Elementary text-book of zoology, tr Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote elementarytextbo01clau Year: 1892-1893 184 J'BOTOZOA. Order 1.—FORAMINIFERA.* Rhizopoda, either naked or with a shell, the shell almost invariably calcareous and usually pierced with fine pores for the exit of the pseudopodia. Only in rare cases, for instance Nonionina and Polymorphina, is the shell substance of a silicious nature; in all other forms it is Fio. 123.— ttnera, with network of pseudopodia (after IT. Schultzc). membranous or consists of a ca
Elementary text-book of zoology, tr Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote elementarytextbo01clau Year: 1892-1893 184 J'BOTOZOA. Order 1.—FORAMINIFERA.* Rhizopoda, either naked or with a shell, the shell almost invariably calcareous and usually pierced with fine pores for the exit of the pseudopodia. Only in rare cases, for instance Nonionina and Polymorphina, is the shell substance of a silicious nature; in all other forms it is Fio. 123.— ttnera, with network of pseudopodia (after IT. Schultzc). membranous or consists of a calcareous deposit in a basis of organic matter. The shell is either a simple chamber, usually provided with a large opening, or is many chambered, that is, is composed of numerous chambers arranged upon one another according to definite laws. The spaces of these chambers communicate by means of narrow * Besides D'Orbigny, Max Schultze, 1. c., compare W. C. Williamson, ' On the recent Foraminifera of Great Britain,' London, 1858. Carpenter. 'Intridur- tion to the Study of the Foraminifera,' London. 18G2. Rvuss, 'Eutwurf eiuer system. Zusammeustellung der Foraminiferen,' Wien, 1S61.
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