476 (i. 0. SAKS, 



The urosorae is comparatively small and perfectly smooth, with no traces 

 either of hairs or spines. 



The eyes are well developed, and of an almost orbicular form, with 

 dark pigment. 



The superior antennse (fig. 14) scarcely exceed in length ^j^ of the body, 

 and have the peduncle comparatively short, with the 1st joint much the 

 largest, exceeding in length the other 2 combined. The flagellum is some- 

 what longer than the peduncle, and is composed of 10 very sharply-defined 

 articulations carrjdng, on both edges, small, hair-like bristles. The accessory 

 appendage is extremely small, so as easily to escape attention, the more so 

 as it generally lies inside the base of the flagellum. On a closer examination 

 it is, however, found to be composed of 2 well-defined articulations. 



The inferior antennae (fig. 15) are quite unusually poorly developed, being 

 scarcely half as long as the superior, and have the basal joint globulai-ly 

 tumefied. The last joint of the peduncle is somewhat smaller than the pen- 

 ultimate one, both having at the end a few small bristles. The flagellum is 

 about half the length of the peduncle, and is composed of 4 articulations. 



The buccal area is somewhat protuberant, not being covered laterally 

 by the Ist pair of coxal plates. The oral parts composing it, differ in some 

 points rather markedly from those in the other Gammaridae. 



The anterior lip (not figured in tlie plate) is rather small and rounded, 

 without any projection in front. 



The posterior lip (fig. 1 7) is normally developed, with the lateral lobes 

 slightly incurved at the tip, and produced laterally to an obtuse auricular 

 projection. 



The mandibles (fig. 16) are comparatively small, and have the cutting 

 part divided into 2 slightly dentated lamelke, which are remarkably narrow, 

 almost spiniform. Between this part and the rather poorly developed molar 

 expansion, only 3 small bristles occur in each mandible. The palp is nor- 

 mally developed, being considerably longer than the mandible, and is but 

 sparsely setiferous. The terminal joint is somewhat shorter than the middle 

 one, and somewhat compressed, with a row of small spinules along the distal 

 part of the inner edge. 



The 1 st pair of raaxillfe (fig. 18) are highly remarkable for the rudi- 

 mentary condition of the palp, which is extremely small, so as scarcely to 

 extend beyond the masticatory lobe. On a closer examination, it is found to 

 be composed of 2 nearly equal-sized joints, the outer of which terminates 

 with 2 small bristles. The masticatory lobe is rather broad and armed at 

 the truncated tip with a number of strong, denticulated spines. The basal 

 lobe is much smaller and carries 3 ciliated setae. 



'^U3.-MaT. CTp. 300. c6 



