Errata.

Page 49, in Foot-note, for “170,000” read “189,000.”

" 101, line 23, for “sepals, 4 valvate” read “sepals 4, valvate.”

" 107, 39, change parenthesis from before “Eleogeton,” to commencement of line.

" 145, 31, for “unitica” read “mutica.”

" 164, in Foot-note, for “scientific” read “specific.”

" 165, line 7, for “extinct” read “recent.”

" 167, 21, for “Turritella” read “Tornatella.”

" 222, 48, for “our” read “one.”

" 285, 30, for “instructive” read “instinctive.”

" 289, 29, for “quarrel” read “general.”

" 371, 53, after “rocks,” for full-stop insert a comma.

" 388, 50, for “white-crested” read “white-breasted.”