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Quarterly Journal of Microscopical Science, Vol s3-101, 9-18, Copyright © 1960 by Company of Biologists

An Anatomical, Histological, and Histochemical Study of the Gut of the Brachiopod, Crania Anomala

S. H. CHUANG 1

1 Cytological Laboratory, Department of Zoology, University Museum, Oxford, present address, University of Malaya, Singapore

The gut of Crania anomala has been studied morphologically and histochemically. It is attached to the body-wall by dorsal and ventral mesenteries with the exception of the posterior part of the intestine, which lies free in the right half of the visceral cavity. The gut-wall consists of an inner columnar epithelium, a connective-tissue stroma, and an investing squamous mesothelium. The columnar epithelium comprises ordinary epithelial cells, some goblet cells, and occasional phagocytes.

The cytoplasmic inclusions of the gut epithelium include pigment granules, glycogen granules, lipochondria, and goblet-cell globules. The lipochondria contain a phospholipid. The goblet-cell globules contain a muco- or glycoprotein, and are extruded into the lumen of the gut presumably for lubrication and for the entanglement of food particles. Extranuclear DNA, presumably originating from the nucleus, occurs in the cytoplasm of the ordinary epithelial cells in the digestive diverticula.






© The Company of Biologists Ltd 1960