Annals of the South African Museum, Volume 7 |
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Page 138
margin marks the posterior limit of a weakly defined posterosuperior area of the
valve - surface . This is only demarcated from the flank by a weak and flattened
fold of the surface which passes obliquely backwards from the umbo to the
postero ...
margin marks the posterior limit of a weakly defined posterosuperior area of the
valve - surface . This is only demarcated from the flank by a weak and flattened
fold of the surface which passes obliquely backwards from the umbo to the
postero ...
Page 140
The oblique posterior border has a sub - angular junction with the inferior border .
The greatest height occurs at the umbo . The valves are weakly inflated , most
strongly so posteriorly to the middle , and are anteriorly compressed and
flattened ...
The oblique posterior border has a sub - angular junction with the inferior border .
The greatest height occurs at the umbo . The valves are weakly inflated , most
strongly so posteriorly to the middle , and are anteriorly compressed and
flattened ...
Page 155
The umbo is very inconspicuous , and is situated slightly in front of the middle of
the shell . The upper margin slopes down very gently in front and behind the
umbo . The frontal margin is short and has a rounded convex profile ; towards this
...
The umbo is very inconspicuous , and is situated slightly in front of the middle of
the shell . The upper margin slopes down very gently in front and behind the
umbo . The frontal margin is short and has a rounded convex profile ; towards this
...
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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 |