THYSANOPODA SP. 285 
setae; outer ramus much shorter than the inner.— The mazxillipeds (fig. 1a, 
mxp.) with the exopod longer than the endopod.— First pair of thoracic legs 
are only short, simple protuberances, and no distinct vestige of following pairs 
is observed. 
The abdomen (fig. la) with the upper part of second segment distinctly 
elongate and dorsally a little protruding towards the hind margin; sixth segment 
as long as the sum of the two preceding segments and somewhat longer than 
deep.— First pair of pleopods shaped as a very oblong, naked joint; the follow- 
‘ 
ing pleopods visible only as low knots covered by the ‘‘epimera.’’— The uro- 
pods (fig. 1c) reach conspicuously beyond the middle of the telson Telson 
almost two and a half times as long as sixth segment, scarcely three and a half 
times as long as broad and narrower somewhat from the end than at the base; 
its end (fig. 1d) with seven moderately short, distally very slender spines, and at 
each side near the end three spines, the distal long and very strong with fine 
spines along more than the proximal half of its inner margin, the intermediate 
spine a little less strong but still somewhat longer than the distal and showing 
similar armature; the proximal spine strong but only one third as long as the 
next. 
Length 3.7 mm. 
The two specimens described are from ‘‘ Albatross” Sta. 4635, November 4, 
1904; surface. A third specimen from the same Station is intermediate between 
the first and the last Furcilia-stage. 
B. Last Furcilia-Stage (figs. le-1g)— The frontal plate (fig. 1f) a little 
shorter and somewhat broader than in the first Furcilia-stage; the dorsal keel 
is smaller and situated nearer to the base of the frontal plate than to the pos- 
terior margin of the carapace (fig. le)— The antennulae are somewhat longer 
(fig. 1f); the process from first joint reaches the middle of the third joint; the 
second joint nearly longer than broad; the lower flagellum as long as the third 
peduncular joint and somewhat longer than the upper flagellum. The antennae 
and the maxillipeds essentially as in the preceding stage.— The first pair of 
thoracic legs not longer than the maxillipeds, with the endopod divided into 
some joints, the exopod very short and two branchial filaments; second pair 
nearly rudimentary with a four-branched gill; third pair rudimentary with a 
small three-branched gill. 
Second abdominal segment protrudes as in the preceding stage; sixth 
segment more than half as long again as deep.— First pair of pleopods with both 
rami present and setiferous but the endopod is very short; second pair a little 
