ERRATA. 
Page 19, for “VII,” before quaternary system, read “VIII.” 
Pages 39 and 48, for “ Pleurolomaria,” read “ Euomphakis.” 
Page 59, 13th line from top, for “amss,” read “mass.” 
Page 97, 12th line from top, for “ Plate 3,” read “ Plate 4 ” 
Page 107, 1st line, add “ Spirifer sinuatus,” before Silurian Researches. 
Page 113, for “41,” No. of woodcut, read “41 bis." 
Tage 117, 2d line from bottom, for “ one of the most important groups,” read “ the most important group. 1 
Page 118, 4th line from top, for “ Mackinaw,” read “ Mackinack.” 
Page 122, in explanation of woodcut, for “a a," read “b," and for “ b" read “a." 
Page 131, 13th line from top, for “ place,” read “plane.” 
Page 133, 16th line from bottom, for “geological,” read “sedimentary.” 
Page 158, 18th line from top, for “ specimen,” read “specimens.” 
Page 172, 16th line from top. for “2 a ,” read “G a." 
Page 175, 9th line from top, for “3,” read “4.” 
Page 189, 9th line from top, and page 190, 8th line from top, for “ Delthyrus mucronatus ,” read Dellliyris mucronala." 
Page 195, 8th line from bottom, for “ Dimyaira,” read “Dimyaria.” 
Page 200, in explanation of woodcut, for “ Loxonema sirwosa" read “ Loxonemanczilis,” See description of same, p. 201. 
Page 205, in explanation of woodcut, for “ Orthonata ,” read “ Orthonota .” 
Page 206, 10th line from bottom, for “pressed,” read “ perfect.” 
Page 212, illustration 190, the strata beneath the Tully limestone are incorrectly represented as horizontal, whereas they 
should follow the curve of the stratum above. 
Page 219, 13th line from bottom, for “ Seneca county,” read “ Seneca lake.” 
Page 224, reference to sections for “ PI. VII,” read “ PI. VI.” 
Page 257, 15th line, for “plain,” read “plane.” 
Page 280, 2d line from bottom in note, for “ right hand.” read “left hand.” 
Page 285, 10th line from bottom, for “ rock itself,” read “ rock in situ." 
Page 315, Catalogue of Mineral Springs, 4th column, 8th line, for “Cal. Mag.,” read “Sul. Mag.” 
Page 327, 14th line, for “ the accompanying plate,” read “Plate XIV.” 
Page 340, 13th line from bottom, after the word “thrown,” add “down.” 
Page 352, 10th line, after “ opposite,” add the word “side.” 
Page 406, 13th line from bottom, for “northward,” read “southward.” 
Page 481, 8th line, for “birdseye maple,” read “birdseye marble.” 
Page 503, 7th line, for “ the same as fossils at,” read “ the same fossils as at.” 
Page 509, 17th line, for “ were,” read “ are.” 
Page 509, in note, for Tenestella, read " Fenestella.” 
