Rhynchonella plicatilis, [388], [391].
------------ subplicata, [388], [391].
Rhynchosaurus articeps, [712].
-------------, foot-prints of, [753].
Richardson, Mr. W., researches of, [791], [843].
Richmond, Virginia, [97].
------------------, diatomaceous earth at, [97].
Ridgway Hill, Dorset, [522], [557].
Riley, Dr., researches of, [713].
Ringinella, [426].