. Bulletin of the Natural Histort Museum. Geology series. LOWER CARBONIFEROUS BRYOZOA TE ET. ^ M^^AU/AVJ iwT,;;§ § ADl ^ ^ MD2 • AD2 Fig. 18 Measurements taken on rhomboporid and hyphasmoporid cryptostomes in this study: ZD = Width of zoarium measured I perpendicular to growth direction; MD = Metapore diameter; MDl = Metapore diameter measured parallel to growth direction; MD2 = Metapore diameter measured perpendicular to growth direction; AH = Acanthostyle height from base to tip; AW = Acanthostyle width [ measured at its base; ADl = Autozooecia apertural diameter measured ; parallel to growt
. Bulletin of the Natural Histort Museum. Geology series. LOWER CARBONIFEROUS BRYOZOA TE ET. ^ M^^AU/AVJ iwT,;;§ § ADl ^ ^ MD2 • AD2 Fig. 18 Measurements taken on rhomboporid and hyphasmoporid cryptostomes in this study: ZD = Width of zoarium measured I perpendicular to growth direction; MD = Metapore diameter; MDl = Metapore diameter measured parallel to growth direction; MD2 = Metapore diameter measured perpendicular to growth direction; AH = Acanthostyle height from base to tip; AW = Acanthostyle width [ measured at its base; ADl = Autozooecia apertural diameter measured ; parallel to growth direction; AD2 = Autozooecia apertural diameter measured perpendicular to growth direction; IWTl = Autozooecia I apertural spacing measured parallel to growth direction; IWT2 = 1 Autozooecia apertural spacing measured perpendicular to growth : direction. Zl = Number of autozooecial apertures contained in 1mm-; I Z2 = Number of autozooecial apertures contained within a 2mm line ' measured parallel to growth direction; AR = Number of autozooecial I apertural rows measured around zoarium; ET = Endozone thickness; TE ' = Exozone thickness. ncreasingly pyriform and equidimensional. This variation in pertural size is reflected in apertural spacing; these two parameters apertural size and apertural spacing) are inversely proportional to ach other. Immediately after branching, elongate autozooecial pertures developed around the complete circumference of the aughter branch. Differentiation of apertural dimensions occurs listally within two or three generations along the branch. Interapertural walls are gently sinuous or occasionally straight jnd may be raised to produce a ridge between apertural rows. One or wo rows of small short acanthostyles ( in diameter) fa developed along this ridge. When two rows are present they are aparated by a distinct furrow. Autozooecial apertures are surrounded by 24 to 30 acanthostyles, 1 various patterns. Commonly they flank only lateral
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