Annals of the South African Museum, Volume 7South African Museum, 1913 - Natual history |
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Page 4
... convex reverse faces , such as Crisina marginata , d'Orbigny , in some cases may not have been forms encrusting some object , such as seaweed , which has since perished . Distribution . Neocomian and Cenomanian . GENUS CRISINA , d ...
... convex reverse faces , such as Crisina marginata , d'Orbigny , in some cases may not have been forms encrusting some object , such as seaweed , which has since perished . Distribution . Neocomian and Cenomanian . GENUS CRISINA , d ...
Page 5
... convex or flat ; there is no keel on the obverse face ; the zoœcia are immersed , and when the reverse face is flat the zoocial boundaries are clearly marked ; the lateral series of apertures are quite regular , and just reach the ...
... convex or flat ; there is no keel on the obverse face ; the zoœcia are immersed , and when the reverse face is flat the zoocial boundaries are clearly marked ; the lateral series of apertures are quite regular , and just reach the ...
Page 6
... convex reverse face ; the lateral series are regular and each contains four or five apertures ; the apertures are circular . This form is very like C. excavata ( d'Orbigny ) , but has fewer apertures in a lateral series , and the zoœcia ...
... convex reverse face ; the lateral series are regular and each contains four or five apertures ; the apertures are circular . This form is very like C. excavata ( d'Orbigny ) , but has fewer apertures in a lateral series , and the zoœcia ...
Page 8
... convex and the reverse face concave . When the breadth of the zoarium has reached about one - third of its length , it divides into two subcylindrical branches ; one of these is broken off short , but the other continues for about 1.5 ...
... convex and the reverse face concave . When the breadth of the zoarium has reached about one - third of its length , it divides into two subcylindrical branches ; one of these is broken off short , but the other continues for about 1.5 ...
Page 13
... convex above , flattened below , somewhat concave around the peristome ; height equal to less than half the diameter ; greatest diameter in the lower third . Apical disc rather small , not preserved . Ambulacra not quite as wide as the ...
... convex above , flattened below , somewhat concave around the peristome ; height equal to less than half the diameter ; greatest diameter in the lower third . Apical disc rather small , not preserved . Ambulacra not quite as wide as the ...
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Common terms and phrases
Acanthodiscus adult Ammonites angle aperture Aptian Astarte atherstoni Sharpe baini bank of Sunday's bone breadth Broom carinal characters closely Coega collection comparison conocardiiformis convex costate Cutch Cynodonts d'Orbigny developed diameter dorsal elongated Eriphyla escutcheon Exogyra fauna figure flank flattened fossils frontal genus Geol Geological German East Africa Graaff-Reinet groove Hauterivian height herzogi Holcostephanus holubi imbricata Jurassic keel Kitchin Krauss left valve length less Lower Cretaceous Lycett margin Massospondylus narrow Neocomian Neumayr occur Oolitic Oomia beds ornamentation outline Pareiasaurus Pavlow Pecten Plate posterior posteriorly preserved represented resemblance ribs ridges right valve Rogers and Schwarz rogersi sculpture shell similar slightly South African Museum species specimen spiral stage Stoliczka stowi Sunday's River surface suture Tate Tate's transverse Trigonia Trigonia ventricosa tubercles Uhlig Uitenhage Uitenhage beds Uitenhage Series umbilical umbilicus umbo umbonal region upper W. T. Blanford whorl zoarium Zwartkop's River