158 TRANSACTIONS OF THE [FEB. 8, 



An interesting fact was noted in connection with the eccentricity 

 of this form. Of a large number of individuals taken from their 

 natural position in the sand, fully 80 per cent, had the pointed 

 side directed vertically or obliquely down. This is doubtless 

 the burrowing edge, while the thicker end including the arms 

 and most of the ambulacral plates lies nearest the surface of the 

 sand and will be grasped first by the thumb and fingers in col- 

 lecting. The adaptation to a burrowing habit is thus correlated 

 with the radial as^-mmetry. 



Scow Ba}^ is a comparativelj'^ shallow inlet shut off from the 

 eastern side of .Port Townsend Harbor by a narrow spit leaving 

 a communicating channel of but little width through which the 

 tide runs in and out, with considerable velocity. It was origi- 

 nally a channel cutting off Marrowstone Island from the mainland, 

 but the glacial drift has been washed westward so that a long spit, 

 some miles in length shuts it off from Port Townsend Harbor. 

 Numerous specimens of Asterias were taken along the inner 

 shore of this spit. They were not infrequently accompanied by 

 the curious Ophiodromus, an annelid that lives between the 

 arms of the starfish and is colored so as to resemble the surface 

 of the latter. Across the channel and covered by shallow water, 

 the bottom was blackened by innumerable Dendrasters. 



The File Faima. 



Large numbers of the common mussel {Mytilus edulis) oc- 

 cur, often clustered in dense crowns encircling the upper, part 

 of the pile just below high water-mark. Below their place is 

 taken by numerous barnacles and compound ascidians, with 

 an occasional chiton {Mopalia 01110101) or one of the smaller 

 actinians in their midst. These occur on both surfaces of the 

 loosely adhering bark, while numerous sea stars and a small 

 white Gucumaria find shelter beneath it. The bark is also a 

 favorite resort for the Turbellarian previously mentioned which 

 lays its eggs in patches among the barnacles, while the ruffle 

 like egg masses of the small Doris are likewise deposited here. 

 Nemertines (CarHnella, Enopla) and Isopods (Lygia, Idotea) 

 were likewise found in quantity among the barnacles and in 

 various nooks and crevices of both pile and bark. The body of 

 the pile is frequentl}^ honeycombed by borings of a large Teredo 

 of which a few maturation stages were obtained in July. 



Among the annelids on the piles one finds Spirographis most 

 frequentl3^ In this habitat the worm attains much larger size 

 than when it lives on the bottom, some of the large leathery 

 tubes measurins: thirtv inches in length and one inch in diame- 



