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The general anatomy of the adultLucifer has been satisfactorily made known by the observations of Souleyet, Huxley, Hensen, Dana, Semper, Claus, Dohrn, and Faxon; and the only facts which I have to add relate to the structure of the reproductive organs. The earliest recorded observations upon this subject are by Dana (‘United States Exploring Expedition during the Years 1838, 1839, 1840, 1841, and 1842ʼ under the Command of Charles Wilkes, U. S. N., vol. xiii., part 1). In plate 44, fig. 9,b, h, andm" , he gives a very correct representation of the male reproductive organs and spermatophore of an adult male specimen ofLucifer (acestra ); but his description of these figures (p. 670) shows that he was completely at a loss for an interpretation of the parts which he has represented, and had no idea of their true function.

II. Lucifer: A study in morphology