The purpose of this paper is to demonstrate the stereoscopic structure of the papillary body of the proventricular mucous membrane in the sheep and the goat. This papillary body hitherto has only been known from histological sections. -Tissue specimen were taken from freshly killed animals and put into 0.3 O! o acetic acid, in order t o let the epithelium peal off. T h e investigation was carried out with the scanning electronmicroscope.At places where the mucous membrane has a smooth surface, the papillary body consists of slender papillae and in the other proventricular portions it consists of cone-, crest-or comblike propria elevations.