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The material for the studies was obtained from fragments of the brain stem, including the pons Varoli, of 2- and 6-year old red deer and of 2- and 3-year old female roe. The fixed material was mounted in paraffin and cut transversely into 15 micron sections, of which every fifth was examined. Preparations of the alcohol-fixed brain of one red deer and one roe were stained with methylene blue according to Nissl's modified method. Sections of the formalin-fixed brain of the other red deer and roe were stained according to the method of Klüver-Barrera with 0.1% solution of Luxor Fast Blue. Part III describes the structure and localization of the nerve nuclei of the portion of the brain stem under consideration. The following nuclei in the pons Varoli of the red deer and roe were described: nucl. medianus pontis, nucl. paramedianus pontis, nucl. ventralis pontis, nucl. lateralis pontis, nucl. dorso-lateralis pontis, nucl. peduncularis pontis. The nuclei, and especially in the central portion of the pons Varoli, are well developed in the species under discussion. With regard to the tegmentum pontis of the red deer and roe, a description of the structure and topography of the following nuclei is given: nucl. dorsalis tegmenti pontis, nucl. latero-dorsalis tegmenti pontis, nucl. dorsalis raphe, nucl. loci coerulei, nucl. reticularis dorsalis tegmenti pontis, nucl. reticularis ventro-lateralis tegmenti pontis, and nucl. reticularis ventro-medialis tegmenti pontis. The structure and localization of the nuclei of the tegmentum pontis are similar in both species, but the two first nuclei are much better developed in the roe than in the deer. The nucleus loci coeruliei could not be found in the roe.