. The Echo . Figure 12. Chicoreus florifer, shell. Figure 13. Murex cabriti, shell. The radula is distinctive in its relative simplicity. As in the groups mentioned above, the rachidian tooth is shallow (, has comparatively little depth) and is more or less gently arched. Generally, the central cusp is longest, followed in size by the two lateral cusps and finally by the two small intermediate cusps (Figures 14, 15). No denticles are found on the muricine rachidian tooth comparable to those on the teeth of thaidids and ocenebrine forms. The lower angles of the tooth may or may not be draw
. The Echo . Figure 12. Chicoreus florifer, shell. Figure 13. Murex cabriti, shell. The radula is distinctive in its relative simplicity. As in the groups mentioned above, the rachidian tooth is shallow (, has comparatively little depth) and is more or less gently arched. Generally, the central cusp is longest, followed in size by the two lateral cusps and finally by the two small intermediate cusps (Figures 14, 15). No denticles are found on the muricine rachidian tooth comparable to those on the teeth of thaidids and ocenebrine forms. The lower angles of the tooth may or may not be drawn into minor points, depending on the genus. In addition, the interior of the muricine operculum has a thickened, calloused margin and a depressed central region that is variously sculptured. 61
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