The splendid skeleton of Dimetrodon gigas I collected in 1917 and sold to the United States National Museum has been mounted at last, and is one of the world's famous specimens. I do not know of a more perfect single individual. It came from the famous Craddock quarry discovered by the late Doctor Williston's assistant, Mr. Miller. Through the kindness of Mr. Craddock, the owner of the quarry, I not only collected there in 1917, but last year. Owing to the fact that the quarry is now covered with about twenty feet of earth and clay of the toughest character the work was very difficult and I was obliged to employ a man with a heavy team of horses, with plow and scraper. I succeeded in securing many more or less perfect skeletons of several species. Unfortunately, none were as perfect and capable of making into a fine open mount as the National Museum specimen. This quarry is An the face of a hill. As I have gone deeper and deeper into the hill the manner in which the animals were stranded here becomes more and more apparent. On the very bottom of the quarry are innumerable bones of very small animals, Seymoriana and other batracians, etc. They are usually scattered and are free from matrix, consequently they are among the rarest of Permian vertebrates that have not been injured by the encrusting silica that covers all the other bones at higher levels, and which is so difficult to remove. The National Museum specimen came from near this level. Above are about four or five feet in the heavy, fine-jointed red clay. Though water has filtered and coated all the bones with silica, I found several more or less perfect skeletons. Often the entire column, except the tail, with enormous spines were present; sometimes the arches and limbs, as in the best specimen we found, discovered by my son, George F. The longest spine of this individual was four feet. Most of the column and tail were present. The skull was disarticulated. The arches seemed present. Many of the spines, however, were twisted and interwoven, all the bones covered with a thin coating of silica. As I understood Doctor Gilmour, it took two preparators a year to prepare and mount the National Museum specimen. You will realize something of the labor it will take to prepare this one. This, with my whole collection from the Craddock quarry, I sold to the American Museum. From Seymour, Tex., my boys, George and Levi, drove my car to the Rock creek Horse quarry, near Tulia, Tex., but the formidable mass of sand that lay above it induced them to turn their Ford truck northward, and I joined them in the Kansas chalk in Logan county, on Butte creek. I was so fortunate as to find a fine tylosaur skeleton the second day in the field. There were twenty-one feet of the skeleton present in fine chalk. The complete skull was crushed laterally. Nearly the complete front arches and limbs were present, as was also the pelvic bones and both femora. All the vertebrae to well into the caudal region beyond the lateral spines were continuous, with the ribs in the dorsal region. Between the ribs was a large part of a huge plesiosaur with many half-digested bones, including the large humeri part