94 WEST AMERICAN SHELLS 
Siliqua lucida, Conr., the Bright Razor-shell, lives 
from Monterey to San Diego, and, according to Dr. 
Dall, it was confounded by Carpenter with the 
young of S. nuttallii. The shell is small, fragile, 
and has a short, narrow, and nearly perpendicular 
rib, or callus. 
Solen sicarws, 
Gld., the Blunt 
Razor-shell, 
shown in Figure 
Sos 1S Sho wate 
shghtly curved, 
and truncated in 
front as if it had been chopped square off. White, 
with a glossy, yellowish epidermis. This species 
ranges from Vancouver Island to San Pedro, Cal. 
Solen rosaceus, Cpr., the Rosy Razor-shell, lives 
only in the south. It is two inches long and less 
than half an inch wide, and resembles a small, 
flattened tube. The shell is straight, rosy white 
in color, and is covered with a glossy, horn-colored 
epidermis. 
Ensis californicus, Dall, the California Razor- 
shell, is a rare shell, found from Monterey south- 
ward. It is delicate, slender, and curved. 
The members of the Mactride, which we are 
now to consider, may be distinguished by the tri- 
angular pit for the cartilage, which is situated 
in the midst of the hinge-teeth. The shells are 
mostly quite thin, with sharp edges, and they are 
often partly or wholly covered with a thin epi- 
dermis. 
