Published online by Cambridge University Press: 11 May 2009
The hypobranchial gland ofMorula gramilata (Duclos) has been morphologically and histochemically characterized. The marginal zones of the gland have mucocytes and eosinophil cells while the median region has in addition ciliated cells and gland cells. Neurosensory cells are also present. Two types of mucous cells have been identified. Type I secrete a diastase-resistant, neutral mucopolysaccharide, while type II secrete PAS unreactive, strongly acidic and highly sulphated mucins. Exposure to low temperatures, ultraviolet rays and irritants resulted in the production of a purple dye.