CHAMA, CARDIUM AND VENUS 71 
Chione fluctifraga, Sby., the Smooth Chione, is 
about the size of the others. There is no distinct 
lunule, as in the other kinds, and the rib sculpture 
in the middle of the disk becomes fainter with age, 
till it sometimes almost disappears near the edge 
of the shell. Internally the valves are more or 
less purple. All three of these species have strong, 
heavy shells, which are marked by fine internal 
teeth around the edges. Farther to the south there 
are many other species. 
Vénus kennicottu, Dall, Kennicott’s Venus, is 
a very rare shell found at Neah Bay, Washington, 
and off the coast of central Cal. It is finely and 
closely lamellose over the whole surface. It some- 
what resembles the common V. mercenaria of the 
Atlantic coast. Length, two and a half inches. 
Fig. 57 (*) 
Figure 57 represents a fine, large shell, taken 
alive at Sitka. A worn valve was found many 
years ago at Carmel Bay, near Monterey. Its 
