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 JUIIZOPODA. 181 by holes, to shelter and protect the body (Foraminiferd, Radiolaria). In the Infusoria, the sarcode body is bounded by an external mem- brane, and is capable of quick and varied locomotion by means of the movements of the cilia, hairs, bristles, etc., which it possesses. The solid nourishing matter is taken in through a mouth, and the remainder, after digestion, passes out through an anal aperture. CLAS
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 JUIIZOPODA. 181 by holes, to shelter and protect the body (Foraminiferd, Radiolaria). In the Infusoria, the sarcode body is bounded by an external mem- brane, and is capable of quick and varied locomotion by means of the movements of the cilia, hairs, bristles, etc., which it possesses. The solid nourishing matter is taken in through a mouth, and the remainder, after digestion, passes out through an anal aperture. CLASS I.— RHIZOPODA.* Protozoa without external investing membrane, the parenchyma of which protrudes and retracts processes ; as a rule, a calcareous shell or silicious skeleton is secreted. The body-substance of these animals, the shells of which were described as Foraminifera or Polythalamia, long before their living contents were known, consists of sarcode, and is without any boundary mem- brane. The body- substance, which is richly granulated and contains pig- nient, contracts slowly and sends out at the same time fine thread -like rays (fi^ 120) for the most part of a semi-fluid cons is te ncy (pseudopodia} ; and these serve not only as a means of movement but also for the reception of nourishment. The pseudopodia may, how- * Dujardin, 'Observations sur les Rhizopodes' (Comptes rendits, 1835). Ehrenberg. ' Tiber noch jetzt zahlreich lebende Thierarten der Kreidebildung und den Organisms der Polythalamien' (Abhandlung der AJtad. ru Berlin^ 1839). Max Sigin. Schultze, ' Uber den Organismus der Polythalamien' (Leipzig, 1854). Joh. Miiller. ' Uber die Thalassicolen, Polyoystinen und Acan- thometfen' (1858). E. Haeckel, 'Die Radiokrien' (Eine Monographic. Berlin, 1 862). Flr' 120.— Optical section through portion of the sarccde body of Actinosphaerium Eichhornii (after Hertwig and Leaser). N, nuclei jn t,ne endosarc, from which the vacuolated ectoaarc ifl clearly dis- tingu
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