. The biology of the Protozoa. Protozoa; Protozoa. C D Fig. 163.—Tentacles of Infusoria. A, Mesodinium pulcx, with four oral tentacles for adhering; B, Podophrya fixa: C, D, tentacles of EpheloticUe. {A, C, D, from Cal- kins; B, Original.) A well-defined mouth is present in almost all ciliates (absent in an entire group, only in Opalinidtv. Tn gimnostomata it is closed save at times of food ingestion; in all other groups it is permanently open. In these latter cases the form of the mouth varies from cir- cular to elliptical, crescentic or triangular openings and in the majority of cases leads

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. The biology of the Protozoa. Protozoa; Protozoa. C D Fig. 163.—Tentacles of Infusoria. A, Mesodinium pulcx, with four oral tentacles for adhering; B, Podophrya fixa: C, D, tentacles of EpheloticUe. {A, C, D, from Cal- kins; B, Original.) A well-defined mouth is present in almost all ciliates (absent in an entire group, only in Opalinidtv. Tn gimnostomata it is closed save at times of food ingestion; in all other groups it is permanently open. In these latter cases the form of the mouth varies from cir- cular to elliptical, crescentic or triangular openings and in the majority of cases leads into a ciliated gullet. Such constant feeders are limited to a bacterial diet and other minute food substances while the gvnmostomes, bv reason of the distensibility of the oral. 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. Philadelphia, New York, Lea & Febiger

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Keywords: ., bookauthorcalkinsgaryngarynatha, bookcentury1900, bookdecade1920