580 INDEX GENERUM MAMMALIUM. 
Prothomo AMEGHINO, 1884. Primates, "n 
Filogenia, 380, 1884; Cont. Conocimiento Mamíf. Fósil. Repüb. Argentina, in 
Act. Acad, Nac. Cien., Córdoba, VI, 96, 1889. 
Hypothetical genus defined to show the probable evolution of man. ‘‘ Podemos 
igualmente designar con nombres genéricos propios cada una de los antecesores 
restaurados . . .  Prothomo 6 primer antecesor del hombre." (AMEGHINO. ) 
Prothomo: ap@cvos, first; + Homo. 
Prothylacynus AmMEGHINO, 1891. Marsupialia, Borhyeenide. 
Nuevos Restos Mamif. Fos. Patagonia Austral, 26, Aug., 1891; Revista Argentina 
Hist. Nat., I, entr. 5a, 312, Oct. 1, 1891. 
Type: Prothylacunuspatagonicus Ameghino, from the Eocene of southern Patagonia. 
Extinct. 
Prothylacynus: 2p, before; +- Thylacynus. 
Prothylobates AMEGHINO, 1884. Primates, ? 
Filogenia, 381, 1884; Cont. Conocimiento Mamíf. Fósil. Repub. Argentina, in 
Act. Acad. Nac. Cien., Cordoba, VI, 98, 1889. 
Hypothetical genus: ‘ Antecesor del gibdn.’ 
Prothylobates:: mp@tos, first; +-Hylobates. 
Prothyracodon Scorr & OsBoRN, 1887. Ungulata, Perissodactyla, Hyracodontide. 
Proc. Am. Philos. Soc., XXIV, No. 126, p. 260, Nov. 2, 1887; OsBorn, Trans. 
Am. Philos. Soc., XVI, pt. 111, 524—526, pl. x1 fig. 6, Aug. 20, 1889. 
Type: Prothyracodon intermedium Scott & Osborn, from the Eocene (Uinta beds) 
of White River, northeastern Utah. 
Extinct. Based on ‘a fragment of the superior maxillary containing the fourth 
premolar and second molar in place, with the alveolus of the first molar.’ 
Prothyracodon: zp&ros, first, 4- Hyracodon. 
Protitanotherium Harcuer, 1895. Ungulata, Perissodactyla, Titanotheriid:e. 
Am. Naturalist, X XIX, 1084, pls. xxxvii figs. 1-4, xxxix fig. 3, fig. 2 in text, 
Dec., 1895. : 
Type: Diplacodon emarginatus Hatcher, from the upper Eocene (base of the 
Diplacodon elatus beds of Osborn) of ‘Kennedy Hole,’ about 8 miles north of 
White River and 25 miles east of Ouray Indian Agency, Uinta County, Utah. 
Name provisionally proposed ‘‘should future discoveries show that there are 
hornless forms with the same dental characters as Diplacodon." 
Extinct. Based on a skull with lower jaw (No. 11242, Coll. Princeton College). 
Protitanotherium: 70, before; +-Titanotherium. 
Protoadapis LEwoixE, 1878. Primates, Plesiadapidee. 
** Bull. Soc. Hist. Nat. Reims, 101, 1878" (fide TRovEssaART, Cat. Mamm., new ed., 
75, 1897); Ass. Francaise Avancement Sci., Compte Rendu 8* sess., Montpellier, 
for 1879, 587-588, 1880; Bull. Soc. Géol. de France, 3* sér., XIX, No. 5, p. 281, 
pl. x figs. 71-78, May, 1891. 
Species, 4: Protoadapis copei Lemoine, P. crassicuspidens Lemoine, P. recticuspidens 
Lemoine, and P. curvicuspidens, from the lower Eocene near Reims, France 
(1880). 
Extinct. Based on teeth. 
Protoadapis: mp@cvos, first; -|- Adapis. 
Protobaleena Du Bus, 1867. Cete, Balzenidee. 
Bull. Acad. Roy. Sci. de Belgique, 2° sér., X XIV, 573, 1867. 
Probalena VAN BENEDEN, Ibid., 2° sér., XXXIV, 10-11, 1872. 
Type species not mentioned by Du Bus. Van Beneden, in 1872, gave Probalena 
dubusti, based on remains from the Antwerp Crag, Belgium. 
Extinct. 
Protobalena: mp@cos, first; 4+-Balena., 
