ORIGINAL DESCRIPTIONS OF OPISTHOCCELIA 383 



Genus Species Original date Present determination 



I. Camarasaurus August 23, 1877 Camarasaurus 



1. G. supremus ' August 23, 1877 G. supremus 



2. G. leptodirus June, 1879 G. supremus 



II. Gaulodon November 21, 1877 Provisionally, 



Gamarasaurus 



3. G. diversidens ' November 21, 1877 Provisionally, 



G. supremus 



4. G. leptoganus January 10, 1878 Provisionally, 



G. supremus 

 III. Tichosteus November 21, 1877 Indeterminate 



5. T. lucasanus ' November 21, 1877 Indeterminate 



6. T. cequifacies May 3, 1878 Indeterminate 



IV. AmpMcoelias December 10, 1877 Amphicoelias 



1. A. alius ^ December 10, 1877 A. alius 



8. A. laius December 10, 1877 Provisionally, 



G. supremus 



9. A. fragillimus August, 1878 Indeterminate 



V. Si/mphyrophus Januarj^ 1878 Indeterminate 



10. S. musculosus ' January, 1878 Indeterminate 



YI. Epanierias June, 1878 Provisionally, 



carnivore 



11. E. amplexus ^ June, 1878 Provisionally, 



carnivore 



Preparation and Eesearch in the American Museum 



acquisition 



The Cope Collection of Fossil Keptiles had been examined in Phila- 

 delphia by Dr. W. D. Matthew and was transferred to the American 

 Museum under his direction. The preparation of the material was made 

 by Messrs. Kaison^ Charles and Otto Falkenbach, Lang, Christman, 

 Hoover, Brickner, Carr, and Home. 



RESEARCH IN ISOJ, 



Doctor Matthew went over the material, under the direction of Pro- 

 fessor Osborn, and catalogued and identified it so far as was possible with 

 the aid of the records available, distinguishing the material obtained in 

 the earlier collecting, in 1877, by Superintendent Lucas, from that ob- 

 tained in the later collecting, in 1880, under Mr. Ira H. Lucas. Subse- 

 quently Professor Osborn and Dr. W. K. Gregory made a further study 

 of the vertebrae and arranged them provisionally into series, using, in 

 addition to the previous records, the color of the bones, the bones of the 



' Genotype. 



