. The Protozoa. Protozoa. 196 THE PROTOZOA are all hollow. The function of the endoplasm, according to Biitschli, differs in the styliform and the capitate tentacles. In the latter, the prey is retained by the sucking disk at the extremity while the endo- plasm within the tube meantime works up and down like a pump- piston, and a vacuum being thus formed, the cuticle of the prey is burst, and the fluid endoplasm flows down the tentacle canal to the endoplasm of the captor, where it is digested. Such an explanation of the action of these tentacles is regarded by most observers as extremely doub
. The Protozoa. Protozoa. 196 THE PROTOZOA are all hollow. The function of the endoplasm, according to Biitschli, differs in the styliform and the capitate tentacles. In the latter, the prey is retained by the sucking disk at the extremity while the endo- plasm within the tube meantime works up and down like a pump- piston, and a vacuum being thus formed, the cuticle of the prey is burst, and the fluid endoplasm flows down the tentacle canal to the endoplasm of the captor, where it is digested. Such an explanation of the action of these tentacles is regarded by most observers as extremely doubtful. Delage finds no motion in the endoplasm during feeding, save in the rhythmic pulsations of the contractile vacuole, an organoid which Eismond ('90) believed is the cause of the suction. The excretion of water from the vacuole, he argued, creates a semi-vacuum in the protoplasm, and the pressure. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Calkins, Gary N. (Gary Nathan), b. 1869. New York, The Macmillan company; London, Mamcillan & co. , ltd.
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