Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 409
Structure of siliceous valve of Coscinodiscus oculus Iridis:—1. Hexagonalareola of inner or eye-spot layer; 2. Areola of outer layer. la}^* is much stronger and thicker than the lower one ; and theframework of its hexagons more readily exhibits its beaded appear-ance. The lower layer is nearly…
Microscopy · Biology
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