SCIENTIFIC INDEX. 



PART II. PAGES 475 TO 1081. 



The most important reference is given first; others follow in numerical order. Each 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. 



Acidaspidae t 744. 

 Acidaspis parvula, 744. 



spiniger, 7SS. 

 Aclisina, 1022. 

 Acmaea, 819, 820. 

 Acmasidas, 837. 

 Actinoceras, 781, 763, 766. 



beloitense, 782, 812. 



bigsbyi, 781, 812. 



remotiseptum, 782, 812. 

 Actinoceratidae, 781. 

 Actinodonta, 608. 



Actinomya, 628, 485, 501, 504-506, 513, 515, 517, 

 518, 524, 525, 531. 



cincinnatiensis, 514.* 



modioliformis, 515, 516. 



pholadiformis, 514.* 



saflordi, 515. 



subcarinata, 516, 514. 



superba, 505. 

 Actinopteria, 485. 

 ^Echmina, 632, 664, 666, 678. 

 Aglaia, 632, 631. 

 Agnesia, 960. 

 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. 



acuttrostra, 494. 



afflnis, 492, 490, 491. 



araygdalina, 493, 490, 494. 



aphaea, 494. 



attenuata, 404, 495. 



bellistriata, 492, 479*, 490-493, 498, 499. 



ereeta, 496. 



intermedia, 499. 



jamesi, 498. 



lumellosa 494, 493, 495. 



nitida, 494. 



orbicularis, 490-493. 



planistriata, 491, 490, 492, 495. 



radiata, 498, 477*, 490. 



retrorsa, 499. 



robusta, 499. 



superba, 494. 



undata, 497. 



Ambonychiidaa, 489, 476, 485, 501, 532, 534, 537. 

 American species of (Jeraurus, note on classifica- 

 tion of, 736; ditto, of Lichas, 751. 

 Ammonoidea, 761, 762. 

 Amnigenia, 486. 

 Arnphicoelia, 491, 485, 48P, 490. 

 Amphion, 743. 

 Angellum, 534. 

 Angle, genal, 697. 

 Annulations, 698. 

 Anodontopsis, 487. 

 Anomalodonta, 498, 486. 

 Anoptera, 485. 

 Anthracomya, 485. 

 Anthracoptera, 485. 

 Anthracosia, 486. 

 Aparchites, 643, 632, 633, 640, 642, 647, 650, 683. 



arrectus, 646. 



chatfleldensis, 646. 



ellipticus, 644, 637, 645. 



flmbriatus, 645. 



granilabiatus, 644, 645, 646. 



inornatus, 647. 



leperditoides, 648. 



maccoyii, 644. 



millepunctatus, 645, 646. 



minutissimus, 648, 646. 



var. trentonensis, 646, 686. 



oblovyus, 640. 



obsoletus, 640. 



simplex, 644. 



subovatus, 648. 



tyrrellii, 647. 



unicornis, 64!) , 647. 



whiteavesii, 643. 

 Aperture of Gastropoda, 815. 

 Apical angle of Gastropoda, 817. 

 Area, 533, 584. 

 Arcidae, 533, 486, 583, 584. 



Archinacella, 828, 815, 820, 821, 822, 825-H27, 832, 

 836, 837. 



canadensis, 828. 



cingulata, 829, 830, 833. 



deleta, 831 , 833, 834. 



