Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 798
h large glistening sand-grains aresometimes set at regular intervals, as if for ornament. On layingopen the spire it is found to be very regularly divided into chambersby partitions formed of cemented sand-grains (b), a communicationbetween these chambers being left by a fissure at the inner… … Fig. 558.—Cyclammina cancellata, showing at a, its external aspect;b, its internal structure ; c, a portion of its outer wall in section, morehighly magnified, showing the sand-grains of which it is built up andthe passages excavated in its substance. each passage being surrounded by a very regular…
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