EREATA. 



Page 5, liiie 3 from bottom, between our and friend, insert 



respondent 

 Page 12, line 13, after continued, insert as the spinal cord or 



" marrow " 

 Page 13, line 9, dele Latin 

 Page 26, line 17, for 11 read II. 

 Page -27, line 17, for 11 read 11. 

 Pages 54 — 57. This arrangement of the new genus Sagartia 



is in accordance with the ordinarily received notions on 



the subject. The author's own classification may be 



seen in pages 98, 99. 



