On New Species of Fossil Sponges from the Siluro-Cambrian at Little Metis on the Lower St. Lawrence is a scientific book written by John William Dawson in 1889. The book describes new species of fossil sponges that were discovered in the Siluro-Cambrian rocks at Little Metis on the Lower St. Lawrence River in Canada. The author provides detailed descriptions of the physical characteristics of each species and includes illustrations to aid in identification...