Coralliochama orcutti White, 1885, height (incomplete) 12.7 cm, width 7.7 cm
As shown above, the lower valve (right valve) of a rudistid belonging to genus Coralliochama has the form of an elongate thick-walled cone. The upper valve (left valve) is reduced to a domed structure. The commissure is the line of junction of the two valves.
The following picture is of the same specimen as above but shows the front of the bivalve. This specimen is of Late Cretaceous age (approximately 72 million years old) and is from northwestern Baja California.