. 
Cope. ] 1 76 (Oct. 20, 1871. 
our explorations were attended with success. When we shifted camp, it 
was to go to Hagle Tail in Colorado, whence we returned again to Fossil 
Spring. The richness of this locality was again apparent, and we added. 
to our collection a number of species. Among these may be mentioned 
Liodon ictericus Cope and two new Clidastes. The writer originally pointed 
out the existence of representatives of the orders Pythonomorpha and 
Sauropterygra, in this cretaceous basin. Prof. Marsh’s explorations 
determined the existence of Ornithosauria and Orocodilia. The present 
investigation adds Dinosawria and perhaps Zestudinata, or the group that 
the new form Protostega Cope represents. 
The preceding account expresses some of the points of interest observed. 
These, with others, now unnoticed, will be included in a final report. 
The giants of this sea were the Liodon proriger, Cope, L. dyspelor, Cope, 
Polycotylus latipinnis, Cope, and Hlasmosaurus platyurus, Cope. Of 
these the first was apparently the most abundant. The second was the 
most elongate, exceeding iu length perhaps any other known reptile. 
The last named had the most massive body, and exhibited an extraordi- 
nary appearance in consequence of the great length of its neck. 
For kind assistance, I am much indebted to Capt. Edwin Butler, post 
commandant at Fort Wallace, to Dr. W. H. King, post surgeon, and to 
Capt. Wyllys Lyman. To Lieut. Jas. H. Whitten and Sergeant W. 
Gardner, who accompanied the expedition, much of its success is also due. 
Iam, etc., EDW. D. COPE. 
Stated Meeting, Nov. 3d, 1871. 
Present, eleven members. 
Vice President, CRESSON, in the chair. 
Letters of envoi were received from the societies at Riga 
Chemnitz, Wiesbaden, Lyons and Copenhagen, the University 
of Norway, and the Royal Geographical Society at London. 
Letters of acknowledgment were received from the Nassau 
N. History Union at Wiesbaden, (Proceedings 78-83,) and 
the Imperial Society of Agriculture and Natural History at 
Lyons, July 20, (73-81,) requesting the completion of their 
series, which, on motion, was so ordered. 
Donations for the Library were received from the Societies 
at Riga, Chemnitz, Gorlitz, Wiesbaden, Lausanne, Lyons, 
Liverpool, Glasgow and Salem, Mass., the Berlin Academy, 
Geological Seciety, and Archeological Institute, the Austrian 
Geological Institute, Anthropological Society, Herr von Hauer, 
