XXV. Researches on Foraminifera. —fourth and concluding series

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Abstract
172. I have now to bring to a close my account of the structure of those typical forms of Foraminifera which it has been my object to elucidate, by a description of four remarkable generic types; of which the first, Polystomella , has long been known, but has been hitherto very imperfectly comprehended; the second, Calcarina , has never been carefully studied; the third, Tinoporus , has only been very imperfectly known in one of its forms; and the fourth, Carpenteria , is altogether new. Each of these will be found to present features of interest peculiarly its own; — Polystomella being remarkable for the very symmetrical distribution of its canal-system, whose existence and whose relation to the multiple fossæ upon its surface have hitherto been altogether overlooked; — Calcarina being distinguished by the extraordinary development of its "intermediate" or rather "supplemental skeleton," and by the amplification of the canal-system for its nutrition; — Tinoporus presenting us with a type of structure that is intermediate between the Rotaline group (to which it is allied in the character of its individual chambers) and the Orbitoline (to which it approximates in its mode of growth), and that helps us greatly in the interpretation of the structure of the fossil Orbitiodes ; —and, lastly, Carpenteria furnishing us with a connecting link of the most striking significance between Foraminifera and Sponges.

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