166 
26 
OT 
28 
30 
31 
Lateral branches straight ............:ccccscccscssecereereeceesessersseressenenssensssae® 17 
Lateral branches sinuous (margins broken by protruding autozooecial 
ADEMUUKES) ee wiseesscureeaetane-seeeteeseen ceaeese renee cee Penniretepora gracilis 
Median carina strong, straight Penniretepora frondiformis 
Median carina weak, straight Penniretepora normalis 
Median carina consists of 3 sinuous pustulose ridges ...........-.-:e0e 
Penniretepora flexicarinata 
Mictinistenmis tial oii tpec steerer sescstesnnersers eerecehecreeet eee ccrearrnssnenronswre nen 19 
Main stem Sinuous .............c:ccccescereeeereeeeeee Penniretepora elegantula 
[LAL ATMO NES STNELN? o5-cocrscoscacecqacnncnenertouéadobsossacoaacoossesecnscascesece¢ 20 
Lateral branches sinuous ............:::ccceeereeeeees Penniretepora cucullea 
Peristomes, horseshoe-shaped, developed on distal side of autozooecial 
BYDSTURELRSS ares cocoreaneniccncabeoouncosce-cecctouaseocacacebaashcnatoe Penniretepora pluma 
PETIStOMeS ASEM tereeeeeee neeneseeeeesenense ener Penniretepora sinuosa 
2 rows of autozooecia ON branches ..............:.ssscseesccsecsseseneseeeeceneeee 2D, 
More than two rows of autozooecia on branches .............:0:0+ee 23 
Lateral margins of branches serrated .......... Diploporaria marginalis 
Lateral margins flexuous or smooth ................++ Diploporaria tenella 
Branches delicate, flexuous, oval/circular apertures ............:0:eees 
SOE rR Do coca COLON EE CY EON DSDOTBOOTONOOECO Baculopora megastoma 
Branches robust, apertures with peristOMEs ..........:::seecesereeeeereeees 24 
Complete peristomes surround apertures .............-. Thamniscus colei 
Proximal peristomes Only ...........::cccceeceseeeeereee Thamniscus rankin 
Branches connected by dissepiments ...... Ptilofenestella carrickensis 
Branches bear no dissepiment ............:.::000:0c008 Thamniscus colei 
Zoaria ramose or encrusting, with polymorphic zooecia, distinct 
endozonal and exozonal differentiation .............scccscsesereesereteeeees 27 
Zaria POSSESS CYStOPOTES .......-.csceccccsseeceeeeseneneeeesceeneersecsseesestesseees 32 
Zoaria dendroid with zooecia budded from central axis ................. 34 
Mesozooecia developed .................scsssscsssessssenenscoerenceesrecccurcnsseseters 28 
Ext aZOOECLAIGEVE LOPE feeeesseetee cence easnsene tne eneeeeeee neers erect eeeeceeen 7S) 
Zoaria ramose with thick exozone and autozooecia heavily indented by 
FISANTU NODES 5s:ccenosecoecaococco Lessee anoaonicsoneasoasosoondes Leioclema indentata 
Exilazooecia common with many disposed between autozooecia...... 
DE Oc ee eo Otc coe ne eeE eae nce eSaares Dyscritella miliaria 
Exilazooecia relatively rare 50) 
Ring septa developed 31 
Hemiphragma developed ...............:0c1eeee: Stenophragmidium sp 
Zoaria ramose, autozooecial apertures circular, ring septa tips slightly 
thickened, deflected proximally, exilazooecia in clusters ............-.2++ 
ESECaRSSaNIEIE eNOS DIOTgTROCODEE Sona A a00 cabs ze RSCG OG SEER Ea BNaGMaCEECERC HCE Tabulipora urii 
Ww 
i) 
33 
40 
P.N. WYSE JACKSON 
Zoaria thin adnate sheets, autozooecial apertures polygonal, ring septa | 
planar/thin, exilazooecia rare ..........cccceeeeeeeeeeneees Tabulipora howsii 
Zoaria robust, exozone thin, autozooecial apertures oval, exilazooecia | 
Tabulipora minima — 
Zoaria encrusting, adnate, with well developed rectangular (vesicles) | 
cystopores between tubular autozooecia ......... Fistulipora incrustans 
Branches bifoliate with spherical CyStOpoOres ............:ccscssceeseeseeeesees 35 
Branches strap-like, zoaria budded from a plicated median wall, 
autozooecial apertures with proximal lumaria ............:.0::ccceeeeeeeeeeeene 
cares ca TAN Seeds RSE ERE OT ee Rca ane Sulcoretepora parallela | 
Branches sub-rounded, with a distinct keel and carina, autozooecia 
budded from a straight median wall .............. Goniocladia cellulifera 
Branches articulated, very slender (01—25mm), circular or polygonal in 
cross-section, hemisepta absent ..............c.-cescerceseeseeseeseeseeseeseeeeteeees 35 
Branches not articulated, cylindrical (05—60mm), hemisepta usually | 
JSYTSSTSVOLE HA ORAM) opp: cer eeesaco cocnnanone cee erBeeaBcOnec0a LoGaN: ae Sbo0e cece eS 
Autozooecial apertures present on all branch surfaces 
Autozooecial apertures absent from a distinct reverse surface 
don NE ee soe essen oad nade ee Sica eer ees ay Nematopora hibernica 
Branch cross-section polygonal, autozooecia budded in annular fash- 
ion, autozooecial apertures oval, separated from each other by 
longitudinal nid esis eseeesenessrscttennrerese-eteeesteeenmae Hexites paradoxus 
Branch cross-section circular, autozooecial budding radial, autozooecial 
apertures circular, with proximal peristOMES .........-s:eeseeeeetererereseees 
slssedisteleascaceaieeeninea race. ee tes enema oe eaSe Pseudonematopora planatus 
Metapores very common, arranged in linear rows in interapertural areas 
Streblotrypa pectinata | 
Metapores irregularly disposed in interapertural areas ...........2-.-::0000 
dcouddsengstensvost Gees OnBetsUc Es co ge te eeoRRE eee eno st sso een Clausotrypa ramosa 
Metapores either absent or only 1 per autozooeciuM .........-.2-.-100+- 38) 
Central axial cylinder present 
Axial cylinder not present ........2....-c1sssecsccsseseeseecenencecseceensassentecstenses 
Autozooecial apertures oval, of constant dimensions, with a large 
acanthostyle situated proximally, smaller stylets may be present ....... 
BOE Ee ce POOLS ESLER eee econ sce ob ode MEPREEES- Rhabdomeson progracile 
Autozooecial apertures pyriform, distally flared, of varying dimen 
sions, over 20 small stylets developed around apertures 
ra se CR ERE EPEC EN so -coccAREEE Rhabdomeson rhombiferum’ 
Autozooecial apertures circular, of constant size, with acanthostyles 
and heterostyles disposed in a circle around them, a single metapore 
may be situated proximal to autozooecia ..... Rhombopora cylindrica 
Autozooecial apertures circular to oval, of varying size around zoarium) 
