OTHER BIVALVE MOLLUSKS 85 
the whole genus. The general form of the shell is 
oval, but the posterior end is suddenly contracted. 
Thin and glossy, with some epidermis around the 
edges. Pallial sinus large, ligament strong and 
broad, making a conspicuous external feature. 
Macoma indentata, Cpr., the Indented Macoma, 
is a southern shell resembling a small specimen 
of the last species, but the lowest edge of the shell, 
near the posterior end is indented and beaked. 
A very pretty shell found far to the south is 
named Metis alta, Conr., the Yellow Metis, (Lutri- 
eola alta). The shell is round oval, wrinkled at 
the siphon end, and marked with fine but distinct 
concentric lines. Ligament area depressed. Whit- 
ish or brownish externally; inside glossy white, 
suffused with a bright yellow flush in fresh speci- 
mens. Length about two inches. 
While the last shell was very pretty we now have 
one that far exceeds it in beauty, namely, Sémele 
