ERRATA. 



In page 78, Prof. Duncan's description of Plate III. : fig. 4 should read 

 fig. 4, a, b, c; and fig. 5, a, b, c, should read fig. 5. 



In page 186, top line, for "incredible" read inevitable; and on line 15 

 from top, after " Australian! " discard the note of interrogation. 



