A Paleozoic brachiopod shell partly broken to show the internal spiral arm-supports. Mississippian limestones.…
The shell of Athyris concentrica, a species of brachiopod.
The dorsal valve of the brachiopod Atrypa reticularis.
The shell of Atrypa reticularis, a species of brachiopod.
A mollusk radiate from the Paleozoic time, Pentamerus oblongus, a brachiopod from the Clinton group.
The shell of Spirifer striatus, a species of brachiopod.
Interior of the dorsal valve of Spirifer striatus.
The interior view of the brachiopod Waldheimia flavescens.
The Lingula have tongue-shaped shells with a long fleshy stalk, or pedicle, with which the animal burrows…
The Lingula antigua is a little bivalve shell belonging at the bottom of the class Brachiopoda. The…
The Lingula prima is a little bivalve shell belonging at the bottom of the class Brachiopoda. The inarticulate…
A mollusk radiate from the Paleozoic time, Orthis varica of the Niagara group.
An ancient mollusk from the Paleozoic time, Spirifer mucronatus.
An ancient mollusk from the Carboniferous Age, the Spirifer cameratus.
Spirifer sowerbyi, an extinct brachiopod.
A characteristic modern Brachiopod of the northern Atlantic coast.