576 INDEX GENERUM MAMMALIUM. 
Prosinopa—Continued. 
Extinct. Based on part of a lower jaw containing the third and fourth pre- 
molars. 
Prosinopa: mo, before; + Sinopa. 
Prosotherium AMEGHINO, 1897. Ungulata, Typotheria, Hegetotheride. 
La Argentina al través de las Ultimas Epocas Geológicas, 7, 17 footnote, 1 fig. in 
text, 1897; Bol. Inst. Geog. Argentino, X VIII, 426-427, fig. 12, Oct. 6, 1897. 
Species, 3: Prosotherium garzoni Ameghino, P. triangulidens Ameghino, and P. 
robustum Ameghino, from the ‘Cretaceous’ of Patagonia. 
Extinct. 
Prosotherium: z006c, forward, well in advance; §7piov, wild beast. 
Prospaniomys AMEGHINO, 1902. Glires, Octodontide. 
[Anal. Soc. Cien. Argentino, LI, Mar.-Apr., 77, 1901—subgenus of Spaniomys, 
nomen nudum. ] 
Bol. Acad. Nac. Cien. Córdoba, XVII, 113-114, May, 1902 (sep., pp. 45-46). 
Type: Prospaniomys priscus Ameghino, from the Eocene of Patagonia. 
Extinct. 
Prospaniomys: 70, before; + Spaniomys. 
Prosqualodon LvpbrEkkEn, 1894. Cete, Squalodontid:e. 
Nat. Science, IV, No. 24, p. 125, Feb., 1894; Anal. Mus. La Plata, Paleont. 
Argentina, II, for 1893, art. No. 11, 8-10, pl. rv, Apr., 1894.* 
Type: Prosqualodon australis Lydekker, from the Territory of Chubut, Patagonia. 
Extinct. Based on an imperfect skull with teeth. 
Prosqualodon: z0, before; -+Squalodon. 
Prostegotherium AMEGHINO, 1902. Edentata, Dasypodidz (Stegotheriidz). 
Bol. Acad. Nac. Cien. Córdoba, XVII, 69, May, 1902 (sep. p. 67). 
Species: Prostegotherium notostylopianum Ameghino, and P. astrifer Ameghino, 
from the Notostylops beds of Patagonia. 
Extinct. 
Prostegotherium: 70, betore; + Stegotherium. 
Prostrepsiceros Forsytu Masor, 1891. Ungulata, Artiodactyla, Bovidz. 
Comptes Rendus, Paris, CXIII, No. 18, pp. 608, 609, Séance Nov. 2, 1891. 
Type: Prostrepsiceros woodwardi Forsyth Major, from the upper Miocene of the 
island of Samos, Grecian Archipelago. (The genus is also found near Maragha, 
Persia. ) 
Extinct. 
Prostrepsiceros: 70, before; +-Strepsiceros. 
Prostylophorus Roru, 1901. Ungulata, Condylarthra? Phenacodontidz? 
Revista Mus. La Plata, X, 252, Oct., 1901 (sep. p. 4). 
Type: Prostylophorus margeriei Roth, from the upper ‘Cretaceous’ of Patagonia. 
Extinct. 
Prostylophorus: z00, before; +Stylophorus. 
Prostylops AMEGHINO, 1897. Ungulata, Ancylopoda, Isotemnidze. 
La Argentina al través de las Ultimas Épocas Geológicas, 16 footnote, 1897 
(nomen nudum); Bol. Inst. Geog. Argentino, X VIII, 486, Oct. 6, 1897. 
Type: Prostylops typus Ameghino, from the ‘Cretaceous’ of Patagonia. 
Extinct. 
Prostylops: 0, before; 6rbAos, pillar; oy, aspect. 


*For date of publication, see Ameghino, Revista Jardín Zool. Buenos Ayres, II, 
193 footnote, July 15, 1894. 
