DAPHNIAMJ. 
75 
smaller than the three succeeding pairs, and is the most 
simple of construction. It is situated immediately be- 
hind the mouth, being inserted into the body of the 
animal by the basal joint, which is broad and somewhat 
fleshy. Attached to it is another joint of a triangular 
shape, and having on its outer edge three small projec- 
tions, each furnished with four or five long and strong 
setae (analogous to the branchial plate of the succeeding 
pairs). At the extremity of this joint is another very 
small one, which is also furnished with one or two long 
setae. All these setae are jointed at about the middle of 
their length, and are not plumose. 
The second pair (t. VIII, f. f) is larger than the first, 
and is inserted into the body a little behind it. It con- 
sists of four articulations ; the basal broad, the second 
somewhat quadrilateral and flatter, with three projections 
at one extremity, the two internal sending off each one 
long plumose seta, and the external sending off three, 
equally plumose. On each side of this second joint there 
is situate another, one slightly quadrilateral, and sending 
off from its external edge fifteen long setae, all jointed, 
the external being much the longest and finely plumose ; 
the other narrower and oblong, and furnished at its 
extremity with two plumose setae. The larger of these 
two may be considered as a branchial plate. In the 
third pair (t. VIII, f. g), the second joint is longer than 
that of the preceding pair, and sends off from its inferior 
extremity two short simple setae. The branchial plate is 
attached to its external face, is larger and longer than in 
the preceding pair, and has numerous filaments on its 
free edge (Straus reckons seventy-six). The fourth arti- 
culation is larger than that of the preceding pair, is broad 
and nearly quadrilateral, and sends off six long plumose 
setse, four from the inferior edge, and two from its 
internal side. The fourth pair (t. VIII, f. h) is similar to 
the third. The branchial plate has fewer filaments 
(Straus reckoning only sixty-five), and the fourth articula- 
tion is more oblong, and larger. The fifth pair (t. VIII, f. i) 
