NuMBER 7 (September 2, 1966) 
Boston Pollen Survey—1965 Preliminary Report 
By Arruro Corso aND MaNueL Lopez . . . 218 
Number 8 (December 80, 1966) 
Notes on the Species of Tree Daturas 
By Mervin L. Brisron . . .. . . . . . . 229 
NuMBER 9 (April 28, 1967) 
Studies in American Orchids VI 
By Lesuir A. GaRay.......... . 249 
De Plantis Toxicariis e Mundo Novo Tropicale 
Commentationes I 
By Ricuarp Evans Scuuurrs ..... . . 265 
Tripsacum in Peru 
By ALEXANDER GROBMAN ..... . . . .) 285 
NuMBER 10 (July 19, 1967) 
Mangrove Pollen at the Depositional Site of Oligo- 
Miocene Amber from Chiapas, Mexico 
By Jean H. Lancenunem, Berry L. HackNner 
AND ALEXANDRA BarRrLetr . .. . . . . 289 
