ERRATA ET CORRIGENDA. 



Page 



11, for "granulosa" read " granulata." 



62, for " termissima " read " tenuissima.** 

 132, for " dasyhypUa " read " dasyphylla." 

 145, for " Coralline " read " Corailina." 

 149, for " Mesogloia" read " Melobesia." 

 190, for " Grymnogongrius" read " Gymnogongrus." 

 211, for " Odius' Bay " read " Odin's Bay." 

 284, for " Conferveaerea " read " Conferva aerea." 

 255, at line 8, after " between" insert the word " tide* marks." 



O. S. is an abbreviation of the words " Other Species." 



Omitted at page 90, the description of Ectocarpus Siliculosus. A com- 

 mon species, resembling in its outward aspect E. Iittoralis, but rather softer 

 in substance and more feathery in its branching. Microscopically it may 

 always be known by the pod- like fruit, borne on little stalks and narrowed 

 to a sharp point. Annual. Summer. On algae between tide-marks, and in 

 three to four fathom water. 



