318 ANNELIDA FROM BERMUDA. 



Buccal segment as long as the four following segments together; 

 second segment short, not well defined above; tentacular cirri about 

 one half the length of tlie buccal segment. 



Number of segments, 107. 



Length, 40"^'". 



Greatest width, 4'"'". 



Eunice longicirrata w. sp. 



(Plate XII, Figs. 75-SO.) 



Head distinctly four-lobed ; upper lobes narrow, but somewhat elon- 

 gated. Median antennae 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 the}- again gain in 

 diameter and length, but are never so large as on the anterior segments. 



The branchige begin as a single "filament on the third setigerous seg- 

 ment (Fig. 7G) ; on the next segment they have G 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, exevy way similar to 

 the antenn.T?. 



The bidentate seta^. 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 bidentate acicula (Fig. 80) appears, in the lower part of the foot, 

 followed quickly by another of the same kind. Delicate setse penetrate 

 the base of the dorsal cirri. 



