. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 194 T. M. SONNEBORN. FIGS. 1-16. The normal division cycle and the origin of doubles from chains and from " ; Figs. 1, 4, 5, 6, 7, 8, 11, 12, 13, and 14 from cam- era lucida drawings; Figs. 2, 3, 15, and 16 from notebook sketches; Figs. 9 and 10 diagrammatic. Figs. 1 and 11, normal adults; Fig. 2, normal fission nearly com- pleted; Fig. 3, fission just completed; Fig. 4, recent products of fission that have already attained adult form; Fig. 5, chains of two parts, each part having the elongated ad
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 194 T. M. SONNEBORN. FIGS. 1-16. The normal division cycle and the origin of doubles from chains and from " ; Figs. 1, 4, 5, 6, 7, 8, 11, 12, 13, and 14 from cam- era lucida drawings; Figs. 2, 3, 15, and 16 from notebook sketches; Figs. 9 and 10 diagrammatic. Figs. 1 and 11, normal adults; Fig. 2, normal fission nearly com- pleted; Fig. 3, fission just completed; Fig. 4, recent products of fission that have already attained adult form; Fig. 5, chains of two parts, each part having the elongated adult form; Fig. 6, chain with the two parts united over a wider region and forming an obtuse angle; Fig. 7, chain with the two parts united over a large part of their aboral surfaces and forming an acute angle; Fig. 8, heteropolar dou- ble; Fig. 9, multiple monster containing a projection (a) with one set of structures and another projection (b) with two sets of structures lying parallel and having the same polarity; Fig. 10, small multiple monster; Fig. 12, homopolar double; Fig. 13, homopolar double undergoing fission; Fig. 14, homopolar doubles produced by fission of a homopolar double; Fig. 15, " pseudo-conj ugant" normal singles united laterally except at anterior end; Fig. 16, " pseudo-conj ugant" normal singles united laterally in mid-region. vidual with normal structure. Rarely, a projection (Fig. 9b) contained two sets of structures with the same polarity; fission across such a projection would yield a homopolar double. Homopolar doubles are of particular importance, from the point of view of the present paper, because they gave rise by fissions to biotypes. 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laborat
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
