436 G. 0. SARS, 



very conspicuous umboniform prominence, which extends obliquely down- 

 wards, and is obtusely rounded at the tip. 



The anterior pairs of coxal plates are rather large, fully twice as deep 

 as the corresponding segments, and have the distal edge slightly crenulated, 

 and fringed with short bristles. The 1st pair (see fig. 11) are but little ex- 

 panded distally, and are rounded at the tip. The 2 succeeding ones (see fig. 12) 

 are oblong quadrangular in shape, being transversely truncated at the tip. 

 The 4th pair are but little broader than the preceding ones, and exhibit 

 posteriorly a slight emargination, defined below by an obtuse angle. 



The 3 posterior pairs of coxal plates are comparatively small, and 

 rapidly diminish in size, the antepenultimate pair (see fig. 14) having the 

 anterior lobe considerably deeper than the posterior. 



The epimeral plates of the metasome are well-developed, but have all 

 the lateral coi-ners rounded ofi'. 



The urosome is rather short and stout, being perfectly smooth, without 

 any dorsal spines or hairs. 



The eyes (see fig. 3) are of moderate size, and oblong oval in form. They 

 are slightly protuberant, and are placed close to the anterior edges of the head. 



The superior antennae (fig. 3) equal about % of the length of the body, 

 and are rather slender, with the 1st joint of the peduncle fully as long as 

 the other 2 combined. The flagellum is somewhat longer than the peduncle, 

 and composed of about 12 articulations. The accessory appendage is ex- 

 tremely small, though, on a closer examination (fig. 3a), it is found to con- 

 sist of 2 well-defined articulations, the outer of which, however, is so very 

 minute, as easily to escape attention. 



The inferior antennae (fig. 4) are of very inconsiderable size, being 

 scarcely more than half as long as the superior, and have the last joint of the 

 peduncle much smaller than the penultimate one. The flagellum scarcely 

 exceeds in length the last peduncular joint, and is only composed of 4 arti- 

 culations. 



The oral parts (figs. 5 — 10) on the whole agree in their structure with 

 those in the genus Gmelina, and need not therefore be described in detail. 



The gnathopoda are rather unequally developed, the anterior ones (fig. 1 1) 

 being much more powerful than the posterior (fig. 1 2). The propodos of the 

 former (fig. 1 1) is very large, and oblong oval in form, with the palm rather 

 oblique, and defined below by an obtuse corner, carrying a strong spine. The 

 propodos of the posterior gnathopoda (fig. 12) is scarcely half as large, and 

 is of oblong quadrangular form, with the palm nearly transverse. 



The pereiopoda are rather slender and edged with fascicles of delicate 

 bristles. The 2 anterior pairs (fig. 1 3) are of quite normal structure. Of the 



"^BB.-MaT. CTp. 266, 1 6 



