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ERRATA. 



Page 19, line 33, for " .98 " read " .08." 



Page 25, line 1, for "diameter" read "length." 



Pa^e 57, 2d line from top, for " cycle " read " series." 



Page 57, 15th line from bottom, for "pharynx" read "thorax." 



Pages 67 and 68, in six places, for " Mons." read " Prof." 



Page 70, left hand diagram, transpose the " W " to the right hand end of the diameter line. 



Page 75, 5th line from bottom, for " Della-Chiaje " read " Bojanus." 



Page 78, after the table, read, " Note. In regard to the change in the name of the carpal flexors and extensors, 

 see last paragraph on page 65." 



Page 93, line 17 from bottom, for " Athyris" read " MeristeUa." 



Page 99, line 18 from bottom, for " figure 18 " read " figure 17." 



Plate II. figure 2. Gladopora verticillata. The engraver has omitted the "a" which should stand at the upper 

 left hand side at the semicircular notch. 



Plate II. figure 15. Conocardiwn ornatum. The engraver has omitted the delicate radiating lines on the ante- 

 rior side, and the delicate concentric lines of the rostrate side. 



Plate III. figure 3. Clidophorus McChesneyanus. The muscular impression has been omitted in the engraving. 



Plate III. figure 11. Liehas decipiens. The outline is palpably incorrect. Moreover, the lines separating the 

 articulations of the lateral lobes do not exhibit the curvatures noticed in the description. 



Plate III. figure 13. Acidaspis Ida. The engraver has omitted the furrow behind the ocular Jilet or thread on 

 the right side. 



Page 107. last sentence of first paragraph of Supplementary Note, the word "only" should lie transposed, »o 

 follow the word "quoted." 



Page 108, 2d line from bottom, for " relations " read " alations." 



Page 10s, last line, for "break " read "beak." 



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