8 44 



INDEX OF SPECIES. 



nitidus, a, um, 



Didymograptus, 31 



Eunema, 670 



Obolella, 189 



Trochonema, 670 



Whitfieldella, 347 

 nivea, Turbonilla, 710 

 nobilis, Uncinulus, 293 

 nodilirata, Nerita, 706 

 nodocarinatus, Euphemus, 621 

 nodocostata, Grammysia, 381 

 nodosa, um, 



Porcellia, 627 



Trachydomia, 675 



Platyceras, 684 

 nodostriata, Atrypa, 309 

 nodulatum, Actinostroma, 40 

 nodulifera, Goniobasis, 744 

 nodulosa, Beatricea, 47 

 noe, Loxonema, 693 

 nucleolatus, a, 



Uncinulus, 291 



Whitfieldella, 348 

 nuptialis, 



Aporrhais, 754 



Lispodesthes, 754 

 nycteis, Triblidium, 604 



obesus, Typhis, 786 

 oblata, Rhipidomella, 263 

 obliquata, Whitella, 415 

 obliquus, a, 



Arthrostylus, 152 



Cinulia, 808 



Ctenodonta, 394 



Homotrypa, 129 



Trigonarca, 407 

 obliterato-granosa, um, 



Cerithium, 748 



Fibula, 748 

 oblongatus, Nuculites, 398 

 oblongula, Membranipora, 169 

 oblongus, a, 



Cypricardella, 585 



Pentamerus, 275 



Pleurophorus, 533 

 obrapum, Fulgur, 769 

 obscura, Dekayella, 132 

 obsoletus, a, um, 



Acanthonema, 691 



Grammysia, 381 



Limoptera, 422 



Parallelodon, 404 



Tetranota, 613 

 occidaneus, Aviculopecten, 490 

 occidens, Phanerotrema, 638 

 occidentalis, e, 



Actinodesma, 423 



Arctica, 537 



Atrypa, 311 



Aviculopecten, 490 



Caprina, 549 



occidentalis, e, 



Conchidium, 273 



Corbicula, 544 



Fenestrapora, 145 



Haminea, 809 



Hebertella, 255 



Hypsipleura, 739 



Leptobolus, 194 



Lucina, 556 



Pholadomya, 530 



Pleurophorus, 533 



Solemya, 375 

 octobrachiatus, Dichograptus, 28 

 octolirata, Pyropsis, 767 

 oehlerti, Coelidium, 652 

 ohioensis, e, 



Anthracopupa, 821 



Ceramoporella, 122 



Conocardium, 438 



Labechia, 46 



Paracyclas, 554 



Receptaculites, 19 



Trimerella, 191 

 oklahomaensis, Aviculopecten, 492 

 olivaceus, Melampus, 814 

 oneidaense, Acrophyllum, 60 

 oniscus, Corbula, 575 

 operculiformis, e, 



Entolium, 507 



Pecten, 507 

 orbiculatus, Lyriopecten, 494 

 orbignyanus, Discotrochus, 102 

 orcutti, Coralliochama, 551 

 ordinatus, Chonostegites, 91 

 ornatissima, Margarita, 704 

 ornatus, a, um, 



Cyrtolites, 609 



Lunulicardium, 428 



Trachypora, 95 

 orthonota, um, 



Endodesma, 527 



Modiolopsis, 512 

 ostiolata, um, 



Chilotrypa, 125 



Clathrodictyon, 41 

 ostrarupis, 



Pleurotoma, 800 



Surcula, 800 

 ostrearum, Drillia, 803 

 ottawaensis, Trematis, 202 

 ovalis, Nematopora, 153 

 ovata, 



Arctica, 538 



Aucella, 458 



Grammysia, 381 



Megambonia, 411 



Meretrix, 565 



Stromatotrypa, 137 

 oviformis, 



Modiolodon, 516 



Plethomytilus, 434 



