694 INDEX GENERUM MAMMALIUM. 
Triprothomo AwxranrNo, 1884. Primates, ? 
Filogenia, 381, 1884; Cont. Conocimiento Mamif. Fósil. Repüb. Argentina, in 
Act. Acad. Nac. Cien., Córdoba, VI, 97-98, 1889. 
Hypothetical genus defined to show the probable evolution of man. ‘‘ Tercer 
antecesor del hombre." 
Triprothomo: rpi-, three; mp@ros, first; + Homo. 
Triprotosimia AMEGHINO, 1884. ] Primates, ? 
Filogenia, 383, 1884; Cont. Conocimiento Mamíf. Fósil. Repub. Argentina, in 
Act. Acad. Nac. Cien., Córdoba, VI, 98, 1889. 
Hypothetical genus— Tercer antecesor del orangutan.’ 
Triprotosimia: rpi-, three; mp@ros, first; +-Simia. 
Triprotroglodytes AmEGHINo, 1884. Primates, T 
Filogenia, 384-385, 1884; Cont. Conocimiento Mamíf. Fósil. Repüb. Argentina, 
in Act. Acad. Nac. Cien., Córdoba, VI, 99, 1889. 
Hypothetical genus— ' Tercer antecesor del gorilla y el chimpancé.' 
Triprotroglodytes: tpi-, three; mp0, before; + Troglodytes. 
Trirhizodon Corr, 1890. Cete, Squalodontidee. 
Am. Naturalist, X XIV, No. 283, p. 603, July, 1890. 
Type not mentioned. Includes species having ‘‘some of the posterior superior 
molars three rooted." 
Extinct. 
Trirhizodon: rpi-, three; Gila, root; d6@v=ddovs, tooth—in allusion to the 
upper molars. 
Trispondylus Corr, 1884. Ungulata, Condylarthra, Phenacodontid:e. 
Am. Naturalist, XVIII, No. 9, p. 900 footnote, figs. 20, 21, Sept., 1884 (provi- 
sional name). 
Type: Phenacodus vortmanni (= Hyracotherium vortmanni Cope), from the Eocene 
Bad Lands of Wind River, Wyoming. 
Extinct. Based on portions of four mandibles. 
Trispondylus: rpi-, three; 6zóvóvAÀos, vertebra—in allusion to the presence of 
three sacral vertebr:e, instead of four as in Phenacodus primexvus. 
Tritomodon Corr, 1882. Marsupialia, Macropodid:e? 
Am. Naturalist, X VI, 521, June, 1882; Tert. Vert., 169, 1885. 
Name proposed for a theoretical or fictitious genus. ‘‘We must therefore 
regard Hypsiprymnus as the descendant of a type from which the Plagiaulacide 
were also derived . . . Such a type would belong to Jurassic and perhaps 
even to Triassic times, and might well have continued to the Eocene. I call 
it provisionally by the name Tritomodon.’’? | (CoPk.) 
Extinct. 
Tritomodon: rpi-, three; rouós, cutting; 65@v=d6ovs, tooth—in allusion to the 
supposition that ‘‘some of the premolars, as far as the third only, were 
trenchant."' 
Tritylodon Owen, 1884. Allotheria? Tritylodontid:e. 
Quart. Journ. Geol. Soc. London, XL, pt. 1, No. 157, pp. 146-152, pl. vr figs.1-7, 
Feb. 1, 1884; SEErLEv, Proc. 4th Int. Congress Zool., 68, 1899 (considered a 
reptile). 
Type: Tritylodon longxvus Owen, from the Trias of Thaba-Chou, Basuto Land, 
southeast of the Orange Free State, South Africa. 
Extinct. Based ona ‘skull. . . lacking the hinder cranial end and the man- 
dible, but retaining with the upper jaw its dentition, though many of the teeth 
are more or less mutilated.’ * 
Tritylodon: rpi-, three; tTUAOs, knob; 66@v=déo0vs, tooth—in allusion to the 
trituberculate ridges of the upper molars. 
*“T believe that what remains of the skull goes to show that Tritylodon was a reptile, 
and that the skull might be restored upon the Theriodont plan."  (SkEELEv, Phil. 
Trans. Roy. Soc. London, for 1894, vol. 185, pt. 11, p. 1027, 1895.) 

