236 University of California Publications in Zoology. [Vol.4 



21). The latter in situ reach but little beyond the base of the 

 third segment of the second pair, the basal segment is very much 

 depressed and broadened and bears a long spine near the apex of 

 the middle of the inferior surface; this segment is about one- 

 third longer than the second ; the third segment al)out half as 

 long as the second ; tlagellum slightly shorter than the peduncle : 

 the basal segments longer than those beyond. The basal segment 

 of the second antennae bears a blunt lobe beneath; the next seg- 

 ment is elongate, one and two-thirds as long as broad, and with- 

 out spines; three-fourths of the way to the apex along the in- 

 ferior margin of the third segment, arises a large, stout, curved 

 spine, with a small one of similar shape at its base within; the 

 ultimate segment sub-cylindrical, distinctly arced, with a down- 

 ward projecting lobe at its apex one one side, and a tooth beyond 

 the first quarter of the inferior margin; flagellum scarcely one- 

 half as long as the ultimate segment of the peduncle; first seg- 

 ment over four times as long as the second; the ultimate segment 

 minute, bearing two small curved spines and a tuft of setae 

 longer than the entire flagellum. What I take to be a very young 

 male (pi. 11, fig. 24) does not differ from the second young 

 female described above ; in the male of medium growth, about the 

 size of the adult female described above, the condition is about 

 as there stated, except that the third joint of the second antennae 

 is considerably stouter, and there is a large spine near the base 

 of the fourth. 



Inner plate of first maxillae (pi. 11. fig. 25) nearly obsolete, 

 the outer bearing seven spines, three of which are bifid; the palp 

 two segmented ; the second segment over four times as long as the 

 first, bearing on its apex seven simple short spines. 



Second maxillae margineci with setae (pi. 11, fig. 26). 



Maxillipedes (pi. 12, fig. 28) with the apical segment of the 

 larger ramus four times as long as broad at base, and much nar- 

 rowed at base. 



First gnathopods (pi. 12, fig. 29) with carpus slightly longer 

 and nearly one-third broader than the propodus; ischium and 

 merus each with a short transverse apical I'ow of long setae ; 

 carpus thickly fringed behind with setae considerably longer than 

 the daetvl, a fcAv isolated long setae in front and a short row of 



