Dritte Sitzung. 



Donnerstag, den 18. August, Nachmittags 72 3 Uhr im allgemeinen 

 Hörsaale des Naturwissenschaftlichen Institutsgebäudes. 



Den Vorsitz führt: Herr Prof. Dr. E. Fr aas (Stuttgart). 



Herr Prof. Dr. R. S. Lull (New-Haven, Conn.) hält seinen 

 angezeigten Vortrag: 



The Armored Dinosaur stegosaurus unguiatus, recently 

 restored at Yale University. 



By Richard S. Lull (New-Haven, Conn.). 



With 4 Figures. 



I. Introductory. 



The recent mounting of the first articulated skeleton of 

 Stegosaurus, at Yale University, together with the remarkable 

 facts which it presents, has prompted the presentation of this 

 preliminary sketch of the most unique of reptiles. 



The American dinosaur Stegosaurus was first described by 

 Professor Othniel C. Marsh of Yale University in 1877, the de- 

 scription being based upon the skeleton which is now mounted 

 in the Peabody Museum at Yale and which forms the subject 

 of my discourse. Repeated articles by Marsh added materially 

 to our knowledge of the creature until in 1891 the first attempt 

 was made to restore the animal on paper with the wonderfully 

 accurate results attained by the great paleontologist in so many 

 similar attempts. Some errors naturally creep in wehn one is 

 working entirely in one plane of space. These the actual mounting 

 of the skeleton bone by bone alone can rectify. 



Other writers have discussed this most bizarre of reptiles 

 but the most notable contributions thus far have been made by 

 Professor Mars h. It is but fitting, therefore, that his Insti- 

 tution should be the first to restore the creature, using the type 

 skeletons of the best known species Stegosaurus unguiatus for 

 the work. 



