100 THE ROYAL SOCIETY OF CANADA 



from other papers where specimens of species that have been reported 

 were not to hand. Much new material has been obtained since the 

 last paper was written and hence much new information was made 

 available, either concerning species already reported or species not 

 previously mentioned. Most of the new material has been procured 

 by shore collecting and dredging near the Biological Station, all of 

 this within a radius of 25 miles, and scarcely any of it from a depth 

 greater than 30 or 35 fathoms, hence there is room for much more 

 exploratory work even within this area. Through the kindness of 

 Professor Kincaid and his assistants, another large portion has been 

 obtained within a somewhat similar radius of the Friday Harbor 

 Station. Much of this was obtained personally during a stay of two 

 weeks at the Station in July and August, 1912. This was supple- 

 mented by specimens from the University of Washington, from an 

 assortment that represented several summers' collection at the Friday 

 Harbor Station. It was possible to examine a great deal of this in a 

 short time at the University since a fine lot of specimens, covering a 

 majority of the species, had been sorted out by Mr. H. Osterud. 



For the remainder of the material I am indebted to Dr. J. P. 

 McMurrich, who collected some excellent specimens on one trip 

 north to Prince Rupert, Fort Simpson and Queen Charlotte Islands, 

 and on another trip around Vancouver Island, in which dredging was 

 i lone at various depths, all in rather shallow water. 



The area from which the new material has been obtained is 

 practically the same as that on which a report has already been 

 given but the additional collecting has brought to light 28 species 

 new to this region, 18 of which are new to the coast and 7 arc described 

 as new to science, besides which the gonosomes of 6 others have been 

 found for the first time. The total number described in this paper as 

 occurring in this region is 136. 



Not only does the hydroid fauna show variety, but the abundance 

 of many of the species, eg. Lafœa dwnosa, Lafœa gracillima, Sertularella 

 tricuspidata, Abietinaria abietina, Abietinaria traski, Calycella syringa, 

 Clytia edwardsi and Obelia longissima, is very noticeable. Variety 

 and abundance are often marked at the same time when conditions 

 are especially favorable. Northumberland Channel at the entrance 

 to Dodds Narrows has been mentioned already as a place where 

 conditions are favorable. The truth of this has been further ac- 

 centuated as in a single haul with a two-foot hand dredge, made in 

 this locality on May 17, 1912, 36 species of hydroids were obtained. 

 Although^ this is a record, it is scarcely an isolated case as it is quite 

 a common occurrence to get upwards of 20 species in a couple of hours' 

 dredging. In one instance while dredging in Cabriola Pass a decorat- 



