In addition he argued that "Odontogriphus"’ shedding and replacement of tooth-rows, the rows' staying in the same relative positions when isolated and the evidence that "Odontogriphus" sometimes swallowed discarded tooth-rows did not prove that "Odontogriphus" was an evolutionary "aunt" of molluscs, since eunicid polychaetes also molt and replace their feeding apparatus (which sometimes resembles a radula), and sometimes eat the discarded material. He also doubted whether the two tooth-rows of "Odontogriphus" and "Wiwaxia" could perform all the functions of the multi-row radula – rasping, capturing scraped food, sorting it and transporting it to the gullet. In his opinion the differences between the narrower first tooth-row and slightly wider second one in both "Odontogriphus" and "Wiwaxia" were unlike those of a molluscan radula, in which the much more numerous tooth-rows are identical; instead he argued that these two rows resembled the permanent lower jaw and moltable upper jaw of modern dorvilleid polychaetes.