318 ANNELIDA FROM BERMUDA. 
Buceal segment as long as the four following segments together; 
second segment short, not well defined above; tentacular cirri about 
one-half the length of the buccal segment. 
Number of segments, 107. 
Length, 40™™. 
Greatest width, 4™™. 
EUNICE LONGICIRRATA Nn. sp. 
(Plate XII, Figs. 75-80.) 
Head distinctly four-lobed; upper lobes narrow, but somewhat elon- 
gated. Median antenne reaching back to the eleventh segment; median 
lateral also long, reaching to about the eighth segment; lateral about 
one-half as long as the last. They are all very delicate, smooth. 
The buccal segment is as long as the next three segments. The 
second segment is nearly as long as the third, plainly set off from the 
first both above and below; its tentacular cirri are very delicate, 
acutely conical, reaching forward to the middle of the head. 
The dorsal cirri on the anterior segments are large and long (Figs. 
75-77), irregularly wrinkled ; they diminish in size very gradually back- 
ward to the middle of the body; behind the middle they again gain in 
diameter and length, but are never so large as on the anterior segments, 
The branchiz begin as a single filament on the third setigerous seg- 
ment (Fig. 76); on the next segment they have 6 subdivisions, on the 
next from 12 to 15. This number they retain to about the thirty-third 
segment; then for the next ten segments the filaments gradually become 
fewer; from about the forty-third to the fifty-third there is but one fila- 
ment; after this they disappear. The branchiated segments form about 
one-third the length of the body. 
The anal cirri are in two pairs; one quite short, blunt; the other as 
long as the last twelve segments taken together, every way similar to 
the antenne. 
The bidentate setz have the form shown in Fig. 79; the outer tooth 
is quite long, bluntly rounded at apex; the lower sharp, triangular. 
In the anterior segments there is one stout, projecting acicula, in the 
upper part of the foot; presently another is added; still further back 
a bi-dentate acicula (Fig. 80) appears, in the lower part of the foot, 
followed quickly by another of the same kind. Delicate sete penetrate 
the base of the dorsal cirri. 
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