INDEX OF ILLUSTRATIONS 
PLATE 
@oenber-beds. ..<.. ¢h 2s « 4s « « +» SRV 
Ambrosia pollen seasonal variation. . . . . XXXVI 
Archaeological maize from Venezuela... . XVI 
Aristolochia medicinalis R.H#.Schult. . . . . XXX 
Baccaurea dulcis (Jack) Muell.-Arg. . . X, XI, XIV 
Baccaurea Motleyana Muell.-Arg. IX, X XI, XII 
Baccaurea racemosa Muell.-Arg. . IX, X, XI, XIII 
Baccaurea sapida Muell.-Arg. . ....... XV 
Betula pollen seasonal variation . . .... . XXII 
Boletus manicus Heim ............ .T11 
Datura candida (Pers.) Safff . . XXVII, XXVIII 
Datura sanguinea Ruiz & Pav. . . XXVIII, XXITX 
Datura suaveolens H. & B. ew Willd. . . . XXVII 
Fossil pollen types associated with Rhizophora XLII 
Fossil 'Tripsacum and maize pollen. . . . . . . VII 
Gramineae pollen seasonal variation ..... XXV 
Hymenaea Courbaril LZ. . ......... =XLI 
Juniperus pollen seasonal variation ..... XXI 
Map of Mexican amber sites ...... XXXIX 
{ vii | 
