112 



Dr, Dawson on an Erect Sigillaria 



which is thin and marked on its outer surface with interrupted 

 ridges, almost precisely in the manner of the corresponding coat 

 in the seed of Pinus pinea. This coat is often pyritised, and in 



Figs. 1 to 5. — Trigonocarpum Hookeri, Dawson ; from the Coal" 

 measures of Cape Breton. 



Fig. 3. Fig. 5. 



Fig. 1. 



Fig. 2. 



Fig. 1. Perfect specimen, natural size. 



Fig. 2. Specimen deprived of its outer coating. 



Fig. 3. Broken specimen magnified. 



Fig. 4. Section magnified : a, the testa ; 6, the tegmen ; c, the nucleus, 



and dj the embryo. 

 Fig. 5. Portion of the surface of the inner coat more highly magnified. 



some specimens it presents toward the smaller end indications of 

 three ridges. It corresponds, no doubt, to the outer coat of the 

 ordinary Trigonocarpa. 3. A nucleus occupying the whole in- 



