218 WEST AMERICAN SHELLS 
One-banded Chink-shell. It is a very little thing, 
about one-sixth of an inch in length, and consists 
of but few whorls. It is brown and glossy, with 
the color broken into dots on the keel of the body- 
whorl. The aperture is semi-lunar, and the flat- 
tened columella has a small umbilical fissure, from 
which circumstance it receives its name. It is 
worth looking for, and can often be found on sandy 
beaches. 
Lacuna porrécta, Cpr., the Wide Chink-shell, 
resembles the last figure, but is broader and more 
compact. The umbilical chink is large and the 
outer lip extended. It is found on kelp. 
Lacuna solidula, Lov., the Solid Chink-shell. 
This species is chiefly found in the north. It is 
large, having a shell nearly half an inch long. 
There are three or four whorls, smooth and strong. 
The umbilicus is small, and the color brown, with 
white columella. 
Lacina variegata, Cpr., the Striped Chink-shell. 
This species is tall, effuse, and has a wide chink. 
In color it is clouded or has zig-zag stripes. It 
lives on the coast of British Columbia, and may be 
found on the Zostera, or Hel-grass. 
Fossarus (Isapis) obtusus, the Obtuse Isapis, 
has a roundish little shell, a quarter of an inch 
long or less. The aperture is oval, and the outer 
lip is diversified by shallow, spiral grooves. The 
spire is small and few-whorled, and the color is 
hight brown. 
Fossarus (Isapis) fenestratus, Cpr., the Win- 
dowed Isapis, resembles the last species, but is 
