pleural plates of the foiirth somite are produced anteriorly on each side into a narrow rounded 

 lobe defined above by a deep notch. The last three thoracic somites are ornamented with 

 longitudinal ridges similar to but less distinct than those to be described on the abdominal somites. 



The abdomen is longer by nearly two-thirds than the cephalothoracic region and the 

 anterior somites are as broad as and a little deeper than the posterior thoracic somites. Each 

 somite has three pairs of longitudinal ridges on its surface, one pair dorsal, one dorso-lateral, 

 and one lateral. These ridges are not very prominent; the lateral pair are low and rounded 

 and do not reach to the posterior end of the somite. On the fifth somite, which is longer by 

 one-third than the preceding, the lateral ridge unites with the dorso-lateral at about the middle 

 of the somite. The last somite, which is about as long as the fourth, is somewhat depressed, 

 with well marked lateral ridges and a pair of slighdy marked longitudmal ridges close together 

 on the anterior part of the dorsal surface. The supra-anal lobe lying between the bases of the 

 uropods is nearly square and its surface is raised into a prominent rounded eminence. Just in 

 front of this the dorsal surface of the somite is crossed by a crescentic groove with the ends 

 turned forwards. 



The antennules are of moderate length, the first and third segments of the peduncle 

 longer than the second. The external flagellum (PI. I, fig. 9) is nearly one half the length of 

 the last segment of the peduncle and is composed of three segments of which the second and 

 third are very small ; the first is swollen at the base on the lower and inner side, where it 

 bears a tuft of very long sensory filaments. The internal flagellum has a somewhat unusual 

 form. It is composed of two segments, the proximal forming a nearly hemispherical cushion half 

 as broad as the last segment of the peduncle and carrying a dense brush of fine, rather stiff, 

 sensory filaments, much shorter than those on the e.Kternal flagellum ; the second segment is 

 narrow, not more than V5 the thickness of the first and about as long, hearing three short setse. 



The antenna is about as long as the body. The sensory hairs on the anterior surface 

 of the peduncle are less numerous than usual. The flagellum is composed of numerous short 

 segments. About the middle of its length they are but little longer than broad. At the tip 

 however they are long and slender. 



The third ma.xilliped (PI. I, fig. 10) has a long und slender basis, two and a half times 

 as long as the remaining segments and nearly twice as long as the exopod. Its outer and inner 

 margins are clothed with numerous plumose setae and its distal outer angle is produced into a 

 large rounded lobe which extends beyond the merus. The merus is slightly expanded externally 

 where it bears several teeth. The carpus is toothed on its inner edge. The propodus is narrow 

 and subequal to the dactylus. 



The first legs (PI. I, fig. 11) are nearly twice as long as the carapace. The basis is 

 slender, not quite two-thirds the length of the remaining segments, and about 1V2 times the 

 length of the exopod, having plumose setae on both margins and a series of spines on the 

 inner margin, with a longer stout spine at the distal end. The short ischium has a stout tooth 

 internally. The merus is a little shorter than the carpus which is finely serrated on the outer 

 and inner edges. The propodus is slender, twice as long as the carpus, and a little longer than 

 the still more slender dactylus. 



