RT Journal Article SR Electronic T1 On a new species of fossil from the Lower Silurian [Cyrtolites costatus] JF American Journal of Science JO Am J Sci FD American Journal of Science SP 26 DO 10.2475/ajs.s3-3.13.26 VO s3-3 IS 13 A1 James, Uriah Pierson YR 1872 UL http://www.ajsonline.org/content/s3-3/13/26.abstract AB