Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 1072
art of the minuter kinds ofForaminifera, especially Globigevince., whose shells are imbedded in amass of apparently amorphous particles, many of which, nevertheless,present indications of being the disintegrated fragments of similarshells^ or of larger calcareous organisms. In the chalk of… … Fig. 750.—Microscopic organisms in chalk from Gravesend : a, b, c,d,Textularia globulosa; e, e, e, Botalia aspera; f, Textularia aculeata;g, Planularia hexas; h, Navicula. is made up of the shells of Cytherina, a marine form of entomo-stracous crustacean. Different specimens of chalk vary greatly…
Microscopy
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