World Polychaeta Database (WPolyDb). Publication date: "Issued December 3, 1934."
[From introduction:]
In 1886, Dr. J. M. Clarke published, in the Sixth Annual Report of the State Geologist of New York, a short note on the annelid jaws which are to be described in the present paper. He did not attempt specific identification but assigned them to several genera. The writer is indebted to Dr. Rudolf Ruedemann, of the New York State Museum, for the opportunity of more fully describing these Polychaeta annelid jaws, distinguished among other characters by their large size. These jaws came from near Canandaigua, New York.