. Bulletin. Natural history; Natuurlijke historie. 10m Text-fig. 4. Special cell types and coiled material present in Thalysias juniperina. A. Cell type S. Two types of inclusions are present: basophilic inclusions (black) and Mallory-positive inclu- sions (white), n = nucleus. B. Globoferous cells: above, type I and below, type II. Both types contain basophilic inclusions (black) and at least one larger Mallory-positive inclusion (white), n = nucleus. C. Toxoblast containing a toxa. D. Cell type G-R containing basophilic granules (black) and a single rod-shaped Mallory-positive inclusion. E.
. Bulletin. Natural history; Natuurlijke historie. 10m Text-fig. 4. Special cell types and coiled material present in Thalysias juniperina. A. Cell type S. Two types of inclusions are present: basophilic inclusions (black) and Mallory-positive inclu- sions (white), n = nucleus. B. Globoferous cells: above, type I and below, type II. Both types contain basophilic inclusions (black) and at least one larger Mallory-positive inclusion (white), n = nucleus. C. Toxoblast containing a toxa. D. Cell type G-R containing basophilic granules (black) and a single rod-shaped Mallory-positive inclusion. E. Coiled material present in the mesenchyme. Lower scale for A, B, C, D. been observed to undergo mitosis. They contain in their cytoplasm approxi- mately 20 spherical inclusions, some of which are basophilic and others of which stain light blue in Mallory solution II. Some cells have a predominance of basophilic inclusions but others have a predominance of Mallory-positive in- clusions; intermediate types have some of both types of inclusions. All of these cells contain anucleolate nuclei which appear to be crenated or shrunken. This appearance is due to an irregularity of the nuclear membrane—usually to the pushing in of this membrane on one side (Text-fig. 4, A). These cells have a uni- form spherical shape. Globoferous cells, type I These cells are morphologically similar to globoferous cells as described in Microciona (Text-fig. 4, B). They are, however, very rare in adult sections of T. juniperina. In the outgrowth region they occur almost exclusively in the up- per epidermis and to a lesser degree in the undifferentiated areas. These cells have not been observed in living material, and their cytochemical characteristics have not been determined because of their scarcity. They are elongate cells and contain anucleolate nuclei which appear crenated. Within the cytoplasm are small basophilic granules; in addition, larger spherical inclusions which stain light blue in Mallor
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