12 WEST AMERICAN SHELLS 
Platidea aneminoides, Sacchi, the Little Lamp- 
shell, is not much larger than the head of a good 
sized pin. It is quite flat, without distinct sculp- 
ture, circular in outline, ight brown in color, but 
has the distinctive hole in one valve. My speci- 
mens came from San Pedro Bay, and lived under 
600 feet of water. It is also found in the Mediter- 
ranean Sea and other parts of the world. 
We have in Figure 3 two 
views of another brachiopod, 
Terebratahia occidentalis, 
Dall, the Western Lamp- 
shell. he figure is of the 
natural size, as is indieated 
by the fraction. This sheli 
is not a common one, but is 
reported from Monterey 
southward. The valves are 
white, with ribs of carmine. 
Terebrataia transvérsa, 
by., the Red Lamp-shell, 
SE (3) (Waldheimia grayi), is well 
shown in igure 4. It is by far the most common 
species of these shells on ° 
our coast, and attains its 
highest development in 
Puget Sound, where it 
sometimes grows much 
larger than the picture. 
On the east side of Van- 
eouver Island it is re- 
ported ‘‘to be found in 
thousands, attached to the Fig. 4,x 3(*) 
