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An illustration of an amoeba: n, nucleus.

Amoeba

An illustration of an amoeba: n, nucleus.

An illustration of an amoeba: n, nucleus.

Amoeba

An illustration of an amoeba: n, nucleus.

An illustration of an amoeba: n, nucleus.

Amoeba

An illustration of an amoeba: n, nucleus.

An illustration of an amoeba: n, nucleus; cv, contractile vacuole.

Amoeba

An illustration of an amoeba: n, nucleus; cv, contractile vacuole.

An illustration of the adult amoeboid Lymphosporidium truttae, which was the cause of the brook-trout epidemic of the 1800s.

Lymphosporidium

An illustration of the adult amoeboid Lymphosporidium truttae, which was the cause of the brook-trout…

An illustration of Lymphosporidium truttae in the blood cell of a brook trout, which was the cause of the brook-trout epidemic of the 1800s.

Lymphosporidium in Blood Cell

An illustration of Lymphosporidium truttae in the blood cell of a brook trout, which was the cause of…

An illustration of Lymphosporidium truttae in the blood cell of a brook trout with numerous sporoblasts, which was the cause of the brook-trout epidemic of the 1800s.

Lymphosporidium in Blood Cell

An illustration of Lymphosporidium truttae in the blood cell of a brook trout with numerous sporoblasts,…

"Paramoecium caudatum. A, the living animal from the ventral aspect; B, the same in optical section: the arrow shows the course taken by food-particles; C, a specimen which has discharged its trichocysts; D, diagram of binary fission; buc. gr, buccal groove; cort, cortex; cu, cuticle; c. vac, vontractile vacuole; f. vac food vacuole; gul, gullet; med, medulla; nu, meganucleus; pa. nu, micronucleus; trch, trichocysts." -Parker, 1900

Paramoecium Caudatum

"Paramoecium caudatum. A, the living animal from the ventral aspect; B, the same in optical section:…