542 INDEX GENERUM MAMMALIUM. 
Platacanthomys DrvrH, 1859. Glires, Muscardinid:e. 
Journ. Asiatie Soc. Bengal, Calcutta, X XVIII, 288-289, 1859. 
Platyacanthomus Ma^nscnALuL, Nomenclator. Zool., Mamm., 10, 1873. 
Platyacanthomys Cours, Century Dict., IV, p. 4536, 1890 (under Platacanthomys). 
Type: Platacanthomys lasiurus Blyth, from Mundakyum, Alipi, southern Mala- 
bar, India. 
Platacanthomys: tats, broad, flat ;* akavga, spine; “0s, mouse—in allusion 
to the flattened spines mingled with the fur. 
Platacodon Marsn, 1889. Marsupialia, Stagodontid:e. 
Am. Journ. Sci. & Arts, 3d ser., XX XVIII, 178, pl. vri figs. 4-12, Aug., 1889. 
Type: Platacodon nanus Marsh, from the Cretaceous ( Laramie) of Wyoming. 
Extinct. Based on ‘‘the three teeth represented on pl. vu, figs. 4-12." 
Platacodon: mAarvs, broad, flat; d»), point; d66v=ddovs, tooth—in allusion 
to the crowns of the premolars. 
Plataéomys AwkaniNo 1881. Glires, Octodontide. 
*La Antigüedad del Hombre en el Plata, II, 306, 1881" (fide AwEGurNo, 1889); 
Cont. Conocimiento Mamíf. Fósil. Repüb. Argentina, in Act. Acad. Nac. Cien., 
Córdoba, VI, 161-162, pl. vir figs. 9, 10, 1889. 
Type: Plataeomys scindens Ameghino, from the Rio de la Plata, Province of Buenos 
Aires; subsequently found at Monte Hermoso, about 40 miles east of Bahia 
Blanca, Argentina. 
Extinct. 
Plataéomys: Plata (from Rio de la Plata); + Homys—i. e., the ‘La Plata Komys.’ 
Platanista WacaLER,T 1830. Cete, Platanistide. 
Nat. Syst. Amphibien, 35, 1830; Gray, Ill. Indian Zool., II, pl. 24, 1833-34; 
ANDERSON, Anat. & Zool. Researches, Yunnan Expd., I, 417, 550, pls. xxv, 
etc., 1878. 
Platanistina Gray, Zool. Voy. H. M. 8. ‘Erebus & Terror,’ Mamm., 45, 1846. 
Type: Delphinus gangeticus Lebeck, from the River Ganges, India. 
Platanista: zÀ«raviórns, ‘‘a fish of the Ganges, apparently this dolphin." 
(Century Dict.).  ‘‘ Probablement le platanista de Pline." (Cuvisr.) 
Platanistina Gray, 1846. Cete, Platanistidee. 
Zool. Voy. H. M. 8. ‘Erebus & Terror,’ Mamm., 45, 1846. 
Modification of Platanista Wagler, 1830. 
Platatherium Gervais & AMEGHINO, 1880. Ungulata, Artiodactyla, k 
Mamm. Foss. Am. Sud, 130-133, 1880; AwEaniNo, Act. Acad. Nac. Cien., Cór- 
doba, VI, 615-616, 1889. 
Type: Platatherium magnum Gervais & Ameghino, from the Province of Buenos 
Aires, Argentina. 
Extinct. Based on a ‘portion of the left lower mandible, some bones of the 
limbs, and a fragment of the pelvis.’ 
Platatherium: Plata (from the Rio de La Plata); 67piov, wild beast. 
Platigonus Lr Contr, 1848. Ungulata, Artiodactyla, Tayassuide. 
Am. Journ. Sci. & Arts, 2d ser., V, No. 13, pp. 103-104, figs. 1, 2, Jan., 1848. 
Platydonus Lg Contr, Mem. Am. Acad. Arts & Sci., new ser., III, 257, 1848. 
Platygonus Giuu, Arrangement Fam. Mamm., 83, Feb., 1872. 
Type: Platigonus compressus Le Conte, from the Pleistocene of the lead region of 
Illinois. : 
Extinct. 
Platigonus: tXatvs, broad, flat; y «vía, angle—‘‘from the curious dilatation of 
the angle of the inferior maxilla, which is produced into a large and broad 
expansion, concave outwards." (LE CowmE.) 

* The application of the prefix Platy-, broad or flat, usually requires no explanation. 
T In the reference quoted by Anderson and others—Cuvier, Rechérches Oss. Foss., 
nouv. ed., V, 279-280, pl. 22, figs. 8-10, pl. 23, fig. 19, 1823—the name occurs only 
in French form, ‘Dauphin du Gange." 
