ERRATA, 



Page 61, 15tli line from bottom, for "D. gracillia" read "D. gracilis." 



Page 71, 9th line from bottom, for "exirvse" read "exuviae." 



Page 81, 10th line from top, for "Strophodus tanuis" read "Strophodus tenuis."' 



Page 114, 4th line from bottom, for "spacieB" read "species." 



Page 124, 17th lino, from bottom, for "stringent" read "strongest." 



Page 126, 10th line from bottom, for "Ctenocanthus" read "Ctenacanthus." 



Page 131, 6th line from top, for "Ch. lorifornwis" read "Ch. Ioriformis." 



Page 135, 3tl line from bottom of note, for "above the middle" read "near base of Coal Measures. " r 



Page 137, 11th and 14th lines from top, for "Opisthocaelian" read "Opisthoccelian." 



Page 138, 2d line from top, for "Borborocastes" read "Borborocoetes." 



Page 146, 12th line from bottom, for "Gonialite" read "Goniatite." 



Page 150, 1st line at bottom, for "species" read "specimens ;" also, 18th Hue from bottom, as well as 5th line 



from top, of p. 165, for "paloeontologists" read "palaeontologists." 

 Page 152, 3d line from bottom, for "graulose" read "granulose ;" and 12th line from top, for "hexigonal" read 



"hexagonal." 

 Page 153, 15th line from bottom, for "Rynehonella" read "Kliynclionella." 

 Page 160, 6th line from top, for "1810" read "1808 ;" and 7th line,.for "II, p. 174," read "I, p. 50." 

 Page 167, 4th line from top, for "Miller" read "Munster." 

 Page 191, 5th line from top, strike out "the" after "Batocrinus ;" and 14th line from bottom, for "Prelim" read' 



"Berlin." 

 Page 202, 8th line from bottom, for "abconical" read "obconical." 

 Page 218, 9th line from top, for "supraradials 3 or 4 x 10" read "supraradials 2 x 10 ;" and 2d line from below, 



for "over the.interradial and anal spaces" read "over the axillary spaces." 

 Page 240, 1st line at top, insert "is" before "like Scaphiocrinus simplex j" 2d line, insert "but" before "differs." 

 Page 263, insert "Dichocrinus constrictus, M. and W.," between the 9th and 10th lines from top. 

 Page 272, 9th line from bottom, strike out the "?" after "Body." 



Page 280, 13th line from top, for "1814" read "1812 ;" and 14th line, for "tab. 68" read "I, p. 53," 

 Page 299, 4th line from top, for "Dorsal valve" read "Ventral valve." 

 Page 364, 8th line from top, for "shell smoother" read "shell smooth." 

 Page 396, 11th line from top, for "sim- eyes" read "simple eyes." 

 Page 415, 13thandl5th lines from top, for "Saganella" read "Sagenella." 

 Explanations of PI. X, 4th line from top, for "angustas" read "angustus." . 



N. B.— A few errors and omissions in the references in the text, to particular figures on some of the plates, 

 are corrected by the explanations of the plates. 



