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The classical volume of Dr. W. B. Carpenter, written in conjunction with Professors Kitchen Parker and Rupert Jones, is still an exceedingly valuable book for workers in this special branch of study, for it contains the pioneer work of those authors on the morphology and microscopic shell structure of Foraminifera." The monographs of Drs. W. C. Williamson ? and H. B. Brady 3 are also indispensable as works of reference. But these and others more recently published are voluminous and not always easily accessible to the student; whilst the increasingly large number of smaller works on the subject, written by Continental, English, and other authors, which have from time to time appeared in the various publications of Scientific Societies and in periodicals and journals, are quite outside the scope of the general student's reading.'
1 Introduction to the Study of the Foraminifera. Ray Society publication. London, 1862.
? The Recent Foraminifera of Great Britain. Ray Society's publication. London, 1858.
3 Report on the Foraminifera : H.M.S. Challenger,' Zoology, vol. ix. 1884.
4 For the literature on Foranıinifera to 1888 consult C. D. Sherborn's Bibliography of the Foraminifera, London, 1888, and the supplemental work, to 1898, by Paul Tutkowski, Cracow, 1898.
XVI. THE FAMILY NUMMULINIDÆ