Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 816
mblanceto Orbiculina in its plan ofgrowth, whilst in every otherrespect it is essentially dif-ferent. If the principal cham-bers of an Opemdina weredivided into chamberlets bysecondary partitions in a direc-tion transverse to that of theprincipal septa, it would beconverted into a… … Fig. 577.—Hctcrosteghia. 760 MICKOSCOPIC FORMS OF ANIMAL LIFE age; so that the apertural margin extends round a large part of theshell, which thus tends to become discoidal. And it is not a littlecurious that we have in this series another form, Cycloclypens, whichbears exactly the same relation to…
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