iSpS.j Oslwrn, Additional Characters of Camarasaurus. 22 7 



3. Historical Notes. 



Large Cetiosauria have been named from these and similar 

 beds' in C'olorado, as follows : 



No. I. Titaiiosaiirus mo)itanus Marsh. — Am. Jour. Sc , July, 1877, p. 87. 

 — Golden, Colorado. 



No. 2. Camarasaurus suprc/niis Cope. — Pal. Bull. 25, Aug. 23, 1877, Proc. 

 Am. Phil. Soc. — Canon City, Col. 



No. 3. Catilodon divcrsidcns'^ Cope. — Pal. Bull. 26, p. 193.— Canon City, 

 Col. 



No. 4. Tichostetis iucasamis" Cope. — Pal. Bull. 23, p. 194, Nov. 21, 1877. 

 Proc. Am. Phil. Soc. — Canon City, Col. 



No. 5. Atlantosatirtts {Tifanosatiriis) inoiitaiiiis Marsh. — Am. Jour. Sc, 

 Dec, 1877, P- 514- — Colorado. 



No. 6. Apatosaiirns ajax Marsh.— Am. Jour. Sc, Dec, 1877. — Colorado. 



No. 7. Apatosaurits grandis Marsh. — Am. Jour. Sc, Dec, 1877, p. 515. — 

 Colorado. 



No. 8. AnipJiicalias alius Cope. — Pal. Bull. 26, Dec. 10. 1877. Proc Am. 

 Phil. Soc. — Caiion City, Col, 



No. 9. Amphica:lias latus Co'pe. — Pal. Bull. 26, Dec. 10, 1877. Proc. Am. 

 Phil. Soc. — Caiion City, Col. 



No. 10. Syinpliyrophus inusculosiis- Cope. — Pal. Bull. 26, p. 246, Jan. 12, 

 i8g8. — Cafion City, Col. 



No. II. Allanlosaurus iiniitanis Marsh.- — Am. Jour. Sc, March, 1878, p. 

 241. — Colorado. 



No. 12. Brontosaurus excclsus Marsh. — Am. Jour. Sc, Dec, 1879. — 

 Como, Wyoming. 



The rapid and profound transformations in the characters of 

 the vertebrtC in different parts of the back bone give these animals 

 an entirely unique position among reptiles, and largely explain the 

 diversities of view as well as the numerous generic references, held 

 by different authors, as indicated in the following brief resume : 



(i) The tirst notice of these animals in American literature was by Marsh, ^ 

 under the name of Tilauosaiirtis montanus. This generic name had been 

 shortly before employed by Lydekker.'* (2) The second notice was by Cope,^ 

 in which the name Camarasaurus was proposed. The species Camarasaurus 

 suprevius was based upon a number of dorsal vertebrae from the supposed 

 Dakota Beds of Colorado, near Canon City. In 187S'' these remains were 



' These beds are equivalent to the Wealden of England, from which many large Dino- 

 saurs have been described, of the same order (Cetiosauria) and possibly representing the 

 same genera. 



- Never fully characterized or figured. 



3 Notice of a new and Gigantic Dinosaur. Am. Journ. Sc. July, 1877, p. 88. 



1 Rec. Geol. Surv. Ind., Vol. IV. p. ^(8. 1877. 



•'"' On a Gigantic Saurian from the Dakota Epoch of Colorado. Pal. Bull., XXVI, Pub- 

 lished Aug. 2;^, 1877. 



" On the Saurians recently discovered in the Dakota Beds, etc. — Am. Nat., Feb., 1878, 

 p. 71. 



