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Then, too, the Philozoon is subservient in another way to the nutritive function of the animal, for after its short life it dies and is digested; the yellow bodies supposed by various observers to be developing cells being nothing but dead algae in progress of solution and disappearance.
Thus, then, the chemical composition, as well as the structure and mode of division of these yellow cells, are those of unicellular algae, and I accordingly propose the generic name of Philozoon, and distinguish four species, differing slightly in size, color, mode of division, behavior with reagents, etc., for which the name of P. radiolarum, P. siphonophorum, P. actiniarum, and P. medusarum, according to their habitat, may be conveniently adopted.
The red variety is absolutely free from Philozoon, which could not exist in such deeply colored light, while the white variety, which I am inclined to think is usually the larger and better grown of the two, is perfectly crammed.
Nor do the services of the Philozoon end here; for during sunlight it is constantly evolving nascent oxygen directly into the surrounding animal protoplasm, and thus we have actually foreign chlorophyl performing the respiratory function of native haemoglobin!
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