SCIENTIFIC INDEX. 
PART II. PAGES 475 TO 1081. 
The most important reference is given first; others followin numerical order. Fach scientific name 
is indexed for every page on which it occurs. Synonyms, and also the figures referring to the pages on 
which they are mentioned, are in italics. An asterisk after a page reference signifies that an illustration 
of the form in question is given on that page. A page reference in bold face type signifies that on this 
page the form is described. 
Acidaspide, 744. 
Acidaspis parvula, 744. 
spiniger, 723. 
Aclisina, 1022. 
Acmea, 819, 820. 
Acmeide, 837. 
Actinoceras, 781, 763, 766. 
beloitense, 782, 812. 
bigsbyi, 781, 812. 
remotiseptum, 782, 812. 
Actinoceratide, 781. 
Actinodonta, 608. 
Actinomya, 628, 485, 501, 504-506, 513, 515, 517, 
518, 524, 525, 531. 
cincinnatiensis, 514.* 
modioliformis, 515, 516. 
pholadiformis, 514.* 
saffordi, 515. 
subcarinata, 516, 514. 
superba, 505. 
Actinopteria, 485. 
‘®chmina, 632, 664, 666, 678. 
Aglaia, 632, 631. 
Agnesia, 960. 1 
Allodesma, 617, 486, 504, 628. 
subellipticum, 617. 
Allonychia, 498, 485. 
Allorisma, 619, 487, 517. 
Ambonychia, 489, 483, 485, 490, 491, 493, 494, 498, 
534, 557. 
acutirostra, 494, 
affinis, 492, 490. 491. 
amygdalina, 493, 490, 494, 
aphea, 494. 
attenuata, £94, 495. 
bellistriata, 492, 479*, 490-493, 498, 499, 
erecta, £96. 
intermedia, 499. 
jamesi, 498. 
lamellosa 494, 493, £95. 
nitida, 494. 
orbicularis, 490-493. 
planistriata, 491, 490, 492, 495. 
radiata, 498, 477*, 490. 
retrorsa, 499. 
robusta, 499. 
superba, 494. 
undata, £97. 
Ambonychiide, 489, 476, 485, 501, 532, 534, 537. 
American species of Ceraurus, note on classifica- 
tion of, 736; ditto, of Lichas, 751. 
Ammonoidea, 761, 762. 
Amnigenia, 486. 
Amphicoelia, 491, 485, 489, 490. 
Amphion, 743. 
Angellum, 534. 
Angle, genal, 697. 
Annulations, 698. 
Anodontopsis, 487. 
Anomalodonta, 498, 486. 
Anoptera, 485. 
Anthracomya, 485. 
Anthracoptera, 485. 
Anthracosia, 486. 
Aparchites, 6483, 632, 633, 640, 642, 647, 650, 683. 
arrectus, 646. 
chatfieldensis, 646. 
ellipticus, 644, 637, 645. 
fimbriatus, 645. 
granilabiatus, 644, 645, 646. 
inornatus, 647. 
leperditoides, 648. 
maccoyii, 644. 
millepunctatus, 645, 646. 
minutissimus, 648, 646. 
var. trentonensis, 646, 686. 
oblongus, 640. 
obsoletus, 640. 
simplex, 644. 
subovatus, 648. 
tyrrellii, 647. 
unicornis, 649, 647. 
whiteavesii, 643. 
Aperture of Gastropoda, 815. 
Apical angle of Gastropoda, 817. 
Arca, 5338, 584. 
Arcide, 533, 486, 583, 584. 
Archinacella, 828, 815, 820, 821, 822, 825-827, 832, 
836, 837. 
canadensis, 828. 
cingulata, $29, 830, 833. 
deleta, $31, 833, 834. 
