. The Echo . Figure 15. Murex cabriti, 2/3 of a transverse radular tooth-row. Subfamily Ocenebrinae. This is one of the most misinterpreted groups in the super- family. At various times its members have been assigned to the Muricinae and at others to the Thaididae. Certain of its mem- bers have also been placed in the Coralliophilidae (£-^«t "Coralliophila" kincaidi Dall [=fraseri]), and that family has reciprocated, some of its members having been assigned to the Ocenebrinae (e_.£., "Ocenebra" parva Smith). ^Vhat apparently is needed is a clear, unambiguous characterizatio
. The Echo . Figure 15. Murex cabriti, 2/3 of a transverse radular tooth-row. Subfamily Ocenebrinae. This is one of the most misinterpreted groups in the super- family. At various times its members have been assigned to the Muricinae and at others to the Thaididae. Certain of its mem- bers have also been placed in the Coralliophilidae (£-^«t "Coralliophila" kincaidi Dall [=fraseri]), and that family has reciprocated, some of its members having been assigned to the Ocenebrinae (e_.£., "Ocenebra" parva Smith). ^Vhat apparently is needed is a clear, unambiguous characterization of the subfamily on several bases. The ocenebrine shell may be large but most forms are moder- ately to very small (Figure l6). The shell surface is generally quite scabrous but smooth forms of some otherwise scabrous spe- cies are known. In many genera a closed (, fused) canal is the rule, but this is not a uniform character throughout the subfaimily. The operculum is similar to that of the Thaididae in being roughly trapezoidal and unthickened. The nucleus of the operculum is lateral. The thinness of the ocenebrine operculum, especially medially, causes it to bend sharply at that point when allowed to dry in situ. The radula is muricoid, with typical muricid lateral teeth. The rachidian is, however, distinctive. Instead of a shallow, tiara-like tooth, as in the Muricinae, it is much deeper. As in the Muricinae, there are five cusps. In the Ocenebrinae, however, 62
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