Mr. E. T. Dumble, State Geologist, Austin, Texas:

DEAR SIR—I herewith transmit the manuscript of a check list of the Invertebrate Fossils of the Cretaceous Series of Texas, which has been prepared by me without cost to the State. To ascertain and record the stratigraphic and faunal position of these fossils has long been an accompanying subject of the writer's investigations, but the fundamental questions of stratigraphy have precluded the publication of the paleontologic details, and the brief and still incomplete information contained in these pages would be even longer withheld were it not for the fact that the local studies of the formations can be advanced more rapidly with this information before the observer. The work is as condensed as is consistent with clearness. A brief statement is made of the present state of our knowledge of the Cretaceous formation of Texas. This is followed by a short description of the rocks of the standard section along the Colorado river, which transects these formations. The details of this section have been worked out with great care by Messrs. J. A. Taff and N. F. Drake under my direction, and will serve as a temporary standard by which to work out stratigraphic relations and prove invaluable in determining artesian well areas, in classifying the agricultural soils, building materials, and other economic features.

Following this is the Annotated Check List of known species and pseudo species, accompanied by catch references to name of author, place and year of publication, and stratigraphic occurrence of species, if known, together with notes. An attempt is made to show in tabulated form the range of these species, and to classify them into faunas. Finally the reference bibliography is added.

Nearly all the species herein mentioned were originally described without reference to their stratigraphic occurrences or faunal association, and this paper is an attempt to supply these omissions, as far as possible, and to make the paleontologic literature available to the student. The Check List, imperfect as it is, has been the result of many years observation and study. It was originally undertaken while the writer was a student in the laboratory of Cornell University in the year 1883, and has been amplified and remodeled from time to time as occasion afforded the opportunity. Although it contains, as far as it has been possible to ascertain, nearly all that is known at present upon the subjects treated, it is still incomplete in many details.

Acknowledgement should here be made to Mr. C. B. Boyle, of the Division