Partial List of the Animals Yielding Embryological Material 

 at the Puget Sound Biological Station 



J. F. BOVARD 



University of Oregon, Eugene 

 and 



H. L. OSTERUD 



University of Washington, Seattle 



The following record is compiled from the casual observations made 

 in the conduct of a class in invertebrate embryology at the Puget Sound 

 Biological Station during the summer sessions of 1917 and 1918. Complete 

 data on the seasons of reproduction and on the breeding habits of the 

 common marine forms in the vicinity of Friday Harbor would be most de- 

 sirable and useful, but cannot yet be realized. 



This record pretends merely to list the animals that undergo a part 

 or all of their phases of reproduction during the time from late June to 

 early in August; and although it is not a complete list it is hoped that it 

 may serve as a partial guide to those interested in embryological material 

 for classes and for research. 



The record is arranged by phyla, giving the animals known to be 

 either laying eggs, or having just passed this stage, during the time the 

 Station was in session. It is intended to state whether the forms are 

 abundant, common, or occasional; and also whether or not they may be 

 found during the entire session. While the list is for the most part in- 

 vertebrate, one or two vertebrate forms are included on account of the 

 excellence of certain material. 



That successive seasons vary considerably in the nature and abund- 

 ance of available embryological material is certain; and a record of even a 

 few forms over a number of years would help establish a norm from 

 which a certain expectancy might be anticipated. From the experience 

 of each season as the session closes (1917 and 1918), it becomes more 

 certain that the list of reproducing forms may be very considerably ex- 

 tended. Prof. C. M. Child, Dr. H. B. Torrey, Dr. H. S. Brode, Dr. J. W. 

 MacArthur, Dr. Nathan Fasten, and Mr. M. C. Riddle have called atten- 

 tion to numerous facts which are included ; and of their generous interest 

 acknowledgment is gratefully made. Specially are we indebted to Prof. 

 Trevor Kincaid, who gave many suggestions out of his long experience in 

 collecting in Puget Sound waters. 



While the Biological Station happens to be in session when it is most 

 favorable for investigators to get away from college duties, it does not 

 coincide with the time when most of the animal life is at the height of its 



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