234 
PATAGONIAN EXPEDITIONS I PALAEONTOLOGY. 
Adinotherium splendidum (Ameghino). 
Adinotherium splendidum Amegh.; Enum. sistem., etc., 1887, p. 17. 
Adinotherium pule hrumMtrctYdii ; Rev. del Mus. de La Plata, T. I, 1891, 
p. 407 (. fide Ameghino). 
Adinotherium silvaticum Merc., in part; Ibid., p. 408 [fide Ameghino). 
Adinotherium antiquum Merc.; Ibid., p. 410 [fide Ameghino). 
Nesodon ovinus Lydekker, in part ; An. del Mus. de La Plata, T. Ill, 
1893. p- 25. 
Noaditherium splendidum Amegh.; An. del Mus. Nat. de Buenos Aires, 
T. XVI, 1907, p. 84. 
No example of this well-defined species is contained in either the Prince- 
ton or the New York collection. Ameghino’s account of it is, briefly, as 
follows : The cranium is notably higher dorso-ventrally than in the pre- 
ceding species. The forehead is short and triangular and the temporal 
ridges are very thick and prominent and describe a sigmoid course in con- 
verging into the sagittal crest ; the postorbital processes have an unusually 
anterior position and are long and extremely broad and massive, projecting 
almost directly outward, they conceal the orbits when the skull is viewed 
from above. These processes are very rugose and Ameghino believes that 
they supported small horns. “Tout parait indiquer que ces apophyses 
portaient une paire de petites cornes super-orbitaires ” (’07, 88-9). This 
is a most improbable suggestion, and such rugose postorbital processes 
occur in old males of the other species, not to mention the various rugosi- 
ties of the rhinoceros skull which have no relation to horns. The frontal 
horn-bosses of A. splendidum are better defined and form a more distinct 
pair than in any of the preceding species. 
Though specifically well distinguished, there is nothing in the known 
structure of A. splendidum which would justify its generic separation from 
Adinotherium. 
Localities. — The type-specimen was obtained from the cliffs of the Rio 
Santa Cruz (Amegh., ’89^, 453) and, in general, it is stated that the spe- 
cies occurs in the Notohippus Beds and the base of the Santa Cruz. 
PHOBEREOTHERIUM Ameghino. 
Phobereotherium Amegh.; Enum. sistem., etc., 1887, p. 18. 
Adinotherium Mercerat, in part; Rev. del Mus. de La Plata, T. I, 1891, 
p. 408. 
