The fine structure of coelomocytes of the sea urchin, Strongylocentrotus dröbachiensis (Müllier O.F.)

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Abstract
The fine structure of six different types of coelomocytes from Strongylocentrotus dröbachiensis (Müller), a sea urchin, is described. (1) Phagocytic leukocytes have either phagosomes of different sizes or large bladder-like, as well as veils of, cytoplasmic extensions. Syncytia are not observed under normal physiological conditions, although cell aggregation occurs without fusing of the plasma membranes. (2) Vibra-tile cells have a conventional flagellum and numerous mucopolysaccharide granules fill their cytoplasm. (3) The amoeboid red spherule cells contain typical echinochrome granules showing three structural components. (4) Colorless spherule cells contain numerous vacuole-like structures. (5) Small spherical cells are probably stem cells. (6) The granulocytes are few in number.

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