. The algae. Algae. 12-40 12-50 12-53 1-0 Fig. 9 Volvox capensis and V. rousseletii. A-J, stages in the inver- sion of a daughter colony. A, denting begins. C, dents smooth out. D, colony round again. E, 'hour-glass' stage. F, posterior half contracts. G, infolding begins. H, infolding complete. I, posterior half emerges through phialopore. J, flask stage begins. K, flask stage ends. L, inversion complete. (All x 150 approx.) (After Pocock.) gested that the volvocine colony has arisen at least twice in the course of evolution, once from a Sphaerella and once from a Chlamyd
. The algae. Algae. 12-40 12-50 12-53 1-0 Fig. 9 Volvox capensis and V. rousseletii. A-J, stages in the inver- sion of a daughter colony. A, denting begins. C, dents smooth out. D, colony round again. E, 'hour-glass' stage. F, posterior half contracts. G, infolding begins. H, infolding complete. I, posterior half emerges through phialopore. J, flask stage begins. K, flask stage ends. L, inversion complete. (All x 150 approx.) (After Pocock.) gested that the volvocine colony has arisen at least twice in the course of evolution, once from a Sphaerella and once from a Chlamydomonas ancestry. Some evidence in support of this view has recently come to hand from a study of chromosome numbers (see below). On the other hand, the great uniformity of their sexual reproduction can be employed as an argument against such a di- phyletic origin. 30. 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 Chapman, V. J. (Valentine Jackson), 1910-. London, Macmillan; New York, St. Martin's Press
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