SCIENTIFIC INDEX. 
drrosus, 847, 860. 
carinatus, 862, 846, 861-865, 867. 
compressus, 859. 
conradi, 862, 863. 
costatus, 1044. 
cristatus, 914, 859. 
delanonei, 852, 859. 
desideratus, 859. 
dilatus, 865, 846. 
discus, 852, 859. 
disjunctus, S64, 846. 
dyeri, 909, 859, 911. 
elegans, 911, 859, 909. 
euryomphalus, 860. 
expansus, 859. 
filosus, 859. 
gillanus, 859. 
imbricatus, 911, 859. 
lamellifer, 8£7, 860. 
magnus, 859. 
nitidulus, 866, 847. 
‘ nitidus, 859. 
obliquus, 847, 860. 
orbiculus, 852, 859. 
ornatus, SG6O, 846, 858-866, 886, 925. 
var. minor, S61, 846. 
pannosus, 859. 
parvus, 864, 846, 867. 
phasetra, 847, 860. 
retrorsus, 861, 846, 862, 864, 865, 867. 
var. fillmorensis, S62, 846. 
sinuatus, 859. 
sinuosus, 859. 
subcarinatus, 859. 
subplana, 1081, 846. 
trentonensis, 859. 
Cyrtolitide, S46, 848, 866. 
Cyrtolitina, 865, 846, $47, 858-860, 883, 886, 905. 
nitidula, 866, 864, 867. 
Cyrtometopus, 735, 736, 738. 
apollo, 737, 738. 
mercurius, 737, 738. 
prolificus, 737. 
rarus, 737, 738. 
scofieldi, 735*, 737, 738. 
Cyrtospira, 1073, 1069, 1070, 1074. 
abbreviata, 1074. 
bicurvata, LU7 4. 
brevis, 1074. 
parvula, 1074. 
tortilis, LO74, 1073. 
ventricosa, 1074. 
wykoffensis, L074. 
Cythere, 632, 631, 633, 684. 
Cythereis, 631. 
Cytherella, 684, 630-632, 643, 685, 686. 
ovata, 684 
rugosa, 686. 
var. arcta, 686. 
subrotunda, 685, 643. 
Cytherellide, 684, 632. 
Cytherellina, 632, 685, 687, 688. 
siliqua, 687-689. 
var. grandis, 687. 
ovata, 689, 687. 
tersa, 687. 
Cytheride, 632, 630. 
Cytherideis, 631. 
Cytherina, 633. 
fabulites, 634. 
Cytherodon, 486. 
Cytheropsis rugosa, 686. 
Dalmanites, 726, 732, 733. 
achates, 726, 727*, 728, 732, 733. 
anchiops, 732. 
bebryx, 732, 733. 
bicornis, 733. 
breviceps, 732, 734. 
carleyi, 732, 733. 
dentatus, 733. 
doiphi, 733. 
intermedius, 727. 
limulurus, 733. 
nasutus, 733. 
tridens, 733. 
Darwinula, 632. 
Darwinulide, 632. 
Delphinula, 939. 
Dentalium, 818. 
Depranella, 670. 
Dexiobia, 486. 
Dibranchiata, 761. 
Dicranella, G64, 632, 665, 678. 
bicornis, 665, 664. 
marginata, 666, 664. 
simplex, 666, 664. 
spinosa, 665, 664. 
Dicranactis, 726. 
Dilobella, 672, 632. 
typa, 673, 672. 
Diploceras, 775. 
vanuxemi, 775. 
Discohe ix, 1026. 
Distortion of shells by pressure, 481. 
Docoglossa, $18, 819, 845, 927. 
Dolabra, 565. 
stirlingensis, 567. 
Dorsal furrows, 697. 
Doublure, 698. 
CXXx1X 
Doubtful species of Pleurotomaria and Murchi- 
sonia, 959. 
Drepanella, 670, 632, 657, 671. 
ampla, 671. 
var. elongata, 671, 670*. 
bigeneris, 672, 670, 671. 
bilateralis. 671. 
crassinoda, 670%, 671. 
macra, 670*. 
Dyeria, 1044. 
costata, 1044*, 1045. 
Eccoptochile, 737, 738. 
clavigera, 737. 
icarus, 738. 
Ecculiomphalus undulatus, 1036. 
