1. Behind them are the rhinophores, olfactory organs which often have complex forms. 2. The olfactory organ , that is more developed than the one in the Mesogastropoda. 3. There is nothing quite like a political campaign to exercise the olfactory organ . 4. The head also thickens, the olfactory organ enlarges, and their teeth are lost. 5. The osphradium, the olfactory organ linked with the respiration organ, is usually relatively small. 6. The larvae are 4-10 mm long, with well-developed olfactory organs and no sexual dimorphism. 7. Other ostracoderms, such as the Galeaspida are now known to have a paired olfactory organ . 8. The vast diversity of olfactory organs is largely attributed to the long evolutionary lifespan of fish. 9. The sensitive olfactory organs help the male to detect the pheromones that signal the proximity of a female anglerfish. 10. "Babies, " she writes, catching my eye, " rely heavily on the olfactory organs to help them seek nourishment ."