other islands in the Caribbean, but the experience had to come to and end, as the extended absence from home, which coincided with the deaths of his two remaining children, caused a rift between Pfeiffer and his wife that led to their divorce almost immediately upon his return to Europe in 1841. After remarrying, Pfeiffer adopted a sedentary and academic lifestyle, focusing his energy on the specimens and data he had collected in Cuba, classifying more than 20 new genera and species of mollusks. He proved to be a prolific publisher, and expanded his interest from conchology to the botany that had been his first love, writing several treatises on the nature flora of Hesse and its surrounding regions, coedited with the esteemed botanist Johann Cassebeer. Since 1836, Pfeiffer had been a member of the Cassel Society for Natural history, and from 1837 a member of the German National Academy of Sciences Leopoldina and the Regensburg Botanical Society. In 1868, Pfeiffer and his colleagues Wilhelm Kobelt and Karl Ludwig Fridolin von Sandberger added a further membership with the founding of the German Malacozoological Society. In 1871, Pfeiffer's already failing health was dealt a blow with the death of his youngest son Wilhelm, only 19 years old, on the battlefield in France, one of innumerable casualties of the Franco-Prussian War. In 1874, the increasingly frail Louis Pfeiffer undertook a two month journey to Catalonia, where his eldest son Hermann was in business as a merchant, and the trip appears to have been an uneventful one, despite conceding directly with the coup d'etat that toppled the First Spanish Republic. In 1875, on the 50th anniversary of his doctorate, and the 70th anniversary of his birth, he was surprised by the medical faculty of the University of Marburg, who renewed his doctoral credentials. In addition to the renewal of his medical doctorate, he was also given an honorary doctorate in philosophy by the philosophy faculty, honoring a life spent in pursuit of knowledge. Pfeiffer was also awarded the Prussian Order of the Red Eagle, 4th class, in gratitude for scientific service to the nation. Ludwig Carl Georg Pfeiffer died of a lung infection on October 2, 1877. Animals described by Pfeiffer He named more than 20 new genera and species, some of which have become synonyms: Albinaria praeclara L. Pfeiffer, 1853 Belgrandiella parreyssii L. Pfeiffer, 1841 Bittiolum varium L. Pfeiffer, 1840 Bourciera L.