Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 677
ed the pre-ceding group, is now restricted to those which have the shell formedoutside the capsule. This shell may, as in the preceding, be asimple sphere composed of an open siliceous network, as inEthmosphcera (Plate xix., fig. 1); or it may consist of two or threeconcentric spheres connected by… … if MP5
Microscopy · Biology
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