56 THEEL, NORTHERN AND ARCTIC INVERTEBRATES. I. SIPUNCULIDS. 
KOREN and DANIELSSEN are wrong, both with regard to the text and the figures. 
My conviction is, that there exists no difference between the two tentacle-erowns. 
Lastly, the two Norwegians insist on the two forms being distinet in another 
respect. Thus they write: "The two fascicular coeca, which are found in the Sipun- 
culus nudus quite in the wvicinity of the anus, we have not been able to discover 
in this species [SN. norvegicus|, and regarding S. priapuloides they add: "At the anal 
aperture there appear on the rectum 2 small gland-shaped organs . . .'< As far as 
my own investigations of S. priapuloides go, I have found that the rectum is attached 
to the body-wall by two muscular ligaments covered by a tissue resembling lobules 
of a gland, but I have not had at my disposal materials enough for detecting an 
efferent duct, nor for studying the cells which play the important part in the secre- 
tory process. I am fully convinced that the same problematical '""organs”, easily 
overlooked in the larger form, may also exist in the smaller one, though by reason 
of their insignificance they have escaped the notice of the investigators. 
Consequently my belief is that Sipunculus norvegicus is a young form of S. 
priapuloides, both forms having been dredged from nearly the same locality, and 
evidently living under the same conditions. 
If this supposition be right the species ought to be named Sipunculus norve- 
gicus DANIELSSEN on account of this name having the priority. 
