. Biological series. Biology. 358 Transactions of the Canadian Institute [vol. IX In galls other than the Cynipidae, the only cytological phenomena that presented unusual features were found in the orders Diptera and Lepidoptera. An unusual type of cell division was observed in the cortex and epidermis of Neolasioptera perfoliata Felt (Text Fig. 7) and in the cortex of Gnorimoschema gallceasterella Kellicott and Stagmatophora ceanothiella Cosens. This has been already referred to in the descriptive part of the paper and only the main features will be noted here. The mother cells produce from 2
. Biological series. Biology. 358 Transactions of the Canadian Institute [vol. IX In galls other than the Cynipidae, the only cytological phenomena that presented unusual features were found in the orders Diptera and Lepidoptera. An unusual type of cell division was observed in the cortex and epidermis of Neolasioptera perfoliata Felt (Text Fig. 7) and in the cortex of Gnorimoschema gallceasterella Kellicott and Stagmatophora ceanothiella Cosens. This has been already referred to in the descriptive part of the paper and only the main features will be noted here. The mother cells produce from 2 to 5 daughter cells and these remain in groups that are easily recognizable. The elongated nuclei are found in contact with the septating walls but not exactly opposite each other. In the Dipterous genus Neolasioptera this was the only form of cell division that occurred in the gall, but in the Lepidopterous genera it was found only in a limited area of the abnormal 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 University of Toronto; Toronto, Ont. University. University of Toronto studies. Biological series. Toronto University Press [etc. ]
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