NYCTIPHANES SIMPLEX. 289 
ferous, while the endopod is minute and naked. The three posterior pairs 
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 seven spines, which 
increase somewhat in length from the median spine outwards and have the 
proximal major part at each side furnished with minute denticles; the inter- 
mediate pair of postero-lateral spines slightly longer and a little 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 Furcilia-Stage (figs. 3e-3f)—Carapace with frontal plate almost 
as in the preceding stage.— Antennulae considerably longer, but the process 
from the first joint is still as long as in the stage described, while the flagella 
are about 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 number of joints; the exopod still un- 
jointed and without setae; the gill with two long branches and one very short 
branch.— Second pair somewhat less developed 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 quite similar; 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 pairs the exopod is 
well developed, setiferous, while the endopod 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 broad 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 seven spines, 
which are even somewhat smaller than before; among the postero-lateral spines 
