531 



first 2 segments of mesosome combined, rostral projection distinct, though 

 rather short, lateral corners somewhat projecting and obliquely rounded, 

 postantennal ones inconspicuous. Anterior pairs of coxal plates somewhat 

 deeper than the corresponding segments, 1st pair considerably expanded 

 distally and, like the 2 succeeding pairs, having a small dentiform projection 

 at the infero-posteal corner; 4th pair much larger than the preceding pairs, 

 with the posterior expansion transversely truncated. Last pair of epimeral 

 plates of metasome produced at the lateral corners to an acute point, posterior 

 edge straight and minutely indented. Eyes rather large, oval quadrangular 

 in form, with very dark pigment, but with the visual elements imperfectly 

 developed. Superior antennae scarcely exceeding V* of the length of the 

 body, and reaching but little beyond the peduncle of the inferior ones, 1st 

 joint of the peduncle nearly twice as long as the other 2 combined, 3rd joint 

 very small, broader than it is long, flagellum nearly twice the length of the 

 peduncle, and composed of about 20 articulations, of which the 8 outer ones are 

 rather small; accessory appendage very fully developed, exceeding half the 

 length of the flagellum, and composed of 13 articulations. Inferior antennae 

 exceeding the superior by about 1 /s of their length, last joint of the peduncle 

 somewhat longer than the penultimate one, flagellum not nearly as long as 

 those joints combined. Anterior gnathopoda with the meral joint produced 

 below to an acute point, carpus rather short but prolonged below to a narrow 

 setiferous lobe, propodos about the length of the basal joint, and oval triangular 

 in form, palm slightly curved, and defined below by an obtuse angle armed 

 with 2 juxtaposed spines, its edge sharp, and exhibiting numerous small 

 recurved spinules and slender bristles, dactylus falciform, with 6 strong serra- 

 tions in its proximal half. Posterior gnathopoda of a similar structure to 

 the anterior, but having the propodos considerably larger, with the palm more 

 oblique and the dactylus coarsely serrated nearly its whole length, the 

 serrations being about 12 in number; those of male considerably larger than 

 in female, but otherwise of a very similar shape. The 2 anterior pairs of 

 pereiopoda very slender, with the propodal joint much longer than the carpal, and 

 edged inside with small bristles, dactylus about ] /s as long as the propodal joint. 

 The 3 posterior pairs of pereiopoda having the basal joint rather expanded and 

 regularly oval in form, with the hind edge serrate ; last pair nearly attaining 

 2 /3 of the length of the body, meral joint about the length of the carpal 

 one, propodal joint somewhat longer, and concially tapering, edged outside with 

 fascicles of slender bristles, dactylus about YS as long as the propodal joint, 

 and straight, styliform. Last pair of uropoda with the rami subequal in 

 length, the inner being, however, much broader than the outer, especially in 

 the male, and armed on the inner edge with 3 or 4 short spinules. Telson 



