Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 817
blance to Cycloclypens. Theseare only known in the fossil state; and their structure can only beascertained by the examination of sections thin enough to be trans-lucent. When one of these discs (which vary in size, in differentspecies, from that of a fourpenny-piece to that of half a crown oreven… … Fig. 578.—Section of OrbitoidcsFurtisii, parallel to the surface,traversing, at a, a, the superficiallayer, and at b, b, the medianlayer. ORBITOIDES 761 species, circular in others, arranged with a general but not constantregularity in concentric circles (figs. 578, 579, b, b); the other,…
Microscopy
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