Position and locality: Upper Coal Measures, Howard limestone, Topeka, Kan.
This species is very closely related to A. curta Swallow, but differs from it in having a straighter hinge and a more remote beak. It is from a lower horizon. In the latter respect it differs from McChesney’s species also.
Paleontological Laboratory, Indiana University,
May 22, 1902.
Explanation of Plate V.
All figures about natural size. Drawings by C. McK. Beede.
Ceriocrinus harshbargeri.
Fig. 1. Right posterior view of type. Fig. 1a. Diagram of anal plates of same. Fig. 1b. Surface detail enlarged. Fig. 1c. Diagram of basal view. Fig. 2. Calyx of another specimen, probably of this species. Fig. 2a. Diagram of a portion of posterior view of another slightly smaller specimen, showing variation in size of anal plate.
Aviculopecten subequivalvus.
Fig. 3. View of type. One side incomplete. Fig. 3a. Opposite valve of another specimen.