I NDEX 



Page numbers referring to descriptions of fossils are printed in black 

 face type. The superior figures tell the exact place on the page in ninths; 

 e. g.623^ means page 623, beginning in the third ninth of the page, i. e- 

 about one third of the way down. 



Actinopteria, 655^. 



Additions to paleontologic collec- 

 tions, 46r-68«. 



Adirondaclis, maximum of com- 

 pression east of, 643°. 



Aeglina, 640*, 641-. 



Agelacrinites butt si, 527^ 528^ 



Agnostus, 640*, 641% 



Agoniatites expansus, 668*, 668^ 



Agoniatites limestone, 436^; fauna, 

 668^ 



Albion quadrangle, contact lines of 

 Upper Siluric, 519'-2r. 



Ambocoelia umbonata, 623', 624*. 

 var. gregaria, 622\ 



American association for the ad- 

 vancement of science, memorial 

 tablet for the Emmons house, 

 4522-56^ 



American paleozoic fossils, record 

 of localities, 468«-516. 



Ami, cited, 558^ 559-, 567% 576^ 576*, 

 579^ 643^ 



Amnigenia catskillensis, 671*. 



Ampyx, 640*, 641^ 



Annelids, 544^ 



Appalachian geology, 633^-63®. 



Appalachian Mediterranean, 649*. 



Appalachian valley barrier, 638^ 

 661-. 



Appalachian valley trough, 638% 



Arey, Albert L., cited, 432^ 



Arthracantha depressa, 624^ 



Association of American geologists, 

 organization, 452^ 



Athens trough, 644'. 



Athyris angelica, 526°, 527^ 

 cora. 526% 527\ 

 polita, 527^ 



Atrypa, 623^ 



aspera, 628^ 



hystrix, 624% 



reticularis, 622^. 

 Aviculopecten, 526% 

 Axonophora, 571% 



Bactrites, 655''. 



Barrois, cited, 563% 



Bays sandstone, 645% 



Beekmantown dolomite, exposures,. 

 534% 536*, 537% 537% 



Beekmantown formation, 637*; 

 study of fauna, 427*; in Rensse- 

 laer county, graptolite (Levis) 

 facies, by Rudolf Ruedemann, 

 546-75. 



Beekmantown time, 660% 



Bell, Robert, mentioned, 434% 



Bellerophon ma era, 526% 



Beloceras, 656% 



Bortrand, cited, 649% 



Billings, E., referred to, 633% 



Black river invasion, 641% 



Bothriolepis, 528% 528% 



Brachiopods, 430% 527% 533% 539% 

 544% 554% 556% 566*. 



Brockport quadrangle, contact lines 

 of upper Siluric formations, 517^- 

 23. 



Brogger, cited, 563% 



Bronn, cited, 599^. 



Bryograptus, 550% 555^ 584% 586% 

 588% 589% 

 sp. nov. 554*, 555', 556% 

 kjerulfi, 556% 



Buthotrephis gracilis, 597% 

 subnodosa, 597% 



Butts, Charles, referred to, 441% 

 442"; paleontologic work, 446% 

 524% 



