Berlin, sumptibus C. Salfeld: xviii + 302.

–Allen 523. Introduces the name Sirenia, applying it to a family within the "Ordo Natantia", and recognizes and diagnoses three monospecific genera: Manatus, Halicore (new name), and Rytina (new name) (140-141). These are based on, respectively, the nominal species Trichechus Manatus australis, T. Dugong, and T. Manatus borealis, but the implied new combinations are not printed. Halicore is preferred to the name Dugong because the latter is not of Greek or Latin origin (xvii). Rytina is an incorrect transliteration of the Greek but is nonetheless the "correct original spelling" of the generic name.