I. '08. 26 



length of the fifth and is provided with a minute posterior 

 dorsal spine. The telson reaches to about half the length of 

 the outer uropod ; it is sulcate above, with a pair of prominent 

 dorso-lateral carinae, and terminates acutely. The inferior 

 margins are finely setose. 



The eyes (fig. 12) are about two -fifths the length of the an- 

 tennal scale; viewed from above, the cornea, which is much 

 wider than the peduncle, extends over more than half the 

 length of the whole organ. 



The antennular peduncle (fig. 12) is about one and a quarter 

 times the length of the antenna! scale. The wide basal joint 

 is one and a half times the length of the ultimate segment. 

 Its inner and outer margins are turned upwards at the base ; 

 between them is a deep cavity which extends forwards and 

 serves for the reception of the eye ; an obscure notch on the 

 outer edge represents the lateral process. Both second and 

 third joints are very stout, the latter being about twice as long 

 as wide. Of the flagella, the secondary or low^er ramus of 

 the male (fig. 3) bears a single-jointed appendix, tipped with 

 setae, on the basal segment. The second segment is inter- 

 nally concave and provided wdth stiff setae and a cluster of 

 strong spines ; the third is convex and swollen , and under a 

 high power is seen to be covered with very numerous fine 

 transverse ridges. The stouter upper flagella and the lower 

 rami of the female are broken off in all the specimens 

 examined. 



The antennal scale (fig. 12) is approximately half the length 

 of the carapace and is rather more than two and a half times 

 as long as wide. The outer margin is convex and terminates 

 in a small acute spine which scarcely surpasses the broadly- 

 rounded end of the lamellar portion. The flagella are very 

 long and show the curious kink or bend which Kishinouye 

 (1905, figs. 1 and 2) has described in Acetes japonicus (see 

 inset to fig. 1).^ The fringe of setae (two to each segment), 

 which exists on the proximal part of the flagellum, stops 

 abruptly at this bend, beyond which the segmental divisions 

 are oblique instead of transverse. 



The mandibles (fig. 9) are provided with a long two- jointed 

 palp, which is densely setose ; the basal joint is rather less 

 than two and a half times the length of the ultimate. The 

 forms of the maxillae and first two maxillipedes are shown in 

 figs. 5-8, and do not call for detailed description. 



The third maxillipedes reach beyond the tips of the anten- 

 nular peduncle, but are nevertheless considerably shorter than 

 the third pair of pereiopods. The four proximal joints are not 

 thicker or coarser than those of the third pair of pereiopods. 

 The ultimate and penultimate segments are setose along both 

 margins, the former (fig. 4) being sub-divided into five joints, 



1 Bouvier (1908) has observed a similar bend in the antennae 



ol Gennadas and Amalopenaeufi. 



2 The podobranch at the base of the second maxillipede is omitted in 

 fig. 6. 



