W. Cross — Post- Laramie Deposits of Colorado. 27 



Hadrosauridte and Agathaumidee " (= Ceratopsidse, Marsh). 

 He then remarks that it is to be compared with Dysganus. 

 !Now the original descriptions of the genera Dysganus and 

 Diclonius and of the species Lcelaps incrassatus are in an 

 article entitled : " Descriptions of some vertebrate remains 

 from the Fort Union beds of Montana,"* without any further 

 statement in the text as to the geographical or geological posi- 

 tion of the occurrence. The new dinosaurian genus Monoclo- 

 nius was also described in this article. Monoclonius is now 

 regarded as belonging to the horned Dinosaurs, and four species 

 have been named by Professor Cope,f from Montana. One of 

 these, M. sjohenocerus, came from near Cow Island, on the 

 Missouri, while another, M. recurvicornis, came from the 

 "Judith River beds" on the north side of the Missouri River 

 nearly opposite the mouth of Dog Creek. This last informa- 

 tion is found in Professor Cope's report of the expedition 

 during which all of these Dinosaurs appear to have been col- 

 lected.^: 



From the casual statements of localities and horizons above 

 recapitulated it appears that somewhere in the 2000 feet of 

 strata assigned by Professor Cope to the Laramie on the 

 Animas River several species of Dinosaurs have been found, 

 and that they most resemble a fauna collected in " Fort Union " 

 beds near Cow Island, on the Upper Missouri River, in Mon- 

 tana, a locality which has. furnished at least one species of the 

 Ceratopsidse. It is worthy of note that the so-called ik Lara- 

 mie " section below the Puerco on the Animas River contains 

 strata resembling the Denver beds, and also Dinosaurian re- 

 mains of types resembling, or associated in Montana with, the 

 Ceratopsidse. "Whether the Dinosaurs occur in the Denver- 

 like beds remains to be proven. It is certainly of importance 

 to discover the character of the vertebrate fauna in beds 

 thought to occur conformably below the Puerco. 



Middle Park. — The Hayden atlas of Colorado represents a 

 large continuous area of Laramie beds in Middle and North 

 Parks, a representation based very largely upon the work of 

 the late A. R. Marvine, during the seasons of 1873 and 1874. 

 In the annual report for the former year Marvine describes in 

 considerable detail the region of Middle Park, but this able 

 and lamented geologist died before the notes of the next sea- 

 son's work could be put in shape for publication, and the data 

 he then collected are practically lost to science. JSTo publica- 

 tion of importance concerning the supposed Laramie beds of 

 Middle Park has appeared since Marvine's report. 



* Proc. Acad. Nat. Sci. Phil., vol. xxviii, p. 248, 1876. 



f " The Horned Dinosauria of the Laramie," Am. Naturalist, vol. xxiii, p. "715. 



\ Bulletin, U. S. G. & G. 3., vol. iii, p. 565, 1871. 



