98 THÉEL, NORTHERN AND ARCTIC INVERTEBRATES. I. SIPUNCULIDS. 
close to the commencement of the proboscis'". Their Fig. 14, too, is misleading. 
SELENKA seems to have accepted their views. In fact, the anus is removed far 
away from its ordinary place to the anterior half of the proboscis (Figs. 154—155 
and 184). 
Owing to the scantiness of my material I have not been able to make out 
whether a contractile vessel is present or not. 
