INDEX. 
Page. 
Actinopteria boydi, occurrence of 72, 74, 76, 77 
Actinopteria decussata, occurrence of 64 
Actinopteria perstrialis, occurrence of 77, 78 
Actinopteria theta, occurrence of 77 
Ambocoelia gregaria, occurrence of 83, 86 
Ambocoelia umbonata, occurrence of 51, 
56, 57, 59, 60, 61, 62, 63, 64, 69, 70, 
74, 75, 85, 86, 87, 88, 90, 91, 92, 95 
American Association for the Advancement 
of Science, report made before 8 
Amnigenia, occurrence of Ill 
Amnigenia catskillensis, geologic horizon 
of 48 
Animal and plant aggregates, discussion of. 13-20 
Athyris angelica, occurrence of 85, 86, 87 
Athyris angelica stage or faunule, geologic 
place of 46, 48 
Athyris polita, occurrence of 86 
Athyris spiriferoides, occurrence of 51, 
56, 57, 59, 60, 61, 62, 63, 64, 65, 75 
Atrypa globuliformis, occurrence of 98 
Atrypa hystrix, occurrence of 79 
Atrypa reticularis, occurrence of 74, 79, 95 
Atrypa reticularis stage or faunule, geologic 
place of 47 
Atrypa spinosa hystrix, occurrence of 83, 86 
Aviculopecten, occurrence of 90 
Barclay coal fauna, geologic place of 47 
Barrande's theory of "colonies," observa- 
tions on 31, 34 
Bedford shale stage or faunule, geologic 
place of 48 
Beecher, C. E., aid by 49 
Bellerophon leda, occurrence of 64 
Bellerophon msera, occurrence of 96 
Benthos, definition of 14 
Berea grit, faunule of 48 
Bibliography 135-139 
Biochron, definition of 31, 132 
Bion, definition of 127 
Bionic classification, scheme of 30 
Bioriic energy, definition of 127 
Bionic equilibrium of a fauna, definition of. 26 
Bionic quality, definition of • 128 
Bionic time-scale, terms of 132 
Bionic value of fossils, discussion of 124-134 
table showing 129 
Black shales, conditions of deposition of. . . 110 
faunas of 47, 48, 110 
st ratigraphic equivalents of 99 
Black shales fauna, geologic place of 47 
stages or faunules of 47 
Botanical classification, principles of 15-16 
C. 
Page. 
Camarotoechia. See also Rhynchonella. 
Camarotoechia alleghania, occurrence of . . 88 
Camarotoechia contracta, occurrence of 83, 
85, 86; 87, 88, 91, 94, 96 
Camarotcechia contracta saxatilis, occur- 
rence of 79 
Camarotcechia duplicata, occurrence of 86 
Camarotoechia eximia, occurrence of 74, 
76, 77, 88, 96 
Camarotoechia orbicularis, occurrence of . . 88 
Camarotoechia cf. prolifica, occurrence of. . . 90 
Camarotcechia sappho, occurrence of 88 
Camarotcechia stephani, occurrence of 74, 
76, 77, 88, 95, 96 
Canada, Hamilton formation in, fauna of. . 64-65 
Cardiola speciosa, occurrence of 69 
Cardiola speciosa fauna, correlation of 45, 
46,48,81,82 
mutation of 81, 82 
occurrence of 69, 115 
stratigraphic horizon of 45, 46, 48, 81, 82, 99 
Catskill fauna, formations containing 48 
geologic place of 45 
Catskill flora, geologic place of 47 
Catskill formation, fauna of 48 
faunal shifting coincident with depo- 
sition of 116 
geologic horizon of, local variation of. . 108 
stratigraphic place of 44, 47, 104, 120, 122 
Cayuga Lake section, fauna of 54-57, 73 
Cemetery Hill, Owego, N. Y., fossils from.. 90 
Centronella julia fauna, geologic place of. . 46 
Chemung fauna, dominant list of 96 
faunules of 48 
geologic place of 45 
mingling of, with Ithaca fauna 100 
table showing 94 
Chemung formation, fauna of 48, 
49, 50, 82-89, 95, 96 
fauna of, identity of, in part, with that 
of Hamilton formation 38 
stratigraphic place of 43, 
44,47,99,112,120,122 
thickness of 45, 93 
Chemung (Upper) zone, fossils of 88, 89 
Chenango Valley, New York, formations 
in, thickness of 93 
Chonetes coronatus, occurrence of 51, 
56, 58, 59, 60, 62, 63, 64, 65, 75 
Chonetes lepidus, occurrence of 57, 58, 64, 90 
Chonetes mucronatus, occurrence of 56 
Chonetes scitulus, occurrence of 57, 
58, 62, 63, 64, 74, 76, 85, 86, 87, 92, 95 
Chonetes setigerus, occurrence of. . 72, 76, 90, 95, 96 
Chonetes yandellanus, occurrence of 67 
141 
