Figure E E.1–E.4: Silhouettes of the exteriors of the
right valves of rostroconchs. E.1: Hippocardia from Lower
Mississippian rocks of Ireland, about 50 mm in size. E.2:
Technophoris from Upper Ordovician rocks of Ohio, about
25 mm in size. E.3: Conocardium from Mississippian rocks
of England, about 35 mm in size. E.4: Bigalea from Middle
Devonian rocks of Michigan, about 12 mm in size. E.5–E.8:
Cambrian and Ordovician pelecypods showing variation in
shape and internal features. E.5: Fordilla from Lower Cambrian
rocks in New York, about 5 mm in size. E.6: Pholadomorpha
from Upper Ordovician rocks of Ohio, about 60 mm in size.
E.7: Cycloconcha from Upper Ordovician rocks in Ohio, about
15 mm in size.E.8: Cyrtodonta from Middle Ordovician rocks in
Kentucky, about 40 mm in size.
Figure E E.1–E.4: Silhouettes of the exteriors of the
right valves of rostroconchs. E.1: Hippocardia from Lower
Mississippian rocks of Ireland, about 50 mm in size. E.2:
Technophoris from Upper Ordovician rocks of Ohio, about
25 mm in size. E.3: Conocardium from Mississippian rocks
of England, about 35 mm in size. E.4: Bigalea from Middle
Devonian rocks of Michigan, about 12 mm in size. E.5–E.8:
Cambrian and Ordovician pelecypods showing variation in
shape and internal features. E.5: Fordilla from Lower Cambrian
rocks in New York, about 5 mm in size. E.6: Pholadomorpha
from Upper Ordovician rocks of Ohio, about 60 mm in size.
E.7: Cycloconcha from Upper Ordovician rocks in Ohio, about
15 mm in size.E.8: Cyrtodonta from Middle Ordovician rocks in
Kentucky, about 40 mm in size.
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