70 WEST AMERICAN “SHELES 
pure white inside, and almost glossy, while exter- 
nally they were comparatively smooth and quite 
chalky. This shell has been confounded with S. 
squalidus, but that is a South American species. 
The Oregon Saxidomes which are sold in the 
markets of Portland belong to S. giganteus. 
There are three species of 
Chione upon the coast, which 
have received, however, sever- 
al times three names. Figure 
‘D6 gives an end view of Chione 
succincta, Val., the Banded 
Chione. The cordate lunule is 
a prominent mark, while on the 
other side of the beaks is the 
long and deep eseutcheon. Nu- 
merous ribs radiate out from 
the umbo, but those in the middle generally become 
flattened towards the edge of the shell. The con- 
centric ridges, as shown in the picture, run around 
the shell somewhat like hoops around a barrel. 
The interior is white, while the outside is a dingy 
yellow. 
Chione undatélla, Sby., the Wavy Chione, (C. 
simillima), is a species which varies considerably, 
but can usually be told readily by the great num- 
ber of concentric lamelle, which are closer to- 
gether as they come nearer the edge of the shell, 
almost completely concealing the ribs. The valves 
are inflated, thick, and heavy. Sometimes the 
interior is purple around the palhal sinus. These 
shells, which are seldom over two inches long, 
are found abundantly in southern California. 
Fig. 56 
