ERRATA. 
Page 119. line 3, for MAiiDiE read Txachid.=e. 
Page 121, line 21, for "figs. 3, 3a" read "fig. 3" only. 
Page 12-1, line 7 from the bottom, for "forwards" read 
" upwards." 
Page 131, omit line 6 of explanation of Plate xxii. In 
line 2 of explanation of Plate xxiii., for "Enlarged" 
read " Inferior view of anterior rearions. Enlarged." 
