. The physiology of the Invertebrata. yi^j ?.. Fig. 2.—Various Pkotozoa. A = Gregavina. B = Amceba. C = Magosphaera. D = Actinophrys. E = Actinosphserium. F = Part of E highly magnified. V = contractile vacuole, n = nucleus. structure is concerned, the Ghegarina ranks higher than theAmceba. (b) The Amceba.—In the Protoplasta, to which the Amosld/belongs, we have a distinct advance in the mechanism of PHYSIOLOGY OF THE INVERTEBRATA. 25 digestion, for in this order one beholds the very birth of thedigestive function. The Amoeba (Fig. 2, b) seizes its food by extending someportion of its cell. Th
. The physiology of the Invertebrata. yi^j ?.. Fig. 2.—Various Pkotozoa. A = Gregavina. B = Amceba. C = Magosphaera. D = Actinophrys. E = Actinosphserium. F = Part of E highly magnified. V = contractile vacuole, n = nucleus. structure is concerned, the Ghegarina ranks higher than theAmceba. (b) The Amceba.—In the Protoplasta, to which the Amosld/belongs, we have a distinct advance in the mechanism of PHYSIOLOGY OF THE INVERTEBRATA. 25 digestion, for in this order one beholds the very birth of thedigestive function. The Amoeba (Fig. 2, b) seizes its food by extending someportion of its cell. The extended portion is known as apseudopodium. The pseudopodium, after seizing the particlesof food, retract, and the food becomes incorporated in theinterior of the cell, which has the property of digesting andabsorbing the nutritive portion of the food and ejecting thenon-digested portion. In some forms of the Protoplasta pseudopodia are extendedfrom any part of the protoplasmic cell; whereas in others(, PampJiagtis) these non-differ
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectinverte, bookyear1892
