This notice is the fifth in a series recording the transfer of fossils described by Rousseau H. Flower (1913-1988) to the Smithsonian Institution and the U.S. National Museum. During a long, productive, and colorful career, Rousseau described more than 400 new fossil taxa (Wolberg, 1988). Most of Rousseau's fossils have been maintained in the collections of the New Mexico Bureau of Mines and Mineral Resources. The fossils in this transfer were sent to Rousseau in 1952 by William J. Sando, then a graduate student at Johns Hopkins University, who collected them during his research on the Beekmantown Group of Maryland (Sando, 1957). In 1955, Rousseau submitted a manuscript to the Journal of Paleontology and this was published in 1956. Some controversy seems to have surrounded the publication of the paper; we have found a file of correspondence related to that publication and it is very “Roweresque” in content. In addition, Rousseau cataloged the Sando fossils into the NMBM&MR's collection, but from the associated correspondence there seems to be little doubt but that the collection was intended to be reposited in the Smithsonian.