No. 15. — Echinoderms from Puget Sound: Observations made 
on the Echinoderms collected bg the parties from Columbia 
University , in Puget Sound in 1896 and 1897. 
By Hubert Lyman Clark. 
Tiie collections of echinoderms made by parties from Columbia 
University in Puget Sound in 1896 and 1897 were placed in my 
hands for identification by the late Mr. N. R. Harrington. On 
account of the way in which the literature on the subject is scattered, 
and of the difficulty of securing specimens for comparison, I have 
had to ask the assistance of many zoologists; and I desire to express 
my thanks, for courtesies received in the preparation of this paper, 
to Dr. Bashford Dean, of Columbia University, Dr. H. P. Johnson, 
of the University of California, Dr. S. J. Holmes, of the University 
of Michigan, and especially to Professor Jacob Reighard, of Michi¬ 
gan. I am also greatly indebted to Professor G. IJ. Parker of Har¬ 
vard University and to the authorities of the Museum of Compar¬ 
ative Zoology at Cambridge for the opportunity of examining the 
collection of Asteroidea there; and to Mr. J. E. Benedict of the 
Smithsonian Institution for the privilege of making comparisons with 
the collections of echinoderms in Washington. Professor A. E. 
Yerrill of Yale has helped me greatly with the star-fishes, especially 
by sending me photographs of Dermasterias and Pteraster. 
Unfortunately, there are almost no data with the specimens in 
the collection, so that it is possible to give very few facts as to 
where or when the specimens were taken, or as to the depth of 
water, character of bottom, color in life, etc. Most of the speci¬ 
mens are labelled simply “ Puget Sound, 1896 ” (or 1897, as the 
case may be). In March, 1897, Mr. Harrington and Mr. B. B. 
Griffin published in the Transactions of the New York Academy of 
Science some “ Notes upon the Distribution and Habits of Some 
Puget Sound Invertebrates,” from which I have succeeded in 
getting a little information regarding the distribution of some of the 
forms given in the present list. From the fact that Messrs. Har¬ 
rington and Griffin mention seven holothurians and no less than 
five species of Asterias , it is clear that a considerable number of 
echinoderms were met with which are not represented in the collec- 
