62 WEST AMERICAN SHELLS 
as far south as Monterey. The ribs on this species 
are close and flat, and the margin regular. A 
variety,comoxénse, Dall, is reported from the 
boulder clay of Vancouver I., that has the ribs so 
flattened that they are defined only by the inter- 
stitial lines. C. pseudofossile, Rve., and C. blan- 
dum, Gld., are included in C. califormense. 
Cardium ciliatum, O. Fabr., the Bearded Cockle, 
ranges through the boreal seas and descends to 
Cape Cod on the eastern, and to Puget Sound on 
the western coast. The shells are small and beard- 
ed. There are many varieties, which have received 
various names. 
Cardium biangulatum, Sby., the Angled Cockle, 
is a southern species, being found from the Santa 
Barbara Is. to Panama. It has a heavy shell, 40 
mm. high, with strong ribs. The interior is red- 
dish. 
Cardium elatum, Sby., the Giant Heart-shell, is 
the largest species of the genus, sometimes being 
fully six inches high. Its range is about the same 
as that of the last species. Yellowish externally, 
white inside, the ribs very slightly elevated. 
Cardium substriatum, Conr., the 
Kgeg-shell Cockle, (Liocardium 
substriatum), is another south- 
erner, very much smaller than the 
last, for Figure 48 represents a 
large specimen. Obscure ribs are 
generally visible, and the smooth 
shell is mottled, especially inside, 
with reddish brown splashes, like a sparrow’s egg. 
