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1 College of Fisheries, 204 Fisheries, University of Washington, Seattle, Washington
The morphology and known functions of leucocytes have been tabulated and compared for most invertebrate phyla. The leucocytes of the Manila clam are similar in form to molluscan leucocytes described by other investigators. Two general types were seen. One was a hyaline leucocyte ("leucocyte") and the other a granular leucocyte ("granulocyte"). Cells in these categories showed extreme variations in size and staining characteristics. A decrease in nuclear size often was correlated with an increase in nuclear heterochromasia and eccentricity and cytoplasmic granularity. The average cell count for all circulating leucocytes was 1650 ± 180 per mm3.
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