Agranulocytes are non-granular white blood corpuscles. As the name itself indicates, leucocytes are without granules in their cytoplasm. They have a large nucleus. They are two kinds:
Lymphocytes:
They have a large round nucleus and cytoplasm from a non-granular rim around it. They from about 28% of total number of lymphocytes are produced in the spleen of a frog or in lymph nodes of mammals.
They are useful in the healing process of a wound.
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2) Monocytes or Mononuclear Leucocytes:
They are oval and irregularly shaped non-granular cells. They have a bean shaped nucleus and abundant in cytoplasm. Hey constitute 1 to 3% of the total leucocytes. Monocytes are phagocytic and are produced in spleen or lymph nodes.