igil] ASCIDIANS FROM THE COASTS OF CaNADA. II3 



Chelyosoma macleayanum, 



Caesira pannosa, 



Goniocarpa placenta. 



In addition to the above species, the following have been found or 

 are to be expected in this locality, but were not obtained in 1910: — 



Aplidium pallidum Verrill, 



Lissodinum aureum Verrill, 



Botrylloides aureum Sars, 



Pelonaia corrugata F. & G. 



The fauna is subarctic, consisting of species that are peculiarly 

 subarctic, most of which are closely related to, if not identical with, 

 European species, and other species that are found in both subarctic 

 and arctic regions or that have their nearest allies in arctic regions. 



(B). The Pacific Station. 



From June to August of both 1908 and 1909 were spent at the De- 

 parture Bay Station, and in the latter year three days were spent at 

 Ucluelet on the outer coast of Vancouver Island as the guest of Prof. 

 Macoun. 



At the station, the best collecting places at low tide are the preci- 

 pitous shores of the small rocky islands in the bay. The roofs of small 

 caverns, the under surfaces of projecting rocks and the under surfaces 

 of flat stones that are to be found on many of the rocky ledges are the 

 favourite spots. A considerable amount of dredging was done at vari- 

 ous depths ranging to about 25 fathoms. The curator of the station, 

 the Rev. G. W. Taylor, assisted me in every way and through his courtesy 

 I enjoyed several dredging trips to Northumberland Straits on the other 

 side of Nanaimo and one trip to Burrard Inlet near Vancouver. The 

 best dredging places were the channels, where the bottom was stony, 

 shelly or gravelly, although the sandy bottoms frequently yielded an 

 abundance of a few species. Much of the bottom gives poor results, 

 because of the absence of stones, &c. of a size that can be brought up by 

 the dredge, although these same bottoms are doubtless well populated 

 with Ascidians. 



Compound Ascidians. A species of Amaroucium occurs in quantity 

 at low tide and is occasionally dredged. A very dark Trididemnum with 

 few or occasionally no (?) spicules was taken several times in the dredge. 



Cionidae. Ciona intestinalis occurs rather frequently as shown by 

 the dredgings, but not in quantity. 



Phallusiidae. Ascidiopsis columbiana was growing in large num- 

 bers at low tide and was occasionally dredged. A. paratropa, a large 

 handsome species, occurs sparingly in 10 fathoms or more and 3 speci- 

 mens of A. nanaimoensis were found outside the bay and at Northumber- 



