ERRATA. 



Page 48, line 15 from top, for 1§37 read 1836. 



Page 49, line 17 from top, for is read in. 



Page 59, line 7 from top, for left valve read right valve. 



Page 59, line 17 from bottom, for forms read performs. 



Peige 96, line 8 from top, for Pepinianics read Pepiniana. 



Page 13] , line 9 from top, for Memhranacea read Membranaceus. 



