Abstract <p>The macromorphology of the olfactory organ was studied for goldenstriped soapfish <i>Grammists</i> <i>sexlineatus</i> and fire-tail devil <i>Labracinus cyclophthalmus.</i> In both species, the nostrils are separated by a narrow nasal bridge, and the nostril openings are approximately equal. The anterior nostril is a short, forward-slanting tube with a funneled opening; in the fire-tail devil, the tube base is situated in a small depression, the posterior nostril is a rounded funnel-shaped opening surrounded by a rim with a raised edge. In the fire-tail devil the anterior nostril opens and the posterior nostril closes, when the jaws open along with respiratory movements. In both species, the olfactory cavity is located under the nasal and lacrimal bones. At the cavity bottom, there is an olfactory rosette, elongated in the dorsoventral direction; it is formed by parallel, rostro-caudally oriented lamellae without secondary folding. In the goldenstriped soapfish, olfactory rosette is symmetrical, triangular, with the highest and longest lamellae in the center; new lamellae are formed at the dorsal and ventral margins of the rosette. In the fire-tail devil, olfactory rosette is wide at the top; it has the largest, trapezoidal lamellae. As the fish grows, the relative length of the lamellae in the middle part of the rosette becomes shorter than those located above and below, with new lamellae appearing only at the lowest part of the rosette. As the fish grows larger, the number of lamellae increases; there are 21 lamellae in the largest specimens of goldenstriped soapfish (absolute body length 12.5 cm), and 19 lamellae in fire-tail devil (17.5–18.5 cm). In both species, there is a platform located in front of the rosette, under the opening of the anterior nostril, which receives the incoming flow of water. They have lacrimal and ethmoid ventilation sacs, approximately equal in volume, but differing in shape and location. A scheme of ventilation of the olfactory cavity has been proposed.</p>