-Y 
OPISTORINUS—ORACANTHUS, 47 
Opistorinus—Continued. 
Species: Opisthorhinus falconerii Bravard (type?), and O. minus Bravard, from the 
vicinity of Buenos Aires, Argentina. 
Extinct. 
Opistorinus: ómi60cv, behind; (is, Ó:vóc, nose—in allusion to the posterior 
position of the nares. 
Oplacerus HarpEMaAN, 1842. Ungulata, Artiodactyla, Cervidz. 
Proc. Acad. Nat. Sci. Phila., I, 188, 1842. 
New name for Mazama H. Smith, 1827, which is preoccupied by Mazama Rafin- 
esque, 1817—a different genus of the same family. (See Odocoileus Rafinesque, 
1832.) 
Oplacerus: Oma, arms; Képas, horn. 
Oplolemur (see Opolemur). Primates, Lemurid:e. 
Oplotherium Laizer & Parrev, 1838. Ungulata, Artiodactyla, Anoplothertidee. 
Echo du Monde Savant, IV, No. 371, pp. 276-277, Sept. 22, 1838; V, No. 402, p. 
20, Jan. 9, 1839; Ann. Sci. Nat., Paris, 2° sér., X, Zool., 335-342, pl. 9, Dec., 
1838; PInstitut, VII, 3, 1839. 
Hoplotherium Meyer, Neues Jahrb. Mineralogie, 1841, 461; AGAssiz, Nomenclator 
Zool., Mamm., 15, 1842; Index Univ., 1846, 186; 1848, 535. 
Species: Anoplotherium laticurvatum Geotfroy, and Oplotherium leptognathum Laizer 
& Parieu, from Puy-de-Dóme, France. 
Extinct. 
Oplotherium: OzAov, arms; 09píov, wild beast—in allusion to the canines, which 
are not reduced to the level of the molars as in Anoplotherium. In Oplotherium 
** les canines dépassent la ligne formée par les pointes des molaires. Elles sont 
armées d'une petite haste un peu recourbée à leur sommet. (Laizer & PARIEU. ) 
Opolemur Gnav, 1872. Primates, Lemurid:e. 
Proc. Zool. Soc. London, 1872, 853-855, fig. 1, pl. xx; FonaEs, Hand-book Pri- 
mates (Allen’s Nat. Lib.), I, 61-63, 1894. 
Oplolemwr C. O. W ^rERHOUSE, Index Zool., 254, 1902 (misprint). 
Type: Cheirogaleus milii Geoffroy, from ois Madagascar. 
Opolemur: 670s, juice, sap—i. e., fat; -- Lemur — in allusion to the thickened base 
of the tail, which was very conspicuous in the type specimen. This character 
has suggested the term ‘fat-tailed lemurs’ for the group, but is now known to 
be merely seasonal and not confined to this genus. 
Opsiceros GrocEn, 1841. Ungulata, Perissodactyla, Rhinocerotid:e. 
Hand- u. Hilfsbuch Naturgesch., I, pp. xxxii, 125-126, 1841; exco 
Pachydermen, 12, 1846; THomas, Ann. & Mag. Nat. Hist., 6th ser., XV, 191, 
192, Feb. 1, 1895. 
Species: Rhinoceros bicornis Linnzeus (type), and A. simus Burchell, from Africa. 
Opsiceros: ow, face; Képas, horn—in allusion to the nasal horns. 
Oracanthus AwEanriNo, 1885. Edentata, Megatheriide. 
Bol. Acad. Nac. Cien. Córdoba, VII, entr. 4a, 499-504, lám. r, 1885; Act. Acad. 
Nac. Cien., Córdoba, VI, 673-677, 1889 (under Neoracanthus). 
Type: QE DEUS Ameghino, from the vicinity of Villa de Lujan, on 
the Rio Lujan, Argentina. 
Name preoccupied by Oracanthus Agassiz, 1837, a genus of Pisces. Replaced by 
Neoracanthus Ameghino, May 20, 1889, and by Ocnobates Cope, Aug., 1889. 
Extinct. Based on a lower jaw. 
Oracanthus:* Opos, mountain, hill, ridge; &cav6a, spine—‘ 4 causa de las cüspi- 
des puntiagudas y punzantes que forman las esquinas de la arista 6 colina 
transversal posterior de cada una de las muelas." (AMEGHINO, l. c., 1889, 674.) 


*In a few instances (as in Oracanthus, Oracodon, ete.) compounds of dpos, moun- 
tain, are used to indicate characters of the teeth, but in most cases such compounds 
refer simply to the animal's mountain habitat and require no special explanation. 
