MOLLUSCA OF PORTO RICO, 
521 
Meretrix 485,487. 
albida 485 
aresta 485. 
circinata 485. 
cubaniana 486. 
culebrana 486 
dione 485. 
hebrsea 485. 
maculata 485. 
Merisca 479. 
Mesodesmatidre 474. 
Micromelo 
undata 364 
MScrogaza 
rotella 444. 
Mitra 396. 
barbadensis 396. 
gemmata 396. 
granulosa 396. 
hanleyi 396. 
microzonias 397. 
nodulosa 396. 
stramlnea 397. 
Mitridse 96. 
Mitromorpha 
biplicata 397. 
Mitrularia (see Cheilea). 
Modiola ( see Modiolus). 
opifex 470. 
Modiolaria 
lateralis 471. 
Modiolus 469. 
ai'boresc.ens 470 
cinnamomeus 470. 
corail iopliagus 470. 
tulipus 470. 
Modulidae 427. 
Modulus 
catenulatus 427. 
floridanus 427. 
modulus 427. 
Monodonta (see Chlorostoma). 
Murex 406. 
Murex (see Latirus, Pisania) . 
alveatus 408,409. 
antillarum 407. 
brevifrons 407. 
calcitrapa 407. 
cellulosus 408. 
intermedius 408. 
messorius 407. 
micromeris 408. 
minimus 426. 
motacilla 407. 
nodatus 407. 
nuceus 408. 
pomum 408. 
rufus 407. 
scala 390. 
scalaroides 410. 
subulatus 424. 
tulipa 397. 
Murieidae 406. 
Muricidea 409. 
floridana 409. 
hexagona 409. 
multangula 409. 
Myacea 472,473. 
Myacidae 473. 
Myrtaea 493. 
pristiphora 493. 
Mysia 486. 
tenuis 487. 
Mytilidae 469. 
Mytilus 469. 
arborescens 470. 
cinnamomeus 470. 
coralliophagus 470. 
exustus 469. 
frons 464. 
hamatus 469. 
lateralis 471. 
striatulus 469. 
Nassa 402. 
ambigua 403. 
hotessieri 403. 
unicincta 402. 
vibex 403. 
Nassaria 400. 
Nassarina 400. 
glypta 400. 
metabrunnea 401. 
Nassidae 402. 
Natica 438. 
Natica (see Polinices). 
canrena 438. 
sagraiana 438. 
sulcata 438. 
Naticidse 438. 
Naticina (see Polinices). 
Neaera (see Cuspidaria). 
Neilonella 
corpulenta 458. 
Nenia 376. 
Nerita 445. 
Nerita (see Natica). 
peloronta 445. 
praecognita 446. 
tessellata 446. 
versicolor 446. 
Neritidae 445. 
Neritina 446. 
reclivata 446. 
virginea 446. 
viridis 446. 
Neverita 
nubila 439. 
Niso 
aeglees 414. 
portoricensis 414. 
Nitidella 405. 
eribraria 406. 
laevigata 406. 
nitidula 405. 
Nodipecten 465. 
Notarchus 
pleii 367. 
Nucleobranchiata 415. 
Nucula 458. 
aegeensis 458. 
Nuculacea 458. 
Nuculidae 458. 
Nuculocardia 471. 
Nudibranchiata 368. 
Obeliscus (see Pyramidella). 
Octopoda 358. 
Octopodidae 358. 
F. C. B. 1900 34 
Octopus 358. 
americanus 358. 
granulatus 358. 
tehuelchus 358. 
tuberculatus 359. 
vulgaris 358. 
Oliva 391. 
Oliva (see Olivella). 
caribseensis 391. 
litterata 391. 
reticularis 391. 
Olivella 391. 
esther 392. 
9 
jaspidea 392. 
mutica 392. 
nivea 393. 
oryza 392. 
rotunda 392. 
verreauxi 393. 
Olividae 391. 
Omalaxis exquisita 432. 
Omphalius 443. 
Oneliidella 
floridana 371. 
nigricans 371. 
transatlanticum 371. 
Onchidiid® 371. 
Onchidium (see Onchidella). 
Oniscia (see Lambidium) . 
Opeas 374,375. 
alabastrinus 375. 
gompharium 375. 
goodallii 375. 
margaritaceus 375. 
micrus 375. 
subula 374. 
Opisthobranchiata 362. 
Orthodonta 382. 
Ostracea 463. 
Ostrea 463. 
cristata 464. 
irons 464. 
gibba 465. 
Ilians 468. 
laurentii 464. 
lima 468. 
nodosa 465. 
parasitica 464. 
rostrata 463. 
scabra 467. 
virginica 463,464. 
ziczac 464. 
Ostreidae 463. 
Ovulum (see Ultimus). 
Paludina (see Potamopyrgus). 
Papvridea 489. 
Partliena 381. 
Patella (see Acmaea). 
Patella (see Amalthea, Cheilea, Fissur 
ella). 
notata 451. 
octoradiata 450. 
Pavraudeautia 439. 
Peclen 464. 
antillarum 466. 
darwini 466. 
effluens 466. 
exasperatus 466. 
gibbus 465. 
laurenti 464. 
