Vols. 1-4 by Louis Agassiz were published from 1857-1862; Vol. 5, North American starfishes by Alexander Agassiz, appeared in 1877. Louis Agassiz was, for his time, the leading comparative anatomist in America and a virulent opponent of Darwinism. Ten volumes of this set were planned but only 5 appeared. Volume one contains Louis Agassiz's theoretical work, Essay on Classification. The remainder of the set is valuable for its descriptions of American turtles. Digital facsimiles of the 5 vols. from Biodiversity Heritage Library at this link.