Texas Fossils: An Amateur Collector's Handbook
c. Plane of symmetry at right angles to hinge-line; without
“ears”, not “Scallop-like”; commonly with opening in beak, inequivalved Brachiopod 2. Fossil tapering, cylindrical or cone-shaped a. Cone-shaped, internal longitudinal partitions or septa Coral b. Tapered, internal transverse partitions Cephalopod