. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 1S2 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY The size of the corpus allatum of Gelastocoris shows consider- able individual variation. In the 7 sectioned adults in which it was distinct, the approximate diameter of the gland ranged from 75 [J. to 100 \x. It is composed of closely packed cells with roughly spherical nuclei whose diameter ranges from three to six \). (Fig. 26). These nuclei stain deeply, being rich in chro- matin. The light-staining cytoplasm is sparse and homogeneous; very faint cell membranes could be
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 1S2 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY The size of the corpus allatum of Gelastocoris shows consider- able individual variation. In the 7 sectioned adults in which it was distinct, the approximate diameter of the gland ranged from 75 [J. to 100 \x. It is composed of closely packed cells with roughly spherical nuclei whose diameter ranges from three to six \). (Fig. 26). These nuclei stain deeply, being rich in chro- matin. The light-staining cytoplasm is sparse and homogeneous; very faint cell membranes could be distinguished in some prep- arations but not in others. Graichen (1936) noted very faint cell CA fgl#f|\ «» -HI9 ,x-^^@£ll§3^// My JBs P) \K \ &\P" TR G HI8 TL Fig. 26. Transverse section through the brain of a newly-moulted adult Gelastocoris, taken at the level of the tritoeerebrum, corpus allatum, and corpora cardiaca. The gut and muscles are unstippled. 320 membranes in the corpora allata of Nepa, and Pflugfelder (1936- 37) observed them in some Geocorisae, although Nayar (1956b) reported a syncytial condition in the corpus allatum of Iphita. It may be that the presence or absence of cell membranes in this gland varies with its secretory activity, as Wigglesworth (1934) has reported for Rkodnius. The corpora cardiaca (CC) lie on either side of the gut, at the point where the latter emerges from the brain; they are located between the dorsal (II19) and ventral (H18) post- pharyngeal dilator muscles (Fig. 24). These glands are roughly. 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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