vi Prepace. 



reported on bv Mr. James E. Benedict and Miss Mary J. 

 Rathbun. of the National Museum, who have kindly sent the 

 ■author the names of the species which he desired to mention: 

 and the Hydroida, a group for which the author is respon- 

 sible. The Echini and reef corals are probably identified 

 <:orrectly. It is hoped that there is an approximately correct 

 naming of the greater part of the Mollusca. Concerning 

 the remaining groups the identification of species can not 

 be relied upon to any great extent. Practically no attempt 

 has been made to discuss the worms, actinians and sponges. 



Species known to be new have not, with the exception of a 

 few hydroids, been described or figured. 



The author is greatly indebted to Mr. H. F. Wickham for 

 ■constant assistance during the preparation of this narrative, 

 and in the necessary drudgery involved in proof reading, a 

 task which has also been shared with Professor T. H. 

 McBride. 



To my father. Dr. Rufus Nutting, I am indebted for the 

 unusuallv complete index at the end of this volume. The 

 illustrations are from the excellent series of photographs 

 taken by Mr. Gilbert L. Houser. and the pen-drawings b}' 

 Miss Mar\- F. Linder speak for themselves. 



C. C. Nutting. 



State University of Iowa. 



