Annals of the South African Museum, Volume 7 |
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Page 79
While , in the progress from Ostrea to Gryphæa , there is diminished duration of
the attached habit , so that the typical Gryphæa is fixed by cementation of the left
valve only during the young stage , examples are not wanting in which the highly
...
While , in the progress from Ostrea to Gryphæa , there is diminished duration of
the attached habit , so that the typical Gryphæa is fixed by cementation of the left
valve only during the young stage , examples are not wanting in which the highly
...
Page 109
In T. holubi , the stage where the area is demarcated by an upper and lower
marginal row of tubercles and marked by a median longitudinal row , persists
until half the adult dimensions have been reached . In T. mamillata , this
trituberculate ...
In T. holubi , the stage where the area is demarcated by an upper and lower
marginal row of tubercles and marked by a median longitudinal row , persists
until half the adult dimensions have been reached . In T. mamillata , this
trituberculate ...
Page 121
even at this early stage , but the ribs encroach slightly upon the smooth
escutcheon . This is clearly seen in the neanic stage , where the escutcheon
begins to increase rapidly in breadth . Very close to the umbonal apex , however ,
it is difficult ...
even at this early stage , but the ribs encroach slightly upon the smooth
escutcheon . This is clearly seen in the neanic stage , where the escutcheon
begins to increase rapidly in breadth . Very close to the umbonal apex , however ,
it is difficult ...
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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 |