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This paper is supplemental to the series of Memoirs formerly presented by the author on the structure of certain of the higher forms of the group of Foraminifera; in which he laid down the new principles of classification afterwards worked out by him, in conjunction with Messrs. W. K. Parker and T. Rupert Jones, in his “ Introduction to the Study of the Foraminifera;” and especially to the first of those memoirs (“ Phil. Trans.,” 1856), which consisted of a Monograph of the genusOrbitolite s, and of some general doctrines deduced from the study of it as to the Range of Variation in Species, a question which was much occupying the attention of philosophical naturalists. The subsequent publication of Mr. Darwin’s “ Origin of Species ” having led him unhesitatingly to adopt the principle of “Descent with Modification ” or “ Genetic Continuity,” he had applied it to the construction of a pedigree of theOrbitoline type ; between the smallest and simplest, and the largest and most complex of which, he had shown in his first memoir that such “ continuity ” could be clearly traced out.

Researches on the foraminifera. Supplemental memoir. On an abyssal type of the genus orbitolites ; a study in the theory of descent