72 Kansas Academy of Science. 



day, Doctor Dean has restored a set of jaws measuring nine feet 

 across and having a gape of six feet. 



In my specimen the largest tooth is an inch and a half long^ 

 while the smallest is but three-eighths of an inch. According to 

 these measurements, the ancient shark with teeth six inches long 

 must have been 100 feet in length. That such measurements can- 

 not be relied on is proved by my discovery of a large part of the 

 shark Corax, from the Kansas chalk. The vertebrse proved to be 

 as large as in Lamna, and yet none of the teeth were over half an 

 inch in length. Further, I have in ray laboratory to-day a new 

 species of shark, found this season on Hackberry creek, whose 

 vertebrse are half as large as the Lamna we secured. The teeth 

 are so small that some of them can only be seen with a magnifying 

 glass. It is pretty safe to restore one of these extinct sharks, be- 

 cause their skeletons are so rare that they will in all likelihood 

 never be discovered. But I believe if these great teeth of the 

 Carolinas are ever, as in my specimen, found in place, the beautiful 

 restoration in the American Museum will go to the junk pile. 



On the 23d of June my sons Charlie and Levi started with their 

 team, wagon and outfit to drive across northern Kansas and Ne- 

 braska to Cheyenne river, in Converse county, Wyoming, to take 

 up the work we left off last year. I sent George in the meantime 

 to the rich fossil field at Florissant, Colo. Here he made a fine 

 collection of leaves, fruit, flowers and insects from the rich Tertiary 

 shales. Then Charlie proceeded to Wyoming, joining George 

 there, and I soon followed. What was my delight, on my arrival 

 at Newcastle, Wyo., to learn that Charlie had been so fortunate as 

 to discover a magnificent skull of the great Triceratops, with horn- 

 cores thirty-three inches long. This was sent to the American 

 Museum directly from the field. Professor Osborn writes, under 

 date of December 19, 1907 : "We have at last opened and examined 

 the Iriceratops skull, and I am happy to write you that we are all 

 delighted with it. It promises to be a very splendid specimen, 

 worthy of the other great things which you have found. The men 

 are hopeful of restoring the frill." You will not wonder that my 

 delight knew no bounds when we made this discovery in a so-called 

 barren country. This country has been deserted for years because 

 the collectors who have spent many years there for Yale and Car- 

 negie and the American Museum had declared it exhausted ; and 

 my party of three sons have found, since we entered it last year, 

 the best specimen of the great duck-billed Trachodon ever known. 

 This discovery proves that all the existing mounts made up from 



