Annals of the South African Museum, Volume 7 |
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Page 99
They are prominent , well incurved , and slightly recurved . The cardinal margin
slopes down gradually , forming a long , almost straight outline , and passes by a
rather abrupt curve into the short , convex posterior border . In front of the umbo ...
They are prominent , well incurved , and slightly recurved . The cardinal margin
slopes down gradually , forming a long , almost straight outline , and passes by a
rather abrupt curve into the short , convex posterior border . In front of the umbo ...
Page 105
Prominent transverse ridges or irregular ribs cross the area in the posterior half of
an adult individual , terminating above and below in the marginal tubercles and
also between them . These ridges make their first appearance somewhat ...
Prominent transverse ridges or irregular ribs cross the area in the posterior half of
an adult individual , terminating above and below in the marginal tubercles and
also between them . These ridges make their first appearance somewhat ...
Page 167
Description . — The shell consists of six whorls , possibly more . The whorls are
flattened above , and the upper surface slopes very gently away from the spiral
suture , terminating abruptly at a prominent marginal keel which marks the upper
...
Description . — The shell consists of six whorls , possibly more . The whorls are
flattened above , and the upper surface slopes very gently away from the spiral
suture , terminating abruptly at a prominent marginal keel which marks the upper
...
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Contents
ExogyRA | 25 |
extoni Cleithrolepis S Woodward 264 | 31 |
baini Mytilus Sharpe | 33 |
8 other sections not shown
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Common terms and phrases
adult African angle anterior apertures appears atherstoni baini Band becomes beds bone border Broom characters closely collection comparable comparison considerably convex Cretaceous curved d'Orbigny described developed diameter differs direction distinct distinguished dorsal doubt elongated evidence fauna figure flank fossils front frontal further genus Geol greater greatest half height Holcostephanus individual Jurassic known lateral length less lower margin marked measures middle Museum narrow Neocomian obtained occur Oomia ornamentation outline passes Plate portion posterior present preserved probably prominent referred regarded region relatively remarks represented resemblance ribs ridges Rogers rounded sculpture seems seen separated Sharpe shell shown shows side similar single slightly South African species specimen stage Sunday's River surface Tate traced Trigonia tubercles Uitenhage umbilical umbo umbonal upper valve whorl
Bibliographic information
| Title | Annals of the South African Museum, Volume 7 Annals of the South African Museum, South African Museum |
| Author | South African Museum |
| Publisher | South African Museum, 1913 |
| Original from | University of Minnesota |
| Digitized | 4 Oct 2013 |
| Export Citation | BiBTeX EndNote RefMan |