Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 815
each other laterally, soas to form a network such asis seen at b, b, fig. 576. Atcertain other points, d, d, d,tig. 574, the shell-substanceis not perforated by tubes, butis peculiarly dense in its texture, forming solid pillars which seemto strengthen the other parts ; and in Nummulites whose… … IB ill writ- c Fici. 575.—Portion of horizontal section ofNummulites showing the structure of thewalls and of the septa of the chambers :a, ((, a, portion of the wall covering threechambers, the punctations of which are theorifices of tubuli; b, b, septa between thesechambers containing canals…
Microscopy
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