PERAMYS—PERIDERMA. 593 
Peramys-— Continued. 
Species, 4: Peramys brachyurus (= Didelphys brachyura Schreber— D. brevicaudata 
Erxleben, type), from Brazil; P. crassicaudata ( Desmarest), from Paraguay; 
P. tristriata (Illiger), from Brazil; and P. pusilla ( Desmarest), from Paraguay. 
Peramys: mHpa, pouch; j4/£0s , mouse—i. e., a pouched rat. 
Perascalops (see Parascolops.) Insectivora, Talpid:e. 
Peraspalax Owen, 1871. Marsupialia, Amphitheriidee. 
Mesozoic Mamm., in Mon. Palzeontograph. Soc., XXIV [No. 5], 40-41, pl. 11 
figs. 9, A—B, 1871. 
Type: Peraspalax talpoides Owen, from the Purbeck of Durdlestone Bay, Swa- 
nage, Dorsetshire, England. 
Extinct. Based on a part of the left mandibular ramus. 
Peraspalax: mhpa, pouch; dóz&Aa&£, mole. 
Perathereutes AMEGHINO, 1891. Marsupialia, Borhyzenidee. 
Nuevos Restos Mamíf. Fós. Patagonia Austral, 27-28, Aug., 1891; Revista Argen- 
tina Hist. Nat., I, entr. 5a, 313-314, Oct. 1, 1891. 
Peratheutes LypEKKER, Hand-Book Marsup. & Monotrem., 269, 1894. 
Species, 3: Perathereutes pungens Ameghino, P. obtusus Ameghino, and P. ampu- 
tans Ameghino, from the lower Eocene of southern Patagonia. 
Extinct. 
Perathereutes: m)pa, pouch; §ypevrns, hunter—i. e., a carnivorous marsupial. 
Peratherium Aymarp, 1850. Marsupialia, Didelphyid:e. 
Ann. Soc. Agr., Sci, Arts et Comm. du Puy, XIV, 81, 83-84 footnote, 1850; 
Gervais, Zool. et Paléont. Francaises, 2° éd., 267, 1859. 
Perotherium Wixag, E Museo Lundi, 1895, 124. 
Species, 3: Peratherium elegans Aymard (=P. bertrandi Gervais), JP. crassus 
Aymard, and P. minutus Aymard, from the Miocene of Ronzon, near Puy- 
en-Velay, Dépt. Haute-Loire, France. 
Extinct. 
Peratherium: za, pouch; 07ptov, wild beast—i. e., a marsupial. 
Percherus Lripy, 1869. Ungulata, Artiodactyla, Suid? 
Journ. Acad. Nat. Sci. Phila., 2d ser., VII, 194-197, 389, pl. xxi figs. 20-27, 1869. 
Type: Palxocherus probus Leidy, from the Oligocene of the Bad Lands of White 
River, South Dakota. 
Extinct. 
Percherus: wept, around, near; yozpos, hog. 
Perea (subgenus of Cavia) Luxp, 1840. Glires, Caviidee. 
Echo du Monde Savant, 7° ann., No. 528, p. 191, Apr. 4, 1840. 
Nomen nudum. ‘‘Le genre Cavia, de Linné, ne manque pas non plus de repré- 
sentants dans cette faune antédiluvienne; les sous-genres Perea et Moco ont été 
trouvés." 
Peribos LvpEkxkER, 1876. Ungulata, Artiodactyla, Bovide. 
Records Geol. Surv. India, IX, pt. 3, p. 90, Aug., 1876; Mem. Geol. Survey 
India (Palzeontologia Indica), ser. 10, I, pt. rrr, 141-145, 174-176, pls. xx, xxr 
fig. 2 [reissue, pls. xx, xx1], 1878. 
Type: Hemibos occipitalis Falconer, from the Siwalik Hills of Ganawur, India. 
Extinct. Based on a single cranium. 
Peribos: £pi, around, near; -+Bos. 
Periderma (‘Gervais’) ManscuaLL, 1878. Chiroptera, Phyllostomatid:e. 
ManscHaALL, Nomenclator Zool., Mamm., 10, 1873. 
Apparently a misprint for Pteroderma Gervais. Marschall refers Periderma to 
Expd. du Comte de Castelnau, but the name is not found in this work, while 
Pteroderma occurs in Vol. I, pt. 11, pp. 34-35. 
