of the inner margin has about seven small hooks, 

 some of them even shaped as acute, somewhat curved papillae. Lobus connectens [Ic.) is, seen 

 from behind (fig. 3^), nearly totally overlapped by the lobus terminalis; it is moderately short, 

 thick (fig. 3rt'), tapering to the truncate end which has a couple of hooks, while some minute 

 hooks are found on the distal part of the inner margin. Lobus terminalis {/t.) is rather long, 

 curved, its basal third very thick, as it is expanded on the outer side, and the outer margin 

 of this part has about seven small hooks; the distal two-thirds taper to the truncate end which 

 has a very large hook. Lobus inermis (//.) is somewhat shorter than lobus connectens but reaches 

 to its end; it is moderately stout at the base but tapers rapidly, so that its distal third is very 

 slender; it has no hooks. 



Length cannot be stated with accuracy, as the adult specimens are much curved. The 



