Abstract
Having been engaged at intervals during the last few years in studying from a physiological point of view the coagulation of crustacean blood—Tait (08), (10, A and B), (11)—and finding more variation in this regard in different Crustacea than has hitherto been recognized, it suggested itself to me to inquire if the observed differences are correlated with any special physiological peculiarities, and, further, if they depend in marked degree on phylogenetic relationship. It is not a simple matter to settle either of these questions, and I make no pretence to have done so. At the same time, I have thought it worth while to put my observations on record, in the hope that the matter may thus sooner arrive at a satisfactory settlement.

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