556 



MUSEO NACIONAL DE BUENOS AIRES. 



Notophagus, 156, 160, 503. 



Notopithecus, 466. 



Notopithecus adapinus, 290. 



Notopristis, 186, 187. 



Notopristis patagónica, 183. 



Notostylops, 95, 98, 136; 348, 468, 470, 

 507. ' 



Notostylops (couches á, époque du), 23, 

 25, 36, 42, 43, 45, 63. 75, 76, 80, 81, 85, 

 87, 88, 93-99, 101, 103, 105, 108-112, 

 114, 115, 138, 140, 166, 167, 175, 206, 

 207, 215, 223, 294, 309, 320, 327, 348. 



Notostylops (faime du), 19, 24, 46, 61, 

 65, 80, 82, 83. 93, 95, 286, 289. 



Notosuchus, 69, 93, 94, 507. 

 Notosuchus terrestris, 94. 

 Nucleolites, 171. 

 Nucula, 57, 274. 

 Nucula dynastes, 50. 

 Nucula oblonga, 56. 

 Nucula patagónica, 123. 

 Nucula puelchana, 246. 

 Nucula reticularis, 123. 

 Nucula suboblonga, 57, 508, 511. 

 Nucula tricésima, 504. 

 Nyctinomus, 492. 

 Nyctipithecus, 491. 



O. 



Octodon, 241, 415. 



Octodontotherium, 471, 472, 474, 4S2. 



Octomylodon, 482. 



Oculina mississipiensis, 173, 174. 



Oculina Single3-i, 173, 174. 



Odontaspis, 186. 



Odontaspis Abbatei, 178, 184, 185, 505, 



519. 

 Odontaspis Bronni, 71, 185. 

 Odontaspis cuspidata, 177, 183, 184, 259, 



502, 519. 

 Odontaspis elegans, 185, 259, 463, 464, 



502. 

 Odontaspis Houzeaui, 71. 

 Odontaspis nonelegans, 183. 

 Odontaspis Rothi, 183. 

 Odontaspis Eutoti, 177, 184, 185, 505, 519. 

 Odontomysops, 468. 

 Ogmorhinus, 492. 



Oldñeldthomasia, 309-311, 467, 507. 

 Oldfieldthomasia furcata, 308. 

 Oldñeldthomasia transversa, 310. 

 Olenopsis, 241, 478, 481. 

 Oligobiotherium, 474, 505. 

 Oliva reticularis, 517. 

 Olivancillaria, 517. 

 Omegodus, 243. 

 Ommatophoca, 492. 

 Onohippidion, 486. 

 Onychodectes, 284. 

 Orea, 490. 

 Orchiomys, 472. 

 Orcinus, 490, 492. 

 Oroacrodon, 470. 

 Orophodon, 472, 506. 

 Orthoarthrus, 479. 

 Orthodolops, 468. 

 Orthodolops sciurinus, 367. 

 Orthomyctera, 485, 488, 490, 491. 



Orthomys, 481. 



Orthotherium, 482, 502. 



Orthutaetus, 468. 



Orj'cteropus, 374, 375, 440. 



Orycteropus afer, 370, 371, 373. 



Or^'zomys, 489-491. 



Ostrea, 163, 508. 



Ostrea Ameghinoi, 47, 48, 54, 55, 59,60, 



68, 77, 507. 

 Ostrea Ameghinoi var. rocana, 50, 51, 



123, 508. 

 Ostrea Alvarezi, 256, 258, 265, 266, 502. 

 Ostrea arbórea, 499. 

 Ostrea arcotensis, 56, 508. 

 Ostrea Bourgeoisi, 128, 129, 159-161. 

 Ostrea clarae, 50, 510. 

 Ostrea aff. clarae, 506. 

 Ostrea faira, 500. 

 Ostrea Ferrarisi, 247, 266, 271, 501. 

 Ostrea guaranitica, 43, 48, 54, 55, 59, 



61, 66, 68, 77, 97, 98, 506, 510. 

 Ostrea Hatcheri, 54, 55, 77, 119, 122, 



123, 126-128, 141, 143, 147, 150, 156, 



160, 504, 505, 510, 512. 

 Ostrea Hatcheri var. tehuelcha, 501. 

 Ostrea hemisphaerica, 43, 47, 50, 53, 



510. 

 Ostrea hemisphaerica var. capa, 50. 

 Ostrea hemisphaerica var. paca, 50. 

 Ostrea ingens, 128, 134-137, 141, 161, 



245, 276. 

 Ostrea madrj-na, 265i 266, 501. 

 Ostrea neuquena, 510. 

 Ostrea Orbignyi. 128, 136, 145, 147, 148, 



150,156,163,265,504. 

 Ostrea parasítica, 502, 517. 

 Ostrea patagónica, 128, 152, 153, 155 



160, 163, 247, 256, 265, 276, 277, 502. 

 Ostrea percrassa, 128. 



