Annals of the South African Museum, Volume 41The Museum, 1952 - Natural history |
From inside the book
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Page 11
... valve between the posterior adductors ; imprints of anterior adductors very distinct in ovate pits with strong posterior ridges , closer together than posterior pair and situated just behind the centre of the valve ; small pits for ...
... valve between the posterior adductors ; imprints of anterior adductors very distinct in ovate pits with strong posterior ridges , closer together than posterior pair and situated just behind the centre of the valve ; small pits for ...
Page 26
... Valves convex , the ventral much more so than the dorsal ; sulcate ( i.e. with a shallow sulcus in the dorsal valve opposed to a fold in the ventral valve ) ; margins waved by alternate multicostation . Cardinal area in both valves ...
... Valves convex , the ventral much more so than the dorsal ; sulcate ( i.e. with a shallow sulcus in the dorsal valve opposed to a fold in the ventral valve ) ; margins waved by alternate multicostation . Cardinal area in both valves ...
Page 28
... valve . Ventral valve deeper than dorsal , longitudinally keeled . Folding sulcate . Beak slightly incurved , with a rather large incomplete foramen , bounded laterally by two small deltidial plates which curve upwards towards the ...
... valve . Ventral valve deeper than dorsal , longitudinally keeled . Folding sulcate . Beak slightly incurved , with a rather large incomplete foramen , bounded laterally by two small deltidial plates which curve upwards towards the ...