E R RATA. 
p. 19, line 16, for permited, read permitted. 
p. 25, line 2r, for Artomys, read Arctomys. 
p. 31, line 8, for duplicidentali, r'ead duplicidentati. 
p. 41, line 12, for the, read this. 
p. 56, line 31, for jet, read nearly. 
p. 82, line 10, for on, read an. 
p. 97, line 17, for egg, read eggs. 
p. 119, line 19, omit that. 
p. 151, line 9, for gingianus, read gin^inianus. 
