. A text-book of invertebrate morphology. Invertebrates. 630 INVEBTEBBATE MOBPHOLOaT. separating, rise through the thick test of the parent (Fig. 287, 0) until they reach the surface, and develop to complete in- dividuals, in which the process may be repeated. Amarcedum thus forms massive colonies consisting of a number of quite separate individuals all imbedded in a common test, and all directly or indirectly the result of the budding of a single in- dividual developed by the sexual method. In other forms, however, the stolon is practically sup- pressed and the buds arise directly from the bo
. A text-book of invertebrate morphology. Invertebrates. 630 INVEBTEBBATE MOBPHOLOaT. separating, rise through the thick test of the parent (Fig. 287, 0) until they reach the surface, and develop to complete in- dividuals, in which the process may be repeated. Amarcedum thus forms massive colonies consisting of a number of quite separate individuals all imbedded in a common test, and all directly or indirectly the result of the budding of a single in- dividual developed by the sexual method. In other forms, however, the stolon is practically sup- pressed and the buds arise directly from the body of the b. Fig. 288,—A System of Six Individuals from a Compound Colony of Botryllv^ (after Oka). a = adult individual. ecp = ectodermal processes extending 6 = bud. into test from each individual. cl = common cloaca. m = mouth of one of the individuals. parent. This is the case in Didemnum and Tridemnum, for instance, peculiar complications being also introduced into the process. In the latter form the daughter individual arises as two buds which later fuse. One arises from the upper end of the oesophagus and gives rise to the intestine and neigh- boring organs in the bud, while the other, arising from the branchial sac, gives rise to that structure, the atrium, and terminal portion of intestine. Usually the two buds arise simultaneously, but occasionally one may fail, the result be- ing the production of half individuals which remain united with the parent, producing double monsters ; and since either. 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 McMurrich, J. Playfair (James Playfair), 1859-1939. New York, H. Holt and Company
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