134 BOTANICAL GAZETTE [OCTOBER 
Fic. 8.—Diagrammatic transverse sections of various Pteridosperm ovules and 
pollen sacs to illustrate numerical relations they show to Heterotheca and one 
another: on left are a, Sphaerostoma; b, Lagenostoma; c, Conostoma; d, Physostoma; 
on right are a', Polylophospermum; ', Trigonocarpus Parkinsoni; o, T. Shorensis; 
in center are I, Heterotheca Grievii; II, Crossotheca Hoeninghausi; III, Telangium 
Scottii; IV, Codonotheca caduca. Vascular bundles indicated by small ring in each; 
arrows denote different phyletic lines; diagrams have been adapted from those of 
Scott and MASLEN, OLIVER, OLIvER and SauisBury, SELLARDS, and three of writer’s, 
references to which occur in text; relative size of bodies concerned has been neglected 
for convenience of comparison. 
