Annals of the South African Museum, Volume 7 |
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Page 90
The shells still retain traces of the strong periostracum , and the elongated
external ligament is also in part preserved . This is apparently the form cited by
Messrs . Rogers and Schwarz as Psammobia , * and such a generic
determination might ...
The shells still retain traces of the strong periostracum , and the elongated
external ligament is also in part preserved . This is apparently the form cited by
Messrs . Rogers and Schwarz as Psammobia , * and such a generic
determination might ...
Page 125
The length is relatively great compared with the height ; the cardinal margin is
elongated , while the siphonal margin is short . The area is slightly convex in form
, without a marked median carina or groove ; the escutcheon is large , and ...
The length is relatively great compared with the height ; the cardinal margin is
elongated , while the siphonal margin is short . The area is slightly convex in form
, without a marked median carina or groove ; the escutcheon is large , and ...
Page 142
Tancredia schwarzi , from which it differs by its greater elongation and relatively
reduced height ; it has a more obtuse ... the genus was established , is a more
elongated shell and is more inequilateral and less definitely carinated posteriorly
.
Tancredia schwarzi , from which it differs by its greater elongation and relatively
reduced height ; it has a more obtuse ... the genus was established , is a more
elongated shell and is more inequilateral and less definitely carinated posteriorly
.
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Contents
ExogyRA | 25 |
extoni Cleithrolepis S Woodward 264 | 31 |
baini Mytilus Sharpe | 33 |
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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