NYCTIPHAXES SIMPLEX. 289 



ferous, while the endopod is minute aiul naked. The three posterior pains 

 somewhat shorter than the second pair; the exopod well defined, as long as the 

 stalk and without terminal setae. — Sixth abdominal segment somewhat longer 

 than the fifth and rather thick. — The uropods reach a little beyond the middle 

 of telson. — The telson (fig. 3c) is a little broader near the end than at the base. 

 The terminal margin (fig. 3d) transverse, straight, with se\-en spines, which 

 increase somewhat in length from the median spine outwards and ha\-e the 

 proximal major part at each side furnislied with minute denticles; the inter- 

 mediate pair of postero-lateral spines slightly longer and a litth^ less thick than 

 the inner pair, which is more than twice as long as the outer terminal spine; 

 the outer postero-lateral spine less than half as long as the intermediate pair. 



Length of the specimen described 3.2 mm. 



Last FurciUa-Stagc (figs. 3e-3f). — Carapace with frontal i)late almost 

 as in the preceding stage. — Antennulae considerably longer, but the ]irocess 

 from the first joint is still as long as in the stage descriljed, while the flagella 

 arc al)out as long as the sum of the two distal peduncular joints, setiferous at 

 the end but with articulations very indistinct; the lower flagellum is a little 

 longer and considerably thicker than the upper. — Antennae still as in the 

 intermediate stage. — The endopod of the maxillipeds somewhat longer and 

 thicker than the exopod, with a few feeble articulations. — First pair of thoracic 

 legs considerably developed; the endopod reaches the base of the antennae, 

 is distally setiferous and with the final numlier of joints; the exopod still un- 

 jointed and without setae; the gill with two long Ijranches and one very short 

 branch. — Second pair somewhat less de\'eloped than the first, as the endopod 

 is somewhat shorter, but yet with the end setose and the full number of joints, 

 while the gill-branches are a little shorter than in first legs. — Third pair of legs 

 less than half as long as second pair but with the gill cjuite simihu-; the two next 

 pairs of legs are small rudiments. 



The three anterior pairs of pleopods have the endopod almost half as long 

 as the exopod and distally setiferous; in the two posterior jiairs the exoi)od is 

 well developed, setiferous, while the endojiod is small and naked. —Sixth ab- 

 dominal segment as usually conspicuously longer than in the intermediate stage; 

 its uropods reach somewhat beyond the middle of the telson (fig. 3e). — The 

 telson (figs. 3e and 3f) is a little more than four times as long as broail and 

 slightly broader at the base than somewhat before the end; the terminal margin 

 is a good deal shorter than in the preceding stage, but still with the sexcn spines, 

 which are even somewhat smaller than before; among the postero-lateral spines 



