Elementary text-book of zoology, general Elementary text-book of zoology, general part and special part: protozoa to insecta elementarytextbo00clau Year: 1892 RIIIZOPODA. 181 by holes, to shelter and protect the body {Foraminifera, 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 movemente of the cilia, hairs, bristles, etc., which it possesses. The soHd nourishing matter is taken in through a mouth, and the remainder, after digestion, passes out through an anal aperture. CLASS I.—RHIZOPODA.* Pro
Elementary text-book of zoology, general Elementary text-book of zoology, general part and special part: protozoa to insecta elementarytextbo00clau Year: 1892 RIIIZOPODA. 181 by holes, to shelter and protect the body {Foraminifera, 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 movemente of the cilia, hairs, bristles, etc., which it possesses. The soHd 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 Pohjthalamia, 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- ment, contracts slowly and sends out at the same time fine thread-like rays (fig. 120), for the most part of a semi-fluid consistency [pseudojyodia); 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' (^Comj)tes rendns, 1835). Ehrenberg, ' Uber noch jetzt zahlreich lebende Thierarten der Kreidebildung und den Organismus der Polythalamien' {Ahhandlung der Akad. zu Berlin, 1839). Max Sigm. Schultze, 'Uber den Organismus der Polythalamien' (Leipzicr. 1854). Joh. Miiller, ' Uber die Thalassicolen, Polycystinen und Acan- thoraetren' (1858). E. Haeckel, ' Die Radiolarien' (Eine Monographic. Berlin, 1862). Fig. 120.—Optical section through portion of the sarccde body of Actinoaphaerium Eichhornii (after Hertwig and Lesser). N, nuclei in the endosarc, from which the vacuolated ectoaarc is clearly dis- tinguishable. In the centre of
Size: 1474px × 1357px
Photo credit: © Bookworm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage
