. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. DAVENPOKT: PROCESSES CONCERNED IN ONTOGENY. 195 Sacculina, where the thorax and abdomen are thrown ofi", the head alone persisting to complete the Fig. 30. 6. Another division process is that of splitting of the mass. This is illnstrated by tlie case of the optic mass of the lobster (Figure 30), wliich splits into an outer and an inner part. Com- pare the origin of the nervous system of Peripatus, K. &: H., Fig. 442, B. 7. Under the second head, fusion of contiguous masses, we may place such c
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. DAVENPOKT: PROCESSES CONCERNED IN ONTOGENY. 195 Sacculina, where the thorax and abdomen are thrown ofi", the head alone persisting to complete the Fig. 30. 6. Another division process is that of splitting of the mass. This is illnstrated by tlie case of the optic mass of the lobster (Figure 30), wliich splits into an outer and an inner part. Com- pare the origin of the nervous system of Peripatus, K. &: H., Fig. 442, B. 7. Under the second head, fusion of contiguous masses, we may place such cases as that of the union of indepen- dently arisen ganglionic masses, such as Mf)rgan describes for the Pantopod, Pal- lene (Figure 31). Fig. 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. : The Museum
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