(RUSTA('E\ CASI'IA. 105 



« 



16 sliort articulatious. The accessory appendage (see fig. 3) is distinctly 

 defined, but rather small, and only composed of a single articulation carry- 

 ing at the tip 3 slender bristles. 



The inferior anteinia? are a little shorter than the superior and, as the 

 latter, hut sparingly setiferous. Of the joints of the peduncle the penultimate 

 one is the largest. The flagellum is about half the length of the peduncle 

 and composed of 6 ai'ticulatious. 



The buccal area is somewhat projecting, though partly concealed by the 

 1st i^air of coxal plates. The several oral parts composing it are on the whole 

 quite normally constructed. 



The anterior lip (fig. 4) exhibits the usual rounded form, and has in front 

 an obtuse prominence. 



The posterior lip (fig. 5) does not exhibit any trace of inner lobes. The 

 lateral lobes are narrowly rounded in front, and project outside as an obtusely 

 conical lappet. 



The mandibles (figs. 6 and 7) are shoit and stolit, and exhibit the usual 

 armature of their masticatory part. The palp (see fig. 7) is rather slender, 

 being considerably longer than the mandible itself, and has the last joint 

 sliorter than the 2nd. 



The 1st pair of maxilhic (fig. 8) are comparatively large, with tjie 

 masticatory lobe rather strongly developed and armed at the tip with 

 coarse, denticulated spines. The basal lobe is subtriangular in form, and 

 carries on the inner edge a row of al)out 8 sette. The palp has the terminal 

 joint on the left ma.\illa rather narrow, on the right, as usual, somewhat 

 more expanded. 



The 2nd pair of maxillfe (fig. 9) have the outer lobe considerably broader 

 than the inner, exhibiting otherwise the usual structure. 



The maxillipeds (fig. 10) in nearly all their details agree so closely with 

 those in the preceding genus, that a detailled description of them is not needed. 



The gnathopoda (figs. 11 and 12) are comparatively small and feeble 

 in structure, though distinctly subcheliform and rather densely setous. They 

 are a little unequal, the posterior ones being somewhat more slender than 

 the anterior, and having the carpus larger. The propodos of the anterior 

 pair (fig. 11) is oblong quadrangular in form and somewhat longer than the 

 carpus, with the palm rather oblique; in the posterior pair (fig. 12) it equals 

 in length the carpus and is somewhat narrower, with the palm nearly 

 transverse. 



The pereiopoda (see fig. 1) are comparatively short and stout, and rather 

 unequal in length. The 2 anterior pairs are of same structure, though some- 

 what differing in length, the 1st pair being the longer. 



•I'US.-MaT. CTp. 195. 17 13' 



