ERRATA. 



Page 35, line 9 from top, for Carry fork read Cany fork. 



Page 48, line 15 from top, for 1837 read 1836. 



Page i9, line 17 from top, for is read in. 



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



Pag-e 59, line 17 /roTO bottom, for forms read performs. 



Page 96, line 8 from top, for Pepinianus read Pepiniana. 



Page 131, lined from top, for membranacea read membranaceus . 



Page 140, line 7 from bottom, dele obovate, and place angulata under crassa 



Page 422, line 3 from bottom, for Tessut read Tessier. 



