342 University of California Publications in Geology [Vol. 7 



present paper Nothrotherium is doubtfully recorded as occurring 

 also in the type section of the San Pedro beds at San Pedro, 

 California. 



The material of Nothrotherium, available for study consists 

 of a skull and a tooth from the Rancho La Brea deposits ; and 

 a second phalanx, tentatively assigned to the same genus, from 

 the San Pedro beds. Megalonyx is thus far represented by a 

 left humerus, a left calcaneum, a single metapodial of the 

 posterior foot, and various digital elements of both anterior and 

 posterior feet, all from Rancho La Brea. 



The tooth of Nothrotherium was secured by the University 

 of California in 1906, while the skull of Nothrotherium was 

 excavated by the Southern California Academy of Sciences in 

 1909. The metapodial and digital elements of Megalonyx were 

 found closely associated and presumably belong to the same 

 individual. They were discovered by the University party at 

 Rancho La Brea in 1907 ; the humerus and calcaneum were 

 found in 1912. 



The writer's sincere thanks are due to Professor John C. 

 Merriam, under whose guidance this study was conducted. The 

 obligation of the writer is also expressed to Director P. H. 

 Daggett of the Museum of History, Science and Art of Los 

 Angeles, who kindly loaned the skull of Nothrotherium for study 

 and description. 



NOTHROTHERIUM GRACILICEPS, n. sp. 



Type specimen, a skull in the Museum of History, Science and Art, 

 Los Angeles, California, from the asphalt deposits of Rancho La Brea. 



Paratype: A second superior tooth, no. 10485, Univ. Calif. Col. Vert. 

 Palae., from the asphalt deposits of Rancho La Brea. 



Nothrotherium, was first described by Lund, 1 in 1839, under 

 the name of Coelodon maquinense from remains found in the 

 Cavern of Maquine in Brazil. In 1878, Reinhardt 2 distinguished 

 another species, Coelodon. escrivanense, also from a Brazilian 



i Lund, P. W., Recherches sur les mammiferes fossiles du Bresil, Ann. 

 Sei. Nat., 2. ser. (Zool.), vol. 11, p. 220, 1839. 



? Reinhardt, J., Kaempedovendyr-Slaegten Coelodon, Vidensk. Selsk. 

 Skr., 5 Raekke, naturvidenskabelig og mathematisk Afd., vol. 12, 3, pp. 

 253-349, V Tav. Kjobenhavn, 1878. 



