556 INDEX GENERUM MAMMALIUM. 
Polygomphius— Continued. 
Polygomphius: moAvs, many; you@ios, molar—from the numerous teeth. The 
teeth vary in number but are usually 20-25 on each side and the total may 
reach 100, but as life advances the anterior ones fall out. 
Polymastodon Copr,* 1882. Allotheria, Plagiaulacide. 
Am. Naturalist, XVI, for Aug., 1882, 684—685, July, 1882; Tert. Vert., 732-733, 
pl. xxm° fig. 6, 1885 (date of publication). 
Type: Polymastodon taóensis Cope, from the Puerco Eocene of New Mexico. 
Extinct. ‘‘Known only from the inferior dentition.” 
Polymastodon: z0À)s, many; uaGrós, teat; 65@v=ddo0vs, tooth—in allusion to 
the numerous tubercles on the molars. 
Polymorphis Rorn, 1899. Tillodontia, Notostylopide. 
Revista Mus. La Plata, IX, 385-386, 1899; AwrcuHiwNo, Sin. Geol.-Paleont., 
Segundo Censo Nac. Repüb. Argentina, I, Supl. p. 12, July, 1899. 
Type: Polymorphis lechei Roth, from the Territory of Chubut, Patagonia. 
Extinet. Based on two lower jaws, one with the tooth row complete, the other 
with 5 molars. 
Polymorphis: zoAvuopdóos, multiform—in allusion to the combination of charac- 
ter exhibited by the teeth. ‘‘La dentadura reüne caractres de diversos 
órdenes."  (RorH.) 
Polypeutes (see Tolypeutes). Edentata, Dasypodid:e. 
[Polyptychodon Owen, 1841. Reptilia. 
Odontography, pt. rr, p. 19; Atlas, pl. 72 figs. 3, 4, 1841; Corr, Proc. Acad. Nat. 
Sei Phila., 1868, 185 (Cete); GirL, Arrangement Fam. Mamm., 93, Feb., 1872 
(Cete). 
A genus of Reptiles; but as used by Emmons (reference not found), the name was 
supposed by Cope and Gill to apply to a cetacean of the family Basilosauridz 
(=Zeuglodontide). **With respect to the genus Basilosaurus, it may be noted 
that the Polyptychodon interruptus of Emmons must be regarded as established 
on one of its canines. Whether the species be the D. cetoides must be left for 
their examination."  (CoPk.) 
Extinct. 
Polyptychodon: moAvs, many; zrv&, zrvyos, fold; 66@v=d6dovs, tooth. ] 
Pomatotherium (see Potamotherium). Ferze, Mustelide. 
Pongo Lac£PEDE, 1799. Primates, Simiide. 
Tabl. Mamm., 4, 1799; Nouv. Tableau Méth. Mamm., in Buffon’s Hist. Nat., 
Didot ed., Quad., XIV, 149, 1799; Mém. l'Institut, Paris, III, 490, 1801; Tre- 
DEMANN, Zoologie, I, 329, 1808; Grorrroy, Ann. Mus. Hist. Nat., XIX, 89,1812. 
Type: ‘Le Pongo adulte de Buffon,’ Pongo borneo Lacépéde, from Borneo. 
Name antedated by Simia Linnzus, 1758. 
Pongo: Said to be a native name in Borneo. (Century Dict.) 
Buffon, who used it in 1766, states that it is the native name for a West African 
ape in Loanda, a district of Angola. (Hist. Nat., XIV, 43, 1766.) 
It is also said to be ‘‘a corruption of Mpongwe, the name of a tribe on the banks 
of the Gaboon [River, West Africa], and hence, applied to the region they 
inhabit." (Savaczg, Boston Journ. Nat. Hist., V, 422, 1847.)+ 
Pongo Harecxkzr, 1866. Primates, Simiidz. 
Gen. Morphologie Organismen, II, p. cl, 1866; Hist. Creation, Am. ed., II, 275, 
1883. 

* Erroneously credited to ‘Kraatz, 1882,’ by C. O. Waterhouse, Index Zool., 299, 
1902. 
f The last two explanations evidently refer to the chimpanze and not to the 
orangutan. (See Pongo Haeckel.) 
