. Bulletin - United States National Museum. Science. 212 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. ectodermal. In most other respects the development of the organs is similar in the primary and secondary ascidiozooids. The growth and formation of the colony has been deciphered by Seel- iger and Neumann for Pyrosoma aherniosum, and to some extent for other species, as P. verticillatum. Each primary ascidiozooid gives rise first to a single bud, and these buds move around to the left and occupy positions dorsal to the interspaces between the parent zooids (No. 1, fig. 8). The next set of buds
. Bulletin - United States National Museum. Science. 212 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. ectodermal. In most other respects the development of the organs is similar in the primary and secondary ascidiozooids. The growth and formation of the colony has been deciphered by Seel- iger and Neumann for Pyrosoma aherniosum, and to some extent for other species, as P. verticillatum. Each primary ascidiozooid gives rise first to a single bud, and these buds move around to the left and occupy positions dorsal to the interspaces between the parent zooids (No. 1, fig. 8). The next set of buds pro- duced by the primary ascidiozooids again move dorsally, this time occu- pying positions directly above the parent zooids, and in the same whorl with the first formed four (No. 2, fig. 9). Thus far two rings, or tiers, of zooids are established; an older one of four primary ascidiozooids,. Fig. 8.—A diagram of an end view OF A COLONY OF PYROSOMA AHER- NIOSUM, "WITH THE ZOSlDS PROJECTED ONTO ONE 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 United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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