430 SUBJECT INDEX 



Yagansia 131 zonation, boreal to arctic 109fF 



Yarmouth Interglacial 389 Zonitoides 163, 167 



Yeniseysk area 265 arboreus 169 



Younger Dryas 225,226,327 zoochorous dispersal 177,181 



Yukon Territory 115,118 Zoogenetes 163,167 



zoogeographical classification 127 

 Zostera 192, 195 

 ZannicheUia 192, 193 marina 192, 195, 196 



Zizania 192 stenophylla 195, 196 



