596 



MUSEO NACIONAL DE BUENOS AIRES. 



Magellania grávida, 472, 476, 477. 

 Magellania insólita, 476. 

 Magellania kerguelensis, 477. 

 Magellania lenticularis, 474, 475, 477. 

 Magellania macrostoma, 471, 477. 

 Magellania novara, 472, 474, 475. 

 Magellania ovalis, 476. 

 Magellania Parcki, 476, 

 Magellania patagónica, 470-472, 476, 477. 

 Magellania patagónica paliqueana, 477. 

 Magellania venosa, 471, 472, 474, 475, 



477, 479. 

 Manatus, 34. 

 Mangilia, 219, 502, 504. 

 Mangilia Coppingeri, 218. 

 Mangilia hyemalis, 218. 

 Malletia, 30, 79, 92, 228, 498, 505. 

 Malletia aff. prunum, 359, 870. 

 Malletia angustata, 535. 

 Malletia australis, 102, 106, 228, 490. 

 Malletia buUata, 536. 

 Malletia confinis, 200. 

 Malletia olivella, 197. 

 Malletia oliviformis, 197. 

 Malletia ornata, 4, 30, 31, 75, 79, 102, 106, 



108, 228, 489, 490. 

 Malletia patagónica, 200. 

 Malletia plicifera, 200. 

 Malletia prunum, 196, 197, 422, 533. 

 Malletia pruniformis, 357, 359, 370. 

 Malletia quemadensis, 199. 

 Marcia, 297, 505. 

 Marcia arenosa, 333, 350. 

 Marcia difficilis, 333, 350. 

 Marcia exalbida, 104, 297, 298, 304, 419, 



454. 

 Marcia navidadis, 304, 305. 

 Marcia Ortmanni, 104, 109, 304, 305. 

 Marcia scutata, 104, 108, 293, 303-305, 



350. 

 Marcia striatolamellata, 104, 109, 302, 



304, 305. 

 Margaren a, 442. 

 Margarita, 126, 364, 548. 

 Margaritas, 126, 127, 504, 508, 512, 548, 



549. 

 Margarites cónica, 126. 

 Margaritas dilecta, 126. 

 Margarites infundibulum, 549. 

 Margarites magellanica, 126. 

 Margarites trophameli, 126. 

 Margaritifera, 505. 

 Marginella, 71, 91, 196, 198, 361, 499, 



529, 540. 

 Marginella bella, 71. 



Marginella dubia, 86. 



Marginella gracilis, 71, 200. 



Marginella venti-icosa, 87. 



Marsenia, 504. 



Marseniopsis, 504. 



Martesia, 329, 499. 



Martesia patagónica, 105, 108, 267, 330, 



335, 358, 361, 389. 

 Martesia pumila, 105, 331. 

 Martesia striata , 329, 330, 535. 

 Mathilda, 165, 502, 504. 

 Mathilda magellanica, 161. 

 Megathyris, 472. 

 Melania, 52, 462, 464, 

 Melania bulla, 460, 464. 

 Melina, 526. 

 Melina perna, 531, 

 Meló, 91, 499. 

 Meló kivhi, 84. 

 Meretrix, 296. 

 Meretrix arenophila, 302. 

 Meretrix chalcedonica, 48, 55. 

 Meretrix Iheringi, 302, 349. 

 Meretrix pseudocrassa, 349. 

 Meritopsis, 499. 

 Mesalia caribaea, 531. 

 Mesodesma, 91, 487, 499, 521, 522. 

 Mesodesma attenuata, 86. 

 Mesodesma donacium, 498, 517, 521. 

 Mesodesma mactroides, 431, 498, 522, 



537, 540, 

 Mesodesma mactroides Arechavaletai, 



522. 

 Mitra, 502,504. 

 Mitra alata, 536, 

 Mitra cliilensis, 198. 

 Mitra chiloensis, 198, 200. 

 Mitra crymochara, 197. 

 Mitra enysi, 86, 91. 

 Mitra Martyni, 198, 

 Mitra maura, 198. 

 Mitra orientalis, 198. 

 Modiola, 92. 269. 

 Modiola aff. tulipa, 359, 378. 

 Modiola Ameghinoi, 275. 

 Modiola andina, 274. 

 Modiola contorta, 467. 

 Modiola lepida, 378. 

 Modiola Martensi, 378. 

 Modiola platensis, 358, 378. 

 Modiola purpurata, 412, 

 Modiola rionegrensis, 38, 

 Modiola Eodriguezi, 270. 

 Modiola Schythei, 346, 

 Modiola tulipa, 378, 



