The following abstract gives the latest results of the examination of collections of fossils, chiefly made by the United States Geological Survey, which have passed through my hands within the past few years.
The descriptions of the species mentioned and of others previously noted in my paper, “ Jura and Trias at Taylorville, California,”* will be published by the United States Geological Survey when the proper illustrations can be prepared.
Monotis Beds.—The presence of the Trias above the Carboniferous in American and Sailors canyon south of Cisco was at first considered certain from the presence of the Monotis beds containing two new species, M. semiplicata and symmetrica, but further information is essential before this can be admitted. According to the observations of Dr Curtice these beds lie between the Carboniferous and the Daonella beds.
Daonella Beds.—The Daonella beds contain several . . .