Fine skeletal structures in rugosa.

Abstract

Instead of the teym "miero-structRre", "fine skeletal strueture" here purposefully defined means tissues of skeletal elements composing corallites observable uRder microseope at low magRifiea,tion.' This paper will present the result of observation of those struetures ln very eoncised form, although the au'bhor has made detailed study on a fairly large number of corals, ranging from 'the Ordovicia.nto Permi'an ln age.Next, the rr}eehanism of skeletal forma.tionand 1;he significance of ske}etal patterns will be ftdly inteypreted.FuTther, seeondary defoyma-tion and evolutional trends of fine structure will be brought into consideration.Finally, the taxonomie importance of fine skeletal structtires in rugosa will be briefiy diseussed. M. KAToTo all o them the writer's most eordia} thanks aye offered.S Historical revievLT on sttedy of " rnicro " structure of corals.Prior to the adoption of he microscope, taxonomie study of eorals had'to be entirely based on their externa} charaeters.Works by FRoMEN-TEL (1861) aRd D'ORBIGNy ( 1849) aye examples.EDwARDs and }IAIAfE authorities of eorals at that time, published eemprehensive monog'raphieal works on this group o organisrns ( 1857), based on their observations mainly on weatheyed or broken surfaees of corals, for the inspeetion of the inteynal charaeters of them.They utilized polished cross seetions ."tswell.IEIowever adoption of thin seetioia technique an(l wide use of the mieroscope have become good devices for every braneh of biology and byoLight brilliaRt results.IIEIDER's, BouRNE's and Kocff's studies in the 1880s all followed this stream.KocH (1882) was the first-who described fine skeletal structures in rugosa. in studying a corahkow known as CrT2/?)las'mct Zoveni x?vith aeanthine septa.A number o microseopie investigations appeared then in monographie studies on Mesozoic, Cenozoie corals and also, on some Palaeozoie forms.PRATz (1882), KoBy (1881) and VoLz (1896) were the authorities