﻿VI CONTENTS. 



Chapter V. — Foliage 81-104 



Historical 81-82 



Foliage of Cycadeoidea ingens (type) 83-94 



Prefoliation 86-87 



Form and structure of fronds and pinnules 87-94 



Preservation of microscopic features 9 X "92 



Comparison with existing cycads 93 



On Yale cycad No. 208 (a cotype of Cycadeoidea ingens) and its 



adventitious leaves 94"97 



Cycadeoidea colossalis (trunk 133) 98 



Cycadeoidea colossalis (trunks 2 and 10) 99-100 



Cycadella ramentosa 100-102 



Remarks on general characters of cycadeoidean foliage 100-102 



REPRODUCTIVE STRUCTURES (pages 105-186). 



Chapter VI. — Ovulate Cones 107-137 



Historical 107-108 



Ovulate cone of Cycadeoidea Wielandi 108-126 



General features 109-112 



Peduncle and its bundle supply 113-114 



Evidence of presence of hypogynous disks 114-115 



Bracts 115-116 



Interseminal scales 1 16-1 18 



Seed pedicels 1 18-120 



Seeds 120-126 



Embryos and pre-embryonal structures 124-126 



Cone-bearing habitus of various trunks 126-130 



Bisexuality 130-131 



Cycadeoidea Jenneyana (?) 131-132 



Cycadeoidea dacotensis (?) 133-134 



Cycadeoidea Marshiana I 35" I 36 



Resume 137 



Chapter VII. — Bisporangiate Axes 139-167 



Historical 139-143 



Organization of the bisporangiate strobilus of the Cycadeoidese 



( Materials) 143 



Cycadeoidea dacotensis 144-162 



Peduncle 146 



Bracts 146-147 



Ovulate cone 147-149 



Staminate disk 149-162 



Expanded strobili I 55 _I 56 



Histological details 157-162 



Synangia 158-159 



Pollen grains 159-162 



Cycadeoidea heliochorea 162 



Cycadeoidea ingens and C. Jenneyana 162-163 



Cycadeoidea Paynei 163-164 



Resume 165-167 



