FAQ INDEX GENERUM MAMMALIUM. 
Xyophorus Amecuino, 1887. Edentata, Megalonychid:e. 
Enum. Sist. Especies Mamít. Fós. Patagonia Austral, p. 23, Dec., 1887. 
Species: Vyophorus rostratus Ameghino, and X. simus Ameghino, from the lower 
Tertiary of southern Patagonia. 
Extinct. 
NXyophorus: $66, to scrape, to polish; oopós, bearing. 
Xyphodon (see Xiphodon). Ungulata, Artiodactyla, Anoplotheriid:e. 
2 ét 
Yak ? 1845. Ungulata, Artiodactyla, Bovid:e. 
London Encylopedia, XXII, 752, 1845 (art. Zoology). 
Yak is here used as a generic and not as a common name. The genus isdescribed 
in an unsigned article without mention of species, but is evidently based on 
Bos grunniens of Tibet. (See Poephagus Gray, 1843.) 
Yak: Tibetan, gyak, yak. 
Yarkea (subgenus of Pithecia) Lesson, 1840. Primates, Cebid:e. 
Spécies Mammiféres, 176-178, 1840; Nouv. Tableau Régne Animal, Mamm., 8, 
1842; RxrcHENBaACH, Vollstind. Naturgesch. Affen, 26-29, 1862 (raised to 
generic rank). 
Type: Simia leucocephala Audebert, from French Guiana. 
Yarkea: Yarké or yarqué, a native name of this monkey in French Guiana, pub- 
lished by Buffon, in 1789, on the authority of M. de la Borde, Médecin du 
Roi in Cayenne. ‘‘ M. de la Borde appelle yarqué cette méme espéce que nous 
avons appelée saki, et c'est peut-étre son véritable nom que nous ignorions." 
(Hist: Nat, Suppl; V. EL, 1132) 
Yerbua FonsrER, 1778. Glires, Dipodidee. 
K. Vetensk. Acad. Handlingar, Stockholm, X XXIX, 108-119, Tab. rir, Apr.—June, 
1778; SPARRMAN, ibid., 119-120, 1778 
Gerbua F. Cuvier, Dents Mammiféres, 254, 1825 (synonym of Helamys). 
Species, 8: Yerbua tarsata Forster, Y. sibirica Forster, Y. capensis Forster, Mus 
meridianus Pallas, Yerbua kanguru Forster, Mus longipes Linneeus, M. jaculus 
"allas (not Linnzeus), and M. sagitta Pallas. 
( Yerbua tarsata— Tarsius spectrum; Y. capensis= Pedetes caffer- and Y. kanguru= 
Mac; opus giganteus of modern authors. ) 
Yerbua (=Jerboa): **Arabic yarbi, the flesh of the back and loins, an oblique 
descending muscle . . . in reference to the strong muscles of the hind legs." 
(Century Dict., under Jerboa. ) 
v. 
Zaédyus AMEGHINO, 1889. Edentata, Dasypodidee. 
Cont. Conocimiento Mamít. Fósil. Repüb. Argentina, in Act. Acad. Nac. Cien. 
Córdoba, VI, 867-868, pl. Lxvuit figs. 45-50, 1889. 
Zaédypus LYDEKKER, Zool. Record for 1889, XXVI, Mamm ., p. 50, 1890. 
Zaédius LYDEKKER, Nat. Science, IV, 123, Feb., 1894. 
Type: Dasypus minutus Desmarest, from Port Desire, Patagonia. 
Zaédyus: Ca-, intensive particle; 79vs, pleasant, agreeable. 
Zaglossus Girr, 1877. Monotremata, Tachyglossidee. 
Ann. Record Science & Industry for 1876, p. elxxi, May 5, 1877;* Ann. Rept. 
Smithsonian Inst., for 1884, 642-643, 1885; Cours, Century Dict., I, 29, 1889 
(under Acanthoglossus); II, p. 1831, fig. under Echidnide, 1889; VI, p. 7028, 
1891; PALMER, Science, new ser., I, No. 19, pp. 518-519, May 10, 1895 (name 
nevnled) : 


* Date of publication from a let fter SEES Mar. 8, 1895, from Ee. & Bree , pub- 
lishers of the Record, 
