644 



HAROLD HEATH, 



Mollu!cîftmÏ^\'diÏTo^L'bL^Tf^' "'^^Tr '^' ontogeny of Annelids and 

 three quarteUes of ZTLH ^^ ^*'^*' ^""^ ^^^ modifications undergone by the 



portion „, ,h. foô "ccSS by .blfi ' ,' °»°',\^'V""'«'i i" ?•'»«««»• po.Ll. Tb.t 

 pnore WUI, three trunk segments (prlnelp.lly from Mead's üg. D, diagram VII). 



