COKKECTIONS. 



Vol. I. 



On page 18, line 6, read " ovary " instead of " ovum." 



In the article on " Variation in the Operculum of Serpula," pp. 57-60, delete 

 all paragraph " C " on p. 60, also the whole of the last five paragraphs of the 

 article from the words " so much for collateral evidence," etc. This is necessary 

 as the dorsal processes, or " tentacles " of Sabella, are now known to be processes of 

 the collar, and thus not homologous with the operculum of Serpula. 



Vol. II. 



In the explanation of Plate V., for "Pigs. A to D, Plumularia pumila" read 

 " Figs. A to D, Sertularia pumila." 



Page 24. Note that the Pteropoda are now definitely merged with the 

 Gastropoda and do not constitute a separate class. 



Page 80. Let the 16th line from the bottom read " asserts that it will be only 

 the effects of hatcheries such as this, that can prevent." 



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