ERRATA. 



Page 32, 14 lines from bottom, /or " bastoderm," read "blastoderm. 

 ,, 95,19 ,, ,, ,, „ "next year," „ "same year.'' 



,,111,35 „ „ „ „ "beaked," „ "backed." 



,, 125,28 ,, ,, top, „ "diseases," ,, "decreases." 



,,183,20 „ „ bottom,,, "o," „ "of." 



