FOSSIL FOOTPl.'INTS OF TIIF JURA-TRIAS. 463 



did not appreciate the full significance of the remains until Hitchcock had published his 

 views. 



Collections. — Extensive collections were made, most of the specimens finding a rest- 

 ing place in the Hitchcock ichnological cabinet which contains most of the type specimens 

 and representatives of almost every known species. 



Later collections were formed at Mount Holyoke college and at Yale luiiversity. 

 The latter collection, made under the direction of the late Professor Marsh, is said to rival 

 that of Amherst college itself, though the specimens are as yet unavailable for study 

 owing to lack of exhibition space. It is earnestly hoped that provisicn: for the study and 

 display of this collection will soon be made and the results given to science. 



Literature. — Three monumental works on the subject of ichnology were published 

 by President Hitchcock during his life and they form the classics of the literature of the 

 science. The first bore the title, " An attem23t to discriminate and describe the animals 

 that made the fossil footmarks of the United States, and especially of New England," and 

 was published in the Memoirs of the American academy of arts and sciences, 1 848. The 

 second work was the "Ichnology of New England,*" a large quarto, published in 1858, 

 by the Commonwealth of Massachusetts. This was followed in 1 Sbo by the " Supple- 

 ment to the Ichnology of New England," also published by the Commonwealth. These 

 are in addition to numerous papers published by Hitchcock in the American journal of 

 science and arts, and elsewhere, in all some eighteen titles. 



A posthumous work by Dr. James Deane entitled, " Ichnographs from the sandstone 



f 



of Connecticut river," published in Boston, in 1861, is a very interesting volume consist- 

 ing in the main of admirably executed drawings and photographs of the tracks. The 

 memoir itself is incomplete and adds but little to our knowledge of the subject. 



Classifications. — An historical review of the various classifications that have been 

 proposed will be of interest in that they show the evolution of the subject from its incep- 

 tion down to the year 1889, when the last impoi-tant paper was published. The first 

 classification was proposed by E. Hitchcock ('37b) and it will be observed that the names 

 were given to the tracks and not to the animals which made them. This classification 

 was as follows ; — 



