More cards in this set

Card 6

Front

Extension of the valves to form 'wings'

Back

Preview of the front of card 6

Card 7

Front

Smooth or weakly ribbed valves

Back

Preview of the front of card 7

Card 8

Front

No pedicle opening

Back

Preview of the front of card 8

Card 9

Front

Flat valves with a large resting area

Back

Preview of the front of card 9

Card 10

Front

One margin of the shell upturned away from sediment

Back

Preview of the front of card 10