544 INDEX GENERUM MAMMALIUM. 
Platydelphis Du Bus, 1872. Cete, Platanistidze. 
Bull. Acad. Roy. Sci. de Belgique, 2* sér., XX XIV, No. 12, p. 498, 1872. 
Type: Delphinus canaliculatus Meyer, from Oberschwaben, Germany. (The frag- 
ments on which Du Bus based his genus came from the Lower Antwerp Crag, 
Belgium. ) 
Extinct. 
Platydelphis: mXarvs, broad, flat; deAgis, dolphin. 
Platygeomys Merriam, 1895. Glires, Geomyidee. 
N. Am. Fauna, No. 8, pp. 23, 26, 162-171, numerous pls. & figs., Jan. 31, 1895. 
Type: Geomys gymnurus Merriam, from Zapotlan, Jalisco, Mexico. 
Platygeomys: zAarvs, broad, wide; +-Geomys—in allusion to the great breadth of 
the cranium. 
Platydonus (see Platygonus). Ungulata, Artiodactyla, Tayassuidee. 
Piatygnathus Kroyer, 1841. Edentata, Megatheriide. 
Naturhist. Tidsskrift, Kjóbenhavn, III, 6te Heefte, 589-594, 1841. 
Type (species not named), from the Rio de La Plata, opposite Buenos Aires, about 
a mile northwest of Colonia del Sacramento, Uruguay. 
Name preoccupied by Platygnathus Dejean, 1834, a genus of Coleoptera. 
Extinct. Based on an imperfect right lower jaw. 
Platygnathus: mAarts, broad; yv aos, jaw. 
Platygonus (see Platigonus). Ungulata, Artiodactyla, Tayassuide. 
Platyodon Bnavanp, 1853. .Glires, Ochotonide. 
Bnavanp, in Pictet’s Traité Paléont., 2° éd., I, 258, 1853 (under Titanomys); 
Gervais, Zool. et Paléont. Francaises, 2"* éd., 50, 51, 1859 (under Titanomys 
visenoviensis); GIEBEL, Sáugethiere, 2d ed., 457 footnote, 1859; ZrrrEeL, Handb. 
Palaeont., IV, 2te Lief., 552, 1893. 
Type (species not mentioned), from the Miocene of Limagne, Dépt. Puy-de-Dóme, 
France. ‘‘Elles [les molaires supérieures] sont de méme forme que celles des 
dépóts miocénes de la Limagne, dont M. Croizet a fait le genre Marcuinomys 
et M. Bravard celui de Platyodon. J'en ignore le nombre." (GERVAIS. ) 
Name preoccupied by Platyodon Conrad, 1837, a genus of Mollusca. 
Extinct. 
Platyodon: tAatvs, broad; 66@v =660vs, tooth—in allusion to the upper molars. 
Platyodon (‘Reminnarpr’) Gervais, 1876. Edentata, Megatheriide. 
Gervais, Journ. de Zool., V, 1876, 73-74. 
Lapsus for Platygnathus Kroyer, 1841. The name occurs in a notice of Rein- 
hardt’s paper in the K. Danske Vidensk. Selsk. Skrifter, Kjóbenhavn, XI, 
p. 7, 1875. The only species mentioned is Platygnathus platensis Kroyer. 
Platyodon AwEcuriwNo, 1881. Edentata, Megatheriide. 
*La Antigüedad del Hombre en el Plata, II, 308, 1881" (fide AMEGHINO, Act. 
Acad. Nac. Cien., Córdoba, VI, 718, 1889 (under Diodomus annaratonet) ). 
Type: Platyodon annaratonei Ameghino, from the ‘Piso mesopotámico de la 
formación Patagónica, Argentina. 
Name preoccupied by Platyodon Conrad, 1837, a genus of Mollusca; and by 
Platyodon Bravard, 1853, a genus of Glires. (See Diodomus Ameghino, 1885). 
Extinct. Based on a single molar. 
Platyonyx Lunp, 1840. Edentata, Megatheriide. 
Ann. Sci. Nat., Paris, 2° sér., XIII, Zool., 311, 317-318, May, 1840; ‘‘Overs. 
Vidensk Selsk. Forhandlinger, Kjóbenhavn, 1840, 9;" Naturhist. Tidsskrift, 
Kjóbenhavn, III, 6te Heefte, 586-587, 1840-41; K. Danske Vidensk Selsk. 
Skrift., Kjóbenhavn, IX, 145, 1842. 
