608 



Mus fossilis: 201. 



Mus laniger: 325. 



Mus longicaudatus: 202. 



Mus longitarsus: 202. 



Mus porcellus: 399. 



Mus rufus: 197. 



Mus vulpinus: 205. 



Mustela: 549. 



Mustela americana: 549. 



Mustela barbara: 542. 



Mustela Quiqui : 547. 



Mustelidae: 498, 541, 584. 



Mycetes: 179. 



Mycetes carayá: 179. 



Mycetes ursinus: 180. 



Mylodon: 11, 24, 70, 78, 80, 89, 91, 98, 102, 



104, 107, 109, 112, 113, 114, 120, 124, 125, 



132. 

 Mylodon robustus: 10, 120. 

 Mylodon Sauvagei: 113. 

 Mylodon Wieneri: 114. 

 Myomorpha: 189, 191. 

 Myopotamus: 219, 220, 224, 225, 229, 230, 231, 



232, 234, 235, 236, 237, 238, 241, 242, 244, 



245, 246, 248, 249, 252, 253, 254, 256, 257, 



258, 261, 262, 265, 266, 282, 293, 319, 329, 



33i, 332, 333, 359. 360. 

 Myopotamus antiquus: 231. 

 Myopotamus australis: 235. 

 Myopotamus bonariensis: 231. 

 Myopotamus castoroides: 231. 

 Myopotamus coypus: 80, 94, 104, 107, 229, 



231, 232, 233, 234, 235, 236, 254, 256, 259, 



261, 264. • 

 Myopotamus coypus fossilis: 231. 

 Myopotamus diligens: 235, 236. 

 Myopotamus paranensis: 234. 

 Myopotamus priscus: 113, 232, 233. 

 Myrmecobia: 585, 586. 

 Myrmecobius: 582, 586. 

 Mytilus: 77. 



N 

 Nasua: 498, 516, 528, 529, 530» 531, 532, 541. 

 Nasua brasiliensis: 541. 

 Nasua fusca: 528. 

 Nasua narica: 528. 

 Nasua rufa: 528. 

 Nasua socialis: 528, 541. 

 Nasua solitaria: 528, 541. 

 Nasua ursina: 541. 

 Natica Isabelleana: 77. 

 Necromys: 193, 211. 

 Necromys conifer: 211. 

 Nectomys: 213. 

 Nectomys squamipes: 213. 

 Nelomys: 289, 446. 

 Nelomys antricola: 264. 

 Nematherium: 46. 

 Neoepiblema: 292, 357, 362. 

 Neopiblema horridula: 357. 

 Neoplagiaulax: 456, 466, 467. 

 Neoprocavia: 364, 400, 401, 444, 445. 

 Neoprocavia mesopotamica: 401, 402. 



Neoracanthus: 39, 69. 



Neoracanthus Burmeisteri: 66, 67, 89, 126. 

 Neoracanthus platensis: 128, 129. 

 Neoreomys: 46, 230, 235, 237, 238, 241, 243 



252, 253, 258, 261, 265, 266. 

 Neoreomys australis: 238, 239, 240. 

 Neoreomys decisus: 240. 

 Neoreomys indivisus: 239, 240. 

 Neoreomys insulatus: 240. 

 Nesodon: 24, 28, 46, 56, 325, 327. 

 Nesodon ovinus: 325, 327. 

 Nesomys spinosus: 264. 

 Nesomys mordax: 264. 

 Neuryurus antiquus: 136. 

 Neuryurus rudis: 123. 

 Nocthora trivirgata: 180. 

 Noctilio: 589. 

 Noctilio affinis: 589. 

 Noctilio albiventer: 589. 

 Noctilio dorsatus: 589. 

 Noctilio leporinus: 589. 

 Noctilio mastivus: 589. 

 Noctilio ruber: 589. 

 Noctilio rufipes: 589. 

 Noctilio rufus: 589. 

 Noctilio unicolor: 589. 

 Nopachtus: 58, 136. 

 Nopachtus coagmentatus: 39, 60, 89. 

 Nycticejus: 590. 

 Nycticejus bonariensis: 590. 

 Nycticejus ruber: 590. 

 Nycticejus varius: 590. 

 Nyctinomus: 589. 

 Nyctinomus brasiliensis: 589. 

 Nyctinomus nasutus: 589. 

 Nyctipithecus: 180. 

 Nyctipithecus felinus: 180. 

 Nyctipithecus trivirgatus: 180. 

 Nyctiplanus rotundatus: 588. 



O 



Octocyon: 525, 527, 582. 



Octocyodontidae: 584. 



Octodon: 280, 288, 289, 290. 



Octodontidae: 214, 266, 272, 2B7, 288, 289, 



446, 447. 

 Olenopsis: 230, 252, 265, 266. 

 Olenopsis uncinus: 252, 254, 264. 

 Orea: 105. 

 Orthomyctera : 58, 364, 3^5. 372, 373, 374, 444, 



445- 

 Orthomyctera lacunosa: 135, 376. 

 Orthomyctera lata: 124, 375. 

 Orthomyctera rigens: 372, 375. 

 Orthomyctera vaga: 374. 

 Orthomys: 230, 261, 265, 266. 

 Orthomys dentatus: 261, 263. 

 Orthomys procedens: 262. 

 Orthomys resecans: 263. 

 Ostrea: 43, 64, 89. 

 Ostrea Alvarezi: 53. 

 Ostrea Ferrarisi: 28, 39, 49, 89. 

 Ostrea patagónica: 28, 39, 43, 47, 49, 5 2 , 53> 



54, 89. 



