120 INDEX GENERUM MAMMALIUM. 
LE 
Arctotherium LypEKKER (see Arretotherium ). Ungulata, Agriochceride. 
Argali (subgenus of Ovis) Gray, 1850. Ungulata, Artiodactyla, Bovidee. 
Knowsley Menagerie, 37, 1850; Cat. Ruminant Mamm. Brit. Mus., 57, 1872. 
Type: Agoceros argali Pallas, from Siberia. 
Argali: Mongolian and Tungusian name of a wild sheep. 
Argillotherium Davies, 1884. Creodonta, ? 
Geol. Mag., London, new ser., Decade III, 1, No. x, 438, Oct., 1884. 
Type: Argillotherium toliapicum | Davi les, from ihe DO Clay iecons) of Shep- 
pey, Kent, England. 
Extinct. Based on a mutilated skull without iocum 
Argillotherium: &pytAXos, white clay; 677pzov, wild beast—from the deposit in 
which the remains were found. 
Argocetus Grocrn, 1841. Cete, Delphinidee. 
Hand- u. Hilfsbuch Naturgesch., I, pp. xxxiv, 169, 1841; Tuomas, Ann. &' 
Mag. Nat. Hist., 6th ser., XV, 191, Feb. 1, 1895. 
Type: Delphinapterus leucas (= Delphinus leucas Pallas) of the Arctic seas. Prac- 
tically a new name for Delphinapterus Lacépéde, 1804. 
Argocetus: Gpy os, shining, glistening; «tos, whale—from its pure white color. 
Argyrocetus LyYDEKKER, 1894. Cete, Platanistidee. 
Nat. Science, IV, No. 24, p. 125, Feb., 1894; Anal. Mus. La Plata, Paleeont. Argen- 
tina, IT, for 1893; Art. No. u, 10-12, pl. v, Apr., 1894; AwEanrwo, Revista 
see Zool., Buenos Ayres, II, entr. 7, p. 193 footnote, July 15, 1894 (date of 
publication). 
Type: Argyrocetus patagonicus Lydekker, from the Territory of Chubut, Patagonia. 
Extinct. Based on an imperfect skull and some vertebre. 
Argyrocetus: &pyvpos, silver, i. e., La Plata; «ros, whale. 
Argyrodelphis LypEkKER, 1894. Cete, Platanistidee. 
Anal. Mus. La Plata, Pal. Argentina, II, for 1898, Art. No. 1, 12-13, pl. v1, 
Apr., 1894. 
New name for Notocetus Moreno, 1892, which is preoccupied by Notiocetus 
Ameghino, 1891, a genus of extinct Balenid:.. Antedated by Diochotichus 
Ameghino, Feb., 1834 (see Amecurno, Revista Jardín Zool., Buenos Ayres, 
II, entr. 7, p. 193%ootnote, July 15, 1894). E 
Extinet. 
Argyrodelphis: &pyvpos, silver, i. e., La Plata; deA@is, dolphin. 
Argyrohippus AmeEGHrINo, 1901. Ungulata, Litopterna, Notohippide. 
[ Anal. Soe. Cien. Argentina, LI, 77, Mar.-Apr., 1901—nomen nudum. ] 
Bol. Acad. Nac. Cien. Córdoba, X VII, 81-85, May, 1902 (sep. pp. 13-17). 
Species: Argyrohippus boulei Ameghino and A. fraterculus Ameghino, from the 
Patagonian formation (Eocene) of Patagonia. 
Extinct. . 
Argyrohippus: &py'vpos, silver, i. e., La Plata; Zzzros, horse. 
Argyrohyrax AmMEGHINO, 1897. Ungulata, Hyracoidea, Archaeohyracide. 
La Argentina al través de las Ultimas Epocas Geológicas, 16, 1897 (nomen 
nudum); Bol. Inst. Geog. Argentino, X VIII, 435—456, fig. 20, Oct. 6, 1897. 
Species: Argyrohyrax proavus Ameghino, and A. proavunculus Ameghino, from 
the ‘Cretaceous’ of Patagonia. 
Extinct. 
Argyrohyrax: &py vpos, silver, i. e., La Plata; +Hyraz. 
Argyrolestes AMEGHINO, 1902. Marsupialia, Triconodontid:e. 
Bol. Acad. Nac. Cien. Córdoba, X VII, 48, May, 1902 (sep. p. 46). 
Type: Argyrolestes peralestinus Ameghino, from the Notostylops beds of Patagonia. 
Extinct. 
Argyrolestes: &pyvpos, silver, i. e., La Plata; Ayér1s, robber. 
