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Reflect the mantle cavity wall to the left-hand side, exposing the gill, osphradium, hypobranchial gland, rectum, and anus within the inner surface of the mantle cavity wall, each coursing parallel to the style sac.
Low, broad fold of siphon's right base separates anterior end of osphradium and gill.
Wedemeyer and Schild  and Kamardin et al.,  suggested that the osphradium plays a key role in the chemosensitivity of the pond snail Lymnaea stagnalis and diffusion of larger molecule will be slower and they are highly improbable that they penetrate the connective tissue covering of osphradium.
To identify other baits, the activity in the pallial nerve of whelks was determined during exposure of the osphradium to odorant solutions prepared from horseshoe crab eggs, horseshoe crab hemolymph, and hard clam (Mercenaria mercenaria) tissue.
Perhaps it is the plasticity behind this ability to adapt, which must involve the central nervous system and probably the osphradium (Spengler and Kohn, 1995), that is unusually robust in C.
Mud snails use their siphons to pump water over the osphradium, which is an olfactory organ that detects chemical food stimuli (Bailey and Benjamin 1968, Garton et al.
Water is drawn through the siphon into the mantle cavity and over the osphradium, a highly developed chemosensory organ (Hughes 1986).
The diversity of chemosensory organs among marine organisms is great, from crustacean aesthetasc sensilla to molluscan osphradium, rhinophores, and oral tentacles, to polychaete nuchal organs (Laverack, 1968; Emery, 1992).
The siphon supplies water and its chemical contents to gills and the osphradium, the major chemoreceptor organ.
Comparative external morphology of the Conus osphradium. J.
F-r2 appears in the region where the osphradium will develop, whereas FC-2 seems to lie in a position that corresponds to the location of the right abdominal ganglia.
The osphradium is a molluscan sensory organ characteristic mainly of aquatic forms.
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