SUMMARY The blood volumes of 7 young northern elephant seals (Mirounga angustirostris) were analyzed by dilution of 131I-labeled human serum albumin. Microhematocrit values were also determined. Using these techniques, a mean blood volume of 216 ml./kg. and a mean packed cell volume of 64% were determined for these diving mammals.
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Simpson et al. (1970) studied this question.