MEMOIR OF O. C. MARSH 529 



mals is scattered through a large number of separate papers, and con- 

 tributions were made to every known order. The Tillodontia comprise 

 one of the most remarkable of the types. Among others are the first 

 remains of fossil Primates, Cheiroptera, and Marsupialia, known from 

 North America. The Brontotheridse and Cory phodon tin received con- 

 siderable attention. A monograph had been begun on the former, and 

 restorations of a typical genus of each were published. 



One general conclusion of much significance was the outcome of his 

 researches on the mammals. It was that the Tertiary genera possessed 

 very small brains. As a single example, Dinoceras may be taken. This 

 animal was but little inferior to the elephant in bulk, but its brain 

 capacity was not more than one-eighth that of existing rhinoceroses. 



The first Mesozoic mammal in America was described by Emmons, in 

 1857, from the Triassic of North Carolina. Marsh, by his extensive dis- 

 coveries, was enabled to fill up the gaps to the Tertiary with many genera 

 and species from the western Jurassic and Cretaceous. Probably nine- 

 tenths of all the Mesozoic mammals known in the world were described 

 by him, and while these remains are of great interest, yet from their 

 fragmentary condition they are not of the highest scientific value, be- 

 cause little is known beyond the jaws and a few limb bones. 



In closing the outline of the discoveries made by this investigator, 

 one cannot help being impressed with their signal brilliancy, their great 

 number, and especially by their unique importance in the field of 

 organic evolution. Were all other evidence lost or wanting, the law of 

 evolution would still have a firm foundation in incontrovertible fact. 

 The study of variation and embryology in recent animals gives hints as 

 to the truth, but Paleontology alone can give the facts of descent. 



BIBLIOGRAPHY OF O. C. MARSH 



{Relating to geology and paleontology) 

 1862. 



On the Saurian vertebrae from Nova Scotia : Amer. Jour. Set., second series, vol. 33, 



p. 278. 

 Description of the remains of a new Enaliosaurian (Eosaurus acadianus) from the 



Coal Formation of Nova Scotia: Ibid., vol 34, pp. 1-16, pis. i, ii. 



1864. 



Notice of a new fossil annelid (Helminthodes antiquus) from the lithographic slates 

 of Solenhofen: Ibid., vol. 38, p. 415. 



1865. 



New genus of Jurassic annelides (Ischyracanthns) : Zeilchr. deutsch. geol. Gesell., 



vol. 17, p. 13; Berlin. 

 Double lobe lines of Ceratites nodosus : Ibid., pp. 267-269. 



