. The Echo. Mollusks. 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 distinc
. The Echo. Mollusks. 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?. 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 Western Society of Malacologists; Western Society of Malacologists. Abstracts and proceedings of the annual meeting. [San Diego, Calif. ] Western Society of Malacologists
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