338 
Phyllodocidæ 
Notophyllum foliosum M. Sars. 
“Dana“ St. 3045, one specimen. 
On the only specimen present it appears by doser examination 
that the nuchal organ consists of two rather long and siender flabs, 
each distally somewhat expanded and ending in two short branches, 
and thus somewhat differing from the common apprehension of the 
shape of this organ in the species under consideration. Thus Berg- 
strøm (9) in his compendious paper dealing with the systematism of 
Phyllodocids simply writes that the nuchal organ “ungeteilt ist“. 
Fig. 1. NoiophijUum foliosum M. Sars. The cephalic lobe and first segments of the 
specimen taken by the “Dana“. — Fig. 2. Notophyllum foliosum M. Sars. The cephalic 
lobe and first segments of a specimen originating from the Fjord of Trondhjem. 
I therefore believed that I had to do with a new species until I 
found that Marenzeller in his paper ‘‘Polychseten des Grundes” 
(62) has figured the head with protruded nuchal flabs of a specimen 
of Notophyllum foliosum, very much like that found in the specimen 
taken by the “Dana”, only more extreme in shape, the organ 
being more distinctly divided into two branches. In the text Maren¬ 
zeller remarks that ”eine solche Verdoppelung scheint nicht ver- 
einzelt aufzutreten, da ich ihre ersten Anfange ebenso an einem 
Tiere aus dem atlantischen Ocean beobachtete.” After having read 
this I undertook an examination of all the specimens present in 
our museum of the species under consideration, including several I 
Danish specimens as well as Norwegian, and found that not few | 
of them had branched nuchal organs and that the named organ ^ 
was varying rather considerably as to shape and size. The most 
