The Echo . echo16196873west Year: plate-like tooth. The other, for which I privately utilize the term '3-D' or 'three dimensional,' for lack of a better name, is shaped much like a triangular harrow. The median cusp is distinctly in front of the lateral cusps. (Figure 2.) Much more about these two radular types will be discussed by Messrs. Radwin and D'Attilio who are the leading workers in the field of radular study, but I must mention these radular types here for they are critical to my interpretation of the overall relation- ships among the various muricine genera. These two distinct radu
The Echo . echo16196873west Year: plate-like tooth. The other, for which I privately utilize the term '3-D' or 'three dimensional,' for lack of a better name, is shaped much like a triangular harrow. The median cusp is distinctly in front of the lateral cusps. (Figure 2.) Much more about these two radular types will be discussed by Messrs. Radwin and D'Attilio who are the leading workers in the field of radular study, but I must mention these radular types here for they are critical to my interpretation of the overall relation- ships among the various muricine genera. These two distinct radular types divide the subfamily into two major groupings, both of which go back to the earliest history of the line and suggest that the entire subfamily may have been polyphyletic. (a) <^' c?
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