Remarks on the spectrum of the Dirac operator. We describe a new family of examples of hypersurfaces in the sphere satisfying the limiting-case in C. Bar's extrinsic upper bound for the smallest eigenvalue of the Dirac operator. To cite this article: N. Ginoux, C. R. Acad. Sci. Paris, Ser. 1337 (2003). (C) 2003 Academie des sciences. Public par Editions scientifiques et medicales Elsevier SAS. Tons droits reserves.