. An introduction to zoology : for the use of high schools . of an excretory organ in these and other Sarcodina ai-e not all naked like the Amceba; in theorder to which it belongs (Rhizopoda,— called so on accountof the root-like branches of the pseudopodia in many),most of the forms secrete shells (Thalamophora), which maybe perforated all over for the escape of thread-like pseu-dopodia, or have merely one aperture through which similarprocesses escape or lobate ones like the Amoebas. The latteris the case in Arcella and Difflugia (Fig. 189, 2 and 3), whilein Euglypha and others
. An introduction to zoology : for the use of high schools . of an excretory organ in these and other Sarcodina ai-e not all naked like the Amceba; in theorder to which it belongs (Rhizopoda,— called so on accountof the root-like branches of the pseudopodia in many),most of the forms secrete shells (Thalamophora), which maybe perforated all over for the escape of thread-like pseu-dopodia, or have merely one aperture through which similarprocesses escape or lobate ones like the Amoebas. The latteris the case in Arcella and Difflugia (Fig. 189, 2 and 3), whilein Euglypha and others the are thread-like Fig. 189, 4),These are fresh-water forms, in which the shells are formed ofchitinous matter, or of foreign particles cemented together, but themarine forms—generally called Foraminifera—have for the mostpart a calcareous shell. This may be imperforate or perforate, andis generally composed of numerous chambers disposed in variouslyformed spirals (Fig. 190). Although of small size, these Foramini 254 HKJH school Fig. , Amoeba; 2, Areella; 3, Shell of Diffluffia ; 4, Englypha ; 5, Actino-phrys, a naked Heliozoon with axial filaments in the pseudopodia ; (3, Clathrulina, astalked shelle<l Heliozoon ; 7, (Jreyarinid, fioni an inseet-larva ; S, Encysted Gregarina,the contents transformed into spores ; 9, Spore from a Mvxosporidium. \ .??? rU ijijV ! j/.v f/ J —
Size: 1987px × 1257px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1889
