Begun in 1864 and wound up in 1883, this unfinished monograph includes Salter's important 'preliminary classification of trilobites'.

A photographic guide to Oklahomas Devonian trilobites. The geological history of Coal County, Oklahoma. Descriptions of rock formations where trilobites are fou

Forty-five species of lower Middle Ordovician trilobites, including six new genera and thirty new species, are described and illustrated from the extensive coll