. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Chr - Nuc Vac ypH» ' mi li • *>.a *f. ^^fi. FIGURE 18. Schematic diagram of Lcpas tnutiifcru cement gland. Erg, ergastoplasm; CT, connective tissue membrane ; Chr, chromatin ; Nuc, nucleolus; Vac, vacuole. along its entire length to the base. The cement glands of Conchoderma, another pedunculate barnacle, were found by Krohn (1859) to be situated in the mantle. The distribution of the cement glands also varies with the species in the Balanidae (Lacombe and Liguori, unpublished results). For example, the cement glands of B
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Chr - Nuc Vac ypH» ' mi li • *>.a *f. ^^fi. FIGURE 18. Schematic diagram of Lcpas tnutiifcru cement gland. Erg, ergastoplasm; CT, connective tissue membrane ; Chr, chromatin ; Nuc, nucleolus; Vac, vacuole. along its entire length to the base. The cement glands of Conchoderma, another pedunculate barnacle, were found by Krohn (1859) to be situated in the mantle. The distribution of the cement glands also varies with the species in the Balanidae (Lacombe and Liguori, unpublished results). For example, the cement glands of Balanus tiiitinnabiilnui are distributed among the interfollicular spaces of the ovaries and the connective tissue surrounding the ovarian follicles. In related species such as Balanus nubilis, the cement glands and their canals are not closely arranged in the interfollicular area. Basic cytological differences in the cement gland cells of Lcpas anatijcra and Balanus tintinnabulum, indicate differences in the secretory mechanism. The large numbers of nucleoli, the presence of a zone of ergastoplasm and vacuoles distributed throughout the cytoplasm of the glands of Lcpas anatijcra, are characteristics of cells having a high level of metabolic activity. In this case, the glands correspond to the apocrine type in which secretory function is accompanied by a loss of some cytoplasm. The histological evidence indicates that the cellular secretion is transported to the intracellular canals in vacuoles formed in the cytoplasm. The walls of the intracellular canals, collecting canals and secondary canals have been found to be syncytial, a property which possibly enhances the transport of the soluble secretion across the cell membranes. The cement glands of Balanus tintinnabulum also have many nucleoli. However, they correspond to the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance o
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
