. Bulletin of the Natural Histort Museum. Geology series. LOWER CARBONIFEROUS BRYOZOA 131. orne but not all zoaria. 20 to 24 heterostyles ( wide) in bne or two rows flank autozooecial apertures on all zoaria A ongitudinal groove frequently occurs between heterostyle rows which probably marks the position of the zooecial boundary. \canthostyles have a thick granular core and develop from the base Ijf the exozone. Heterostyles have a thinner granular core and grow JTom within the exozone. Skeletal lamellae are bent around licanthostyles. Table 7 Measurements of Rhombopora cylindrica
. Bulletin of the Natural Histort Museum. Geology series. LOWER CARBONIFEROUS BRYOZOA 131. orne but not all zoaria. 20 to 24 heterostyles ( wide) in bne or two rows flank autozooecial apertures on all zoaria A ongitudinal groove frequently occurs between heterostyle rows which probably marks the position of the zooecial boundary. \canthostyles have a thick granular core and develop from the base Ijf the exozone. Heterostyles have a thinner granular core and grow JTom within the exozone. Skeletal lamellae are bent around licanthostyles. Table 7 Measurements of Rhombopora cylindrica (in mm). N=23. NM X Mn Mx CVw CVb :d 187 l\ 4 8 10 _ '2 155 3 6 >iDl 219 \D2 219 WTl 219 WT2 219 ^Dl 21 /ID2 21 ' \.n 34 vW 63 'E 18 |)ISCUSSION. Rhombopora cylindrica is quite distinctive and may le easily distinguished by the presence of oval-circular autozooecial pertures, a central axis, a thin exozone, and structurally varied canthostyles. Coefficients of variation for both zoarial (ZW) and zooecial ADl, AD2, IWTl, and IWT2) parameters within colonies are low. ,"Vw values for metapore diameter (MDl and MD2) as well as icanthostyle height (AH) and width (AW) are large. They are due to le space-filling function of metapores, abrasion of acanthostyles, nd poor replacement by silica of small skeletal elements. This is pflected by examining autozooecia aperture dimensions which /ere more varied in silicified specimens than in calcified specimens. Coefficients of variation between colonies are all extremely low. Millepora similis was first described by Phillips (1841) as a apposed coral from the Devonian of south-west England. Phillips collected specimens from two localities: Cannington Park
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