INDEX. 
145 
Page. 
Palseoneilo, occurrence of 90 
Palseoneilo brevis, occurrence of 96 
Palseoneilo brevis quadrangularis, occur- 
rence of 96 
Palseoneilo constricta, occurrence of 51, 
56, 58, 59, 60, 62, 63, 65, 71, 74, 75, 86, 92, 95, 96 
Palseoneilo emarginata, occurrence of 72 
Palseoneilo filosa, occurrence of 72, 74, 95 
Palseoneilo plana, occurrence of 95 
Panama conglomerate; stratigraphic equiv- 
alent of 122 
Papers and books consulted, list of 135-139 
Paracyelas lirata, occurrence of . . . 62, 63, 72, 76, 77 
Paracyclas lirata stage or faunule, geologic 
place of 47 
Period, definition of 31, 132 
Phacops bufo. See Phacops rana, 
Phacops rana, occurrence of 51, 56, 57, 59, 
60, 61, 62, 63, 64, 65, 67, 68, 71, 75, 82, 89, 90 
Plankton, definition of 14 
Plant and animal aggregates, discussion of. 13-20 
Pleurotomaria itys, occurrence of 96 
Pleurotomaria capillaria, occurrence of 70, 74 
Pocono formation, equivalents of 122 
Portage fauna, faunules of 48 
geologic place of 47 
Portage (Ithaca) fauna, mingling of, with 
Portage (Naples) fauna 103 
Portage formation or group, correlation of. 100, 
103, 104, 109, 112 
Eastern extension of, fauna of 71-73 
faunas of 45, 48, 99 
features of sediments forming. 110 
stratigraphic equivalents of 47, 
99, 100, 104, 109, 111-112, 122 
thickness of 45 
Powell, J. W., aid rendered by 8 
cited on importance of geologic correla- 
tion 10 
Primitiopsis punctilifera, occurrence of. 57, 58, 64 
Productella costatula, occurrence of 87 
Productella (dissimilis) hallana, occur- 
rence of 7s, 79 
Productella hirsuta, occurrence of 87, 88 
Productella hystricula, occurrence of 86 
Productella lachrymosa, occurrence of 70, 
83,85,86,88,91,94,96 
Productella speciosa, evolutionary prede- 
cessor of 78 
Productella speciosa, occurrence of 74,88,90 
Productella speciosa fauna, epoch of 133 
geologic place and equivalent of 50, 98 
mutation and correlation of 81-82 
occurrence of 70, 115 
tables showing 74, 75, 76, 77 
Productella spinulicosta, evolutionary suc- 
cessor of 78 
occurrence of 57, 58, 64 
Prosser, C. S., aid by 9, 49, 67 
cited on Chemung formation, limits of. 93 
cited on Chemung fossils 94-95 
cited on fauna of eastern New York 75 
cited on fauna of Unadilla region 62 
cited on fossils from Port Crane, N. Y.. 94 
cited on Hamilton fauna 51, 80 
Bull. 210—08 10 
Page. 
Prosser, C. S., cited on post-Oneonta fauna 
of eastern New York 93-94 
work done by 8 
Proetus canaliculars, occurrence of 67 
Prothyris lanceolata, occurrence of 72, 77 
Pterinea, occurrence of 90 
Pterinea chemungensis, occurrence of 83, 86 
Pterinopecten, occurrence of 91 
Pterinopecten crenicostatus, occurrence of. 91 
Pterinopecten suborbicularis, occurrence 
of 77 
Pugnax pugnus, occurrence of 78, 7'.), 88, 96 
Race, discussion of term 127-130 
Range, geological, of faunas, observations 
on 16-20 
Red sandstones, fossils contained in Ill 
sediments forming, features of 110-112 
Renevier, E., cited 28-29 
Reticularia. See Spirifer. 
Rhipidomella. See also Orthis. 
Rhipidomella vanuxemi, occurrence of 57, 
58,64,91 
Rynchonella. See also Camarotcechia. 
Rhynchonella allegania, geologic place of. 46 
Rhynchonella contracta, occurrence of 85 
Rhynchonella contracta stage or faunule, 
geologic place of 48 
Rhynchonella (Hypothyris) cuboides ( = R. 
venusta) , occurrence of 69 
Rhynchonella eximia, occurrence of 85 
Rhynchonella pugnus. See Pugnax pugnus. 
Rhynchonella sappho, occurrence of 85 
Rhynchonella stephani, occurrence of 72 
Rhynchonella venustula, occurrence of . . . 78 
Roemerella grandis, occurrence of 67 
Rominger, C, cited on fauna of Hamilton 
formation in Michigan 65 
Romney formation, Maryland, fauna of ... 67 
Russell, T. C, work in geologic correlation 
done by 10 
S. 
Sandstones, variability of fossils of 33 
Sayles, Ira, work done by 8 
Schizodus chemungensis, occurrence of 96 
Schizodus chemungensis quadrangularis, 
occurrence of 96 
Schizodus ellipticus, occurrence of 77 
Schizodus gregarius, occurrence of 96 
Schizophoria (= Orthis) , common features of 
many species of 85 
Schizophoria carinata, occurrence of 83 
Schizophoria cf . concentrica, occurrence of. 91 
Schizophoria iowensis, occurrence of 79 
Schizophoria striatula (= Orthis impressa), 
occurrence of 85, 86, 87, 95 
Schizophoria striatula impressa, occurrence 
of 85 
Schizophoria striatula, variation of 78 
Schizophoria tioga (= Orthis tioga), occur- 
rence of 83, 86 
