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Surface marked by densely crowded and exceedingly minute, 
irregular and rarely continuous, but on the whole radiating, simple or 
bifurcating raised lines, also by comparatively large, regularly disposed 
and distant squamose radii. In the centre of each valve the minute 
and non-squamose raised lines are essentially parallel to the larger 
squamose radii, but on the sides the former are disposed obliquely to 
the latter. The surface of the anterior ear of each valve is minutely 
cancellated with extremely minute raised lines, which are almost parallel 
to the hinge line, in addition to the coarser cross lines. The whole 
sculpture of the exterior of the test is far too minute to be clearly seen 
without the aid of a microscope or powerful simple lens, but under 
either of these a few faint concentric lines of growth are also visible. 
Dimensions of the only specimen that the writer has seen : height, 
from beaks to base, 7.50 mm.; maximum length, 7.75 mm.; greatest 
thickness through the closed valves, 2.25 mm. 
Forward Inlet, Quatsino Sound, Vancouver Island, in ten to twenty 
fathoms mud, Dr. G. M. Dawson, 18.85 : one living 'Specimen. 
In the list of specimens collected by 1 )r. Dawson in that 
year, the little shell upon which the foregoing description is based, 
was erroneously identified with the Peel en Alaskensis of Dall. 
A subsequent study of its characters, has led to the conclusion 
that it is much more nearly related to Pecten vitreus, Chemnitz, 
and P. abyssotum, Loven, from both of which it can be 
readily recognized by its very peculiar sculpture. P. Alaskensis has 
opaque and much thicker valves and different surface markings. Its 
posterior auricles are distinctly defined and its anterior auricles very 
much smaller in proportion to the size of the shell, than those of P. 
Vancouverensis. The credit of first distinguishing between the species 
last named and P. Alaskensis is due to the Rev. G. W. Taylor, of 
Victoria, V.I., who informs the writer that he has two specimens in his 
collection dredged in about ten fathoms sand, Departure Hay, near 
Nanaimo, in 1888. 
Cardium (Fulvia) modestum, Adams and Reeve. 
The shell for which the name Cardium Richardsoni was proposed 
in the Canadian Naturalist for December, 1S78, was described as a new 
