Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 635
d as those of which the test of Astrorliiza is made up, thegrains that form the neck are firmly united by ferruginous cement,forming a very smooth wall to the tubular orifice. 476. The highest development of the Arenaceous type at thepresent time is found in the forms that imitate the very… … Cyclammina cancellata.-—showing at «, its external aspect;6, its internal structure ; c, a portion, of its outer wall morehighly magnified, showing the sand-grains of which it is builtup, and the passages excavated in its substance. from depths ranging downwards to 1,900 fathoms, the…
Microscopy · Biology
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