. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 336 BULLETIN OF THE to accept the view which has been generally held since the time of Chamisso's famous paper ; that is, that Salpa presents an instance of " alternation of ; This view, in its most modern form, may be stated as follows : " It is now a settled fact that the repro- ductive organs are found only in the aggregated individuals of Salpa, while the solitary individuals, which are produced from the fertilized eggs have, in place of sexual organs, a bud-stolon, and reproduce in the
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 336 BULLETIN OF THE to accept the view which has been generally held since the time of Chamisso's famous paper ; that is, that Salpa presents an instance of " alternation of ; This view, in its most modern form, may be stated as follows : " It is now a settled fact that the repro- ductive organs are found only in the aggregated individuals of Salpa, while the solitary individuals, which are produced from the fertilized eggs have, in place of sexual organs, a bud-stolon, and reproduce in the asexual manner exclusively, by the formation of buds. Male and female organs are, so far as we yet know, united in the Salprj in one individual. The Salpce are ; (Leuckart. Sulpa und Verwandten, pp. 46 and 47.) When, however, we trace backward the history of one of the individuals which compose a chain, and find that the egg is present at all stages of growth, and has exactly the same size and appearance as at the time when it is impregnated ; when we find one organ after another disappearing until at last we have noth- ing but a faint constriction in the wall of the tube, indicating what is to become the animal, the conclusion seems irresistible, that the animal, which as yet has no existence, cannot be the parent of the egg which is already fully formed.* Fig. Seven zooids from a fully developed chain, immediately before its discharge from the body of the female ; the references are the same as in Fig. 33. * The development of 'the eggs in the body of one zooid, and their passage into the body of another produced by budding from the first is not unusual among the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : Th
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