ERRATA. 



Page 392, line 13 from bottom, for "PI. XXVII" read "PI. 

 XXVI." 



Page 394, line 2 from top, for " PI. XXVII " read " PI. XXVI." 



Explanation of Plate XXVII, figs. 13 and 14 refer to Plate 

 XXVI. 



Plate XXVII, for the figures numbered " i, 2, 3, 4, 5, 6, 7, 8, 9, 

 10 " read " 15, 16, 17, 18, 19, 20, 21, 22, 23, 24" respectively. 



