[TAYLOR] MARINE MOLLUSCA 49 
Vancouver Island by Dr. Forbes, and made the type of this species by 
Dr. Carpenter. 
The latter remarks, in his note on the species, that it ‘ may have 
been passed over as the young of Machera (Siliqua) patula, to which it 
bears a strong external resemblance.” 
No further specimens seem to have been found. 
TRESUS, Gray. 
103. Tresus NurrTazzi, Conrad. 
Lutraria Nuttalli, Conr., Journ. Acad. Nat. Sci. Phila., vol. vii., pt. 2, p. 255, 
pl. xviii., fig. 1 (1837). 
This is the clam of the North Pacific coast. It is very common on 
all our sandy beaches and is an important article of food among the 
Indians, who, in summer, collect and dry the animals for winter cou- 
sumption. A little crab, Pinnotheres faba, Dana, finds its lodging within 
the valves of this shell. 
THRACIA, Leach. 
104. THRACIA cuRTA, Conrad. 
Journ. Acad. Nat. Sci. Phila., vol. vii., pt. 2, p. 248, pl. xix., fig. 8 (1837). 
This shell has not yet been found in any numbers, though it seems 
to be widely distributed. 
Dr. Dawson took one specimen in Virago Sound, Queen Charlotte 
Islands, and a large single valve in Quatsino Sound, Dr, Newcombe 
has dredged it alive in Clayoquot Sound and at Comox, and I have 
dredged it alive at Departure Bay and have taken a few dead specimens 
near Victoria, A valve from the last named locality measured 57 x 
46 mm., being a little larger than the one from Quatsino Sound of 
which Mr. Whiteaves gives the measurements (Trans. R. S. Can. 1886, 
sec. iv., p. 123). 
105. THRACIA BERINGI, Dall, MS. 
This species has long been known to Dr. Dall, and though not yet 
described, I believe, has been distributed under the manuscript name 
T. Beringi. 
In 1888, I dredged a large single valve (58 x 43 mm.) and a small 
number of young living specimens of this species in Departure Bay. 
These were all submitted to Dr. Dall who kindly determined them for 
me as above. 
Sec. IV., 1895. 4. 
