The following paper on the Hydroids of the Expedition, by Pro- 

 fessor C. C. Nutting, of the University of Iowa, was originally pub- 

 lished in the Proceedings of the Washington Academy of Sciences, 

 vol. Ill, pp. 157-216, May 11, 1901. It is here reprinted from the 

 same electrotype plates, so that it may be quoted exactly as if it were the 

 original. The original pagination has been preserved and transferred 

 to the inner or hinge side of the page, where it is enclosed in brackets, 

 thus [159]; while the consecutive pagination of the present volume 

 has been added in the usual place. In the plates the original number 

 and running headline, slightly abbreviated, have been preserved [in 

 brackets], while the volume designation and serial plate number have 

 been added in the usual place. The original text references to the 

 plates are unchanged. The present headpiece and title have been sub- 

 stituted for the running heading of the Academy's Proceedings and 

 the original title, which was : Papers fro7n the Harriman Alaska 

 Expedition. XXI. The Hydroids. No other alterations have 

 been made. Editor. 



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