This photo shows the aperture. The shell has obviously been dead for awhile and has the remnants of a bryozoan growing within the aperture as well as some missing shell on the outer lip of the aperture. Note how the axial ribs disappear on the anterior half of the body whorl, while the finer spiral ridges are still visible.
Colus griseus shell collected dead from a red octopus (Octopus rubescens) midden. Shell height is 1.5 cm, width 0.7 cm. (Photo by: Dave Cowles, March 2008)
