Loop development of the Pennsylvanian terebratulid Cryptacanthia.
Series: Smithsonian miscellaneous collections,; v. 134, no. 3; Smithsonian miscellaneous collections ;; v. 134, no. 3.
Publisher: Smithsonian Institution
Published: 1957
Place of publication: Washington
Language: eng
Number of pages: 18
Subjects: Cryptacanthia.; Paleontology -- Pennsylvanian.
Notes: Bibliography: p. 16.
Smithsonian Institution, Publication 4267.
At head of title:  Charles D. and Mary Vaux Walcott Research Fund.