586 



MUSEO NACIONAL DE BUENOS AIRES. 



Aptyxis, 195. 



Arca, 5, 231, 237, 426, 428, 485, 492, 499, 



501, 502, 506, 535. 

 Arca Aldrichi, 231. 

 Arca americana, 449. 

 Arca bicors, 425, 449. 

 Arca bisulcata, 425, 427, 448. 

 Arca Bonplandiana, 356, 357, 360 372. 

 Arca camaronesia, 102, 238, 239. 

 Arca campechiensis, 425, 449. 

 Arca candida, 238. 

 Arca Chemnitzi, 239, 449. 

 Arca cunealis, 78. 

 Arca Darwini, 102, 108, 233, 237. 

 Arca decussata, 85. 

 Arca despecta, 77. 

 Arca imbricata, 77, 78. 

 Arca indica, 449. 

 Arca juliana, 102, 108, 238. 

 Arca Kraussi, 78. 

 Arca lyrata, 872. 

 Arca maculata, 78. 

 Arca Martlni, 448. 

 Arca noee, 71, 530, 532. 

 Arca patagónica, 71, 77, 236. 

 Arca platensis, 357, 372. 

 Arca reticulata, 523. 

 Arca taeniata, 231. 

 Arca umbonata, 34, 71, 73, 77, 78, 102, 



108, 114, 236, 237, 486, 491, 532, 544, 558. 

 Arca umbonata patagónica, 237. 

 Arca ventricosa, 77, 237. 

 Archidoris, 503. 

 Arsbidoris kerguelensis, 547. 

 Archidoris tuberculata, 547. 

 Argobuccinum 174, 176,509,510,525, 526. 



Argobuccinum argus, 174, 497, 509, 511, 



520. 

 Argobuccinum cancellatum, 174, 509, 



526, 558. 

 Argobuccinum cancellatum oregonen- 



sis, 558. 

 Argobuccinum oregonense, 509. 

 Argobuccinum proditor, 509. 

 Argobuccinum vexillum, 174, 509. 

 Argonauta argos, 511. 

 Argonavita tuberculata, 511, 534 

 Artemis laeviuscula, 300. 

 Arthrochlamys, 251. 

 Aspella, 548. 

 Astarte, 51, 502, 506. 

 Astralium, 124. 

 Astrapotherium magnum, .54. 

 Atrina, 242, 499, 505. 

 Atrina distans, 85. 

 Atrina Listeri, 242. 

 Atrina magellanica, 102, 106, 242. 

 Atrina patagónica, 242. 

 Atrina zealandica, 85. 

 Aturia Caroli-Ameghinoi, 96, lOí!, 108, 



116. 

 Aturia zic-zac australis, 85, 91. 

 Aulocomya, 270, 272. 

 Austrocominella, 190, 314. 

 Austrocominella cepa, 344. 

 Austrocominella opima, 344. 

 Austrocominella retusa, 344. 

 Austrocominella Smithi, 344. 

 Azara, 4.59. 



Azara labiata, 352, 388, 458, 462. 

 Azara prisca, 429. 



B. 



Baculites, 74. 



Balanus, 14. 



Barbatia, 79, 231, 234, 236, 238, 372,484, 



502. 

 Barnea, 329. 



Barnea costata, 329, 507. 

 Barnea lamellosa, 329. 

 Barnea lanceolata, 329, 389, 423, 53S. 

 Barnea lanceolata ornata, 358, 360. 

 Barnea ornata, 389. 

 Barnea paucispina, 105, 109, 329. 

 Bathymophila, 549. 

 Bella, 502. 



Bella Cunningliami, 218. 

 Bittium, 361, 367, 426, 502, .504. 

 Bittiuvn lima, 532. 



Bittium textura, 357, 367. 



Borsonia, 79, 219, 501. 



Borsonia patagónica, 101, 109, 221. 



Borus, 463. 



Bouchardia, 471-473. 



Bouchardia patagónica, 75, 470, 480, 



489. 

 Bouchardia patagónica jorgensis, 470, 



480. 

 Bouchardia rosea, 471, 481. 

 Bouchardia transplatina, 356, 470, 480, 



481. 

 Bouchardia Zitteli, 75, 470, 480. 

 Brachydontes, 269, 270, 272, 505. 

 Brachydontes aff. domingensis 420. 

 Brachydontes andina, 103, 274. 



