. Bulletin of the Natural History Museum Zoology. FOREGUT ANATOMY AND CLASSIFICATION OF CONOIDEA 141 be formed from two pieces as in Ptychobela suturalis (see above). Lack of material precluded further study of this and the type iii wishbone teeth. c) Hollow teeth There is a great diversity of detailed variation in the form of hollow marginal teeth even within a single genus (see for example, James (1980) and Nybakken (1990) for Conus and Bogdanov (1990) for Oenopota). However, for the purposes of this analysis we recognise only five main types of hollow teeth, (i) Teeth of this type are long,
. Bulletin of the Natural History Museum Zoology. FOREGUT ANATOMY AND CLASSIFICATION OF CONOIDEA 141 be formed from two pieces as in Ptychobela suturalis (see above). Lack of material precluded further study of this and the type iii wishbone teeth. c) Hollow teeth There is a great diversity of detailed variation in the form of hollow marginal teeth even within a single genus (see for example, James (1980) and Nybakken (1990) for Conus and Bogdanov (1990) for Oenopota). However, for the purposes of this analysis we recognise only five main types of hollow teeth, (i) Teeth of this type are long, slender, and enrolled, with a small base. The base is not differentiated morphologi- cally and is not solid. The distal end of the tooth may be simple, or more or less, elaborately barbed (Figs 22e,g). There is an opening near the distal tip and a second opening placed more or less terminally at the proximal end. The shaft oiHastula hectica is perforated by holes (Taylor, 1990, fig. 2). For some Conus species, Nybakken (1990) has shown that during ontogeny, the hollow, rolled teeth develop from open, guttered forms and become progressively more elaborately barbed. Hollow teeth of Type i are found in species of. Fig. 20. Radulae of Clavinae and Crassispirinae. a. marginal tooth of Drillia rosacea. Scale bar = 50 (xm. b. Funa latisinuata; blade-like marginal teeth with thin accessory limb. Scale bar = 50 \xm. c. Vexitomina garrardi; part of blade-like marginal tooth with accessory limb (arrowed). Scale bar = 10 ^m. d. enlargement of (d) showing accessory limb. Scale bar = 10 \ 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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