914 
Octodontide, 861. 
Octodontomys, 862. 
Octodontotherium, 819. 
Octotomus, 908. 
Ocypetes, 808. 
Odmaelurus, 840. 
Odobeenide, 833. 
Odobenide, 833. 
Odobenotherium, 8341. 
Odobenus, 834, 904. 
Odocerus, 929. 
Odocoileus, 924. 
Odontodorcus, 924. 
Odontomysopidae, 868. 
Odontomysops, 868. 
Odontostylus, 876. 
Oedipomidas, 891. 
CEdipus, 891. 
GEdocephalus, 849. 
CEgosceridz, 914. 
Ogmobalzena, 790. 
Ogmorhinine, 834. 
Ogmorhinus, 835. 
Ogotoma, 860. 
Okapia, 926. 
Olbodotes, 851. 
Oldfieldthomasia, 934. 
Olenopsis, 862. 
Olidosus, 930. 
Oligobiotherium, 884. 
Oligobunis, 825. 
Oligodens, 837. 
Oligoryzomys, 853. 
Oligotherium, 820. 
Oligotomus, 937. 
Oltinotherium, 929. 
Olygodon, 820. 
Omegodus, 868. 
Ommatophoca, 835. 
Ommatostergus, 867. 
Omomyne, 900. 
Omomys, 901. 
. Oncifelis, 828. 
Oncoides, 828. 
Ondatra, 856, 862, 951. 
Ondatrina, 861. 
Onohippidium, 937. 
Onotragus, 918. 
Ontocetus, 795. 
Onychodectes, 813, 
Onychogale, 840. 
Onychogalea, 883. 
Onychomys, 853. 
Onychotherium, 818. 
Onychura, 847. 
Oddectes, 840. 
Ophysia, 793. 
Opisthotomus, 901. 
Opistorinus, 935. 
Oplacerus, 924. 
Oplotherium, 913. 
Opolemur, 899. 
Opossina, 878, 879, 884. 
Opsiceros, 940. 
Oracanthus, 820. 
Oracodon, 788. 
Orasius, 926, 
INDEX GENERUM MAMMALIUM. 

Orca, 798, 795. 
Orcadee, 791. 
Orcaella, 793. 
Orchiomys, 868. 
Orcini, 791. 
Orcinus, 793. 
Orcopsis, 793. 
Oreamnos, 918. 
Oreas, 918. . 
Oreinomys, 859. 
Orenomys, 849. 
Oreocyon, 809. 
Oreodon, 912. 
Oreodontidz, 911. 
Oreomeryx, 936. 
Oreom ys, 859. 
Oreopithecus, 895. 
Oreotragus, 918. 
Orias, 918. 
Oritragus, 918. 
Ormenalurus, 828. 
Ornithodelphia, 780. 
Ornithorh ynchidae, 888. 
Ornithorhynchus, 888. 
Ornithoryncina, 885. 
Orohippus, 937. 
Oromeryx, 912. 
Oromys, 844. 
Orophodon, 821. 
Orophodontidae, 821. 
Orotherium, 924, 937. 
Orthaspitherium, 933. 
Orthocynodon, 936. 
Orthodolops, 788. 
Orthodon, 795. 
Orthogeniops, 906. 
Orthogenium, 906. 
Orthogeomys, 848. 
Ortholophodon, 911. 
Ortholophodontidae, 939, 941. 
Orthomyetera, 844. 
Orthomys, 562. 
Orthriomys, 856. 
Orthutaetus, 815. 
Ortotheride, 817. 
Ortotherium, 818. 
Orycteridez, 842. 
Orycterocetus, 795. 
Oryeteromys, 853, 862. 
Orycteropide, 822. 
Orycteropodide, 822. 
Oryeteropus, 822. 
Oryeterotherium, 817, 820. 
Oryeterus, 842. 
Oryctogale, 832. 
Oryetolagus, 850. 
Oryctomys, 848. 
Orygidz, 914. 
Orygotherium, 924. 
Oryx, 798, 918. 
Oryzomys, 853. 
Oryzorictes, 875. 
Oryzorictinee, 874. 
Oryzoryctid:e, 874. 
Osmetectis, 840. 
Osmotherium, 832. 
Osphranter, 883, 

Osteopera, 845. 
Otailurus, 828. 
Otaria, 834. 
Otariadze, 834. 
Otariid:e, 834. 
Otariina, 824. 
Otelaphus, 924. 
Othnielmarshia, 897. 
Otiphoca, 834. 
Otisorex, 873. 
Otocebus, 893. 
Otocolobus, 828, 866. 
Otocyon, 825. 
Otocyonide, 823. 
Otoes, 834. 
Otogale, 899. 
Otognosis, 849. 
Otolemur, 899. _ 
Otolienus, 825, 899. 
Otomyinz, 859. 
Otomys, 854, 859. 
Otonycteris, 808. 
Otopithecus, 895. 
| Otopterus, 802. 
| Otosciurus, 866. 

Otospermophilus, 866. 
Ototylomys, 853. 
Otronia, 906. 
Ouakaria, 893. 
Ouistitidze, 890. 
Ouistitis, 891. 
Oulodon, 796. 
Oulophocine, 834. 
Ourebia, 918. 
Ovibos, 918. 
Ovibovine, 914. 
Ovicaprina, 914. 
Ovide, 914. 
Ovifera, 926, 952. 
Ovis, 919. 
Owenia, 880. 
Oxacron, 913. 
Oxyacodon, 812. 
Oxy:ena, 810. 
Oxyenide, 810. 
Oxyeenodon, 810. 
Oxyclenide, 810. 
Oxyclenus, 811. 
Oxygomphius, 880. 
Oxygous, 825. 
Oxymyeterus, 853. 
Oxyodontherium, 935. 
Oxypterus, 796. 
Ox yrhin, 873. 
Oxyrhinus, 800. 
Oxystomus, 905. 
Ozanna, 919. 
Ozolictis, 832. 
Ozotoceras, 924. 
iP: 
Paca, 845. 
Pachochcerus, 929. 
Pachurus, 929. 
Pachyacanthinae, 904. 
Pachacanthus, 904. 
Pachyeena, 810. 
