S. hyattii new. Recessional after S. cineria-varia of Hog Island, but differs from it in a heavier, un sharpened margin, less well defined callus, more open aperture, larger parietal tooth, and more yellowish color to the fleckings.
He was greatly impressed with the value of the series as illustrating the evolution of species and the ease with which species could be determined when com paired with others in mass. He also agreed with me in believing that a species may become established even though it is still bound to its parent species by living links, and counseled me never to abandon that idea.