Page:Walcott Cambrian Geology and Paleontology I.djvu/31



The monograph on the Cambrian Brachiopoda, upon which I have been working for so long, is about ready for the press, and attention is now being given to the preliminary study of some of the American Cambrian trilobites. If students and collectors in any country know of interesting or new forms of Cambrian or Lower Ordovician trilobites, or of more perfect specimens representing previously described forms, I should very much like to have their cooperation in making this investigation as thorough and complete as possible.

This is the first of a series of brief papers that will be published as new material of interest is worked up. The classification of Dr. Charles E. Beecher will be followed, in the preliminary studies at least, with such modifications as may appear necessary during the course of the investigations.