V. -SPECIAL RULLETIX OF THE U. S. XATIOXAL MUSED 



IV. Smithsonian Institution. | United States National Mnseimi. 



I — I Special Bulletin, j | American Hydroids. 



I I Part II. I The Seitularida\ \ With forty-one plates. 



I By j Charles Cleveland Nutting-. | Professor of Zoology, Uni- 

 versity of Iowa, j I Washington: | Government Printing 



Office. I 1904:. 



4vo., pp. ii, l-oiio. 41 pis., 139 figs. 



25 



