. Bulletin of the Natural History Museum Zoology. FOREGUT ANATOMY OF CRASSISPIRINE GASTROPODS 71. Fig. 17 Radulae of Crassispirinae. a, Nqunw scalpta scale bar : d. Inquisitor aff. adenicus scale bar = 20 pm. 20pm b. Inquisitor lalifasciata scale bar = 25 pm c. Inquisitor aemula scale bar = 20 pm large cells. In approximately the posterior one tenth of the rhynchodeum the epithelium is non-glandular and continuous with that of the proboscis wall. The proboscis is short in comparison with the rhynchocoel (about 1/5 of its length), rather thick and not coiled. The proboscis walls are thick, form
. Bulletin of the Natural History Museum Zoology. FOREGUT ANATOMY OF CRASSISPIRINE GASTROPODS 71. Fig. 17 Radulae of Crassispirinae. a, Nqunw scalpta scale bar : d. Inquisitor aff. adenicus scale bar = 20 pm. 20pm b. Inquisitor lalifasciata scale bar = 25 pm c. Inquisitor aemula scale bar = 20 pm large cells. In approximately the posterior one tenth of the rhynchodeum the epithelium is non-glandular and continuous with that of the proboscis wall. The proboscis is short in comparison with the rhynchocoel (about 1/5 of its length), rather thick and not coiled. The proboscis walls are thick, forming about 25% of the proboscis diameter. The mouth is very narrow. The muscle of the proboscis walls are equally devel- oped along its length. The anterior buccal tube sphincter is very small and lies posterior to the mouth in front of medium-sized sac- like enlargement of the buccal tube. The epithelium, lining the enlargement forms a large pad, to which the base of a marginal tooth was attached. There is a large intermediate sphincter, situated at about three marginal tooth lengths distant from the mouth opening. The buccal tube has rather thin walls, forming about 10% of the proboscis diameter. It is lined with a tall folded epithelium. Buccal mass and oesophagus The buccal mass is large in comparison with the proboscis, equiva- lent to about two thirds of its length. It lies posterior to the proboscis, with a wide lumen and relatively thin walls. Buccal lips are absent. The oesophagus is greatly elongated between the buccal mass and nerve ring, forming a long loop. Anteriorly, it is wide and flattened, but soon becomes very narrow. There is no buccal sac. Glands The salivary glands are large, acinous and fused. The venom gland changes in histology abruptly after passing anteriorly through the nerve ring. The duct is very narrow, unciliated, and opens into the buccal cavity at the posterior border with the oesophagus. The muscular bulb is medium sized, of an irregular oval s
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