133 
NOTES ON SOME MARINE INVERTEBRATA FROM THE 
COAST OF BRITISH COLUMBIA, i 
By J. F. Whiteaves. 
ECHINODEKMATA. 
Strongylocentrotus Franciscanus, A. Agassiz. 
This littoral species was recorded by the writer as having been 
collected by Mr. James Richardson in 1874 at Sooke, in the Strait of 
De Fuca. Dr. G. M. Dawson found it to be the common sea urchin 
of the Queen Charlotte and Vancouver islands, and especially abundant 
in localities exposed to the open sea, although its name was inadvertently 
omitted in the published lists of Echinoidea in his 1878 and 1885 
collections. Specimens of it were obtained at Qualicum, V. I., by 
Professor Macoun in 1S89. 
Mollusc a. 
Pelecypoda. 
Pecten (Pseudamusium) Vancouverensis. (Sp. nov.) 
Plate j, figs. 1 and 1 a 
Shell small, equivalved, compressed lenticular, both valves 
being equally convex, ovately subcircular in outline apart from 
the ears and rather oblique : valves extremely thin and fragile, translucent 
and almost transparent, pale horn colour with a slightly yellowish hue. 
Beaks placed a little behind the midlength ; hinge line straight and very 
long ; ears unequal in size, the posterior pair, which are much smaller 
than the anterior, alike, indistinctly defined and merging gradually and 
imperceptibly into the general convexity and marginal contour of that 
side of each valve ; anterior ears large, subtriangular, prolonged laterally 
and longer than high, distinctly defined, that of the left valve somewhat 
convex in outline above and concave below, that of the right valve with 
a deep and acutely angular byssal sinus at its base. 
I. Communicated by permission of the Director of the Geological Survey Department. 
