HOLLAND AND PETERSON: OSTEOLOGY OF THE CHALICOTHEROIDEA. 7a [3) 
GENERA AND SPECIES WHICH HAVE BEEN FORMERLY 
REFERRED TO THE CHALICOTHEROIDEA. 
Genus CoLopus Wagner. 
Wagener in the Abhandl. d. K. Bayer. Akademie d. Wissenschaften, Band V, 
Abtheil. II, described Rhinoceros pachygnathus, and figured on Plate X, figs. 3 
and 4, the fragmentary lower jaw of a specimen, which undoubtedly pertained to a 
rhinocerotid. In the same journal, Vol. VIII, Pl. VII, fig. 15, he figures a portion 
of the dentition of a Chalicothere which he ascribes to Rhinoceros pachygnathus, 
still preserved in the Museum at Munich, and represented by a cast in the Car- 
negie Museum. This specimen was the type of Nestoritheriwum Kaup. Subse- 
quently (Sitzungsberichte d. K. Bayer. Akad. d. Wiss., Vol. II, pp. 81-82 (1861)) 
Wagner erected the genus Colodus for the reception of Rhinoceros pachygnathus. 
As the type specimen upon which he originally founded the species Rhinoceros 
pachygnathus is a true rhinoceros, the genus Colodus has been very properly 
accepted by Zittel and others as belonging to the Rhinocerotide, and by Zittel is 
regarded as a synonym of Atelodus Pomel. The erroneous reference of the superior 
dentition of a Chalicotheroid to Rhinoceros pachygnathus does not constitute a 
valid ground for regarding the generic name Colodus, afterwards applied to the 
species, as applicable to the Chalicothere from Pikermi, to which Kaup gave the 
name Nestoritherium. Colodus must be restricted to the Rhinocerotide, as the 
original type belonged to this family. 
Genus Daopon Cope. 
Though originally referred by Cope to the Chalicotheriide, it is an Entelodont. 
Cf. Peterson, Memoirs Carnegie Museum, Vol. IV, p. 63 (1909). 
Genus HoMALADOTHERIUM Flower, Proceedings of the Royal Society of London, 
Vol. XXI, p. 383 (1873). 
This name suggested by Huxley in his Annual Address before the Geological 
Society of London, which was reported in the Quarterly Journal of that Society, 
Vol. X XVI, p. lvii (1870), but which is nomen nudum, was first given standing by 
Flower (I. c.). It since has undergone a number of mutations in spelling. Flower 
himself in 1874 gave it as Homalodontotherium, Burmeister in 1891 as Homalodon, 
and Florentino Ameghino in 1906 employs Homalotherium. 
The specimens described by Sir William Flower were the same to which 
Professor Huxley had referred in his address. Ameghino in the Anales del Museo 
