. Bulletin of the Natural History Museum Zoology. 66 KANTOR, A. MEDINSKAYA AND TAYLOR. Fig. 11 Radulae of Crassispirinae. a, Crassispira (Monilispira) pluto, scale bar = 20pm b, Crassispira (Striospira) kluthi scale bar * (Crassiclava) turricula scale bar = 30 pm d, C. (C.) turricula scale bar = 20 pm. 10pm c. Crassispira continuous with that of the proboscis wall. The wall of the rhynchodeum in its posterior part is muscular and free and much thicker than to the anterior. This posterior part of the rhynchodeum is able to evert. Powerful retractor muscles are attached at the point wh
. Bulletin of the Natural History Museum Zoology. 66 KANTOR, A. MEDINSKAYA AND TAYLOR. Fig. 11 Radulae of Crassispirinae. a, Crassispira (Monilispira) pluto, scale bar = 20pm b, Crassispira (Striospira) kluthi scale bar * (Crassiclava) turricula scale bar = 30 pm d, C. (C.) turricula scale bar = 20 pm. 10pm c. Crassispira continuous with that of the proboscis wall. The wall of the rhynchodeum in its posterior part is muscular and free and much thicker than to the anterior. This posterior part of the rhynchodeum is able to evert. Powerful retractor muscles are attached at the point where the rhynchodeal epithelium changes; these run along the rhynchodeum and are attached to the buccal mass. In the retracted position, the proboscis is rudimentary (Fig. 13), being only about twice as long as than the radular tooth length. The mouth opening is very narrow. There is no anterior buccal tube sphincter and the sac-like enlargement of the buccal tube is small. At the base of the enlargement there is an intermediate sphincter, which lies at a distance of about three radular tooth lengths from the mouth and posterior to the proboscis. The buccal tube forms a loop poste- rior to the proboscis and widens greatly before opening in the buccal mass. Buccal mass and oesophagus The buccal mass is medium-sized, and located to the posterior of the mebt. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Natural History Museum (London). Andover : Intercept
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