INDEX 
TO SPECIES DESCRIBED OR NOTICED IN THIS VOLUME. 
[ The heavy-faced figures indicate a description of the species. ] 
Actinodesma cruciforme, (Conrad) Hall 
A. erectum,, (Conrad) Hall, . 
Actinopteria, Ball, . 
aurieulata, Ball, . 
Boydi, ( Conrad) Ball, 95 
decnssata, Ball, . 
delta, Ball, 
Doris, Ball, 
epsilon, Ball, . 
eta, Ball, . 
eximia, Ball, . 
iota, Ball, . 
Kappa, Ball, . 
Leander, Hall, 
muricata, Ball, 
perobliqua, ( Conrad ) Ball, 
perstrialis, Ball, 
pusilla, Ball, 
subdecussata, Ball, . 
tenuistriata, Ball, . 
theta, Ball, 
zeta, Ball, . 
Allocardium alternatum, Ball, 
Ambonychia, Ball, 
Anomia, D., . 
Athyris, McCoy, . 
Avicula, Klein, . 
angustirostra, Conrad, 
bella, Conrad, . 
Boydii, Conrad, 
caneellata, Phillips, . 
Chemungensis, Conrad, 
Chemungensis, Vanuxe: 
c ruciformis, Conrad, 
decussata, Hall, 
erecta, Conrad, 
114, 117,118,160, 168 
111,118, 160 
. 131, T23 
118 , 1 
, 121 
117 
110 , 113, 114 
119, 130 
. 125 , 127 
133 , 125 
expl. PI. 
252 
54 
113, 114, 115, 116 
Avicula flabella, Conrad, 
A. lavis, Hall, . 
A. longispina, Hall, 
A. muricata, Hall, 
A. orbiculata, Hall, 
A. parilis, Conrad, 
A. pecteni/ormis, Conrad, 
A. perobliqua, Conrad, 
A. pleuroptera, Conrad, . 
A. protexta, Conrad, . 
A. quadrula, Conrad, 
A. reticulata, Bisinger, 
A. ? signata, Hall, . 
A. spinigera, Conrad, 
A. tricostata, Vanuxem, . 
A. tuberculata, Conrad, 
Avicueopecten, McCoy, 
A aequilateralis, Ball, 
A. altus, Hall, 
A. altus, White, 
A. bellus, ( Conrad ) Hall, 
A. cancellatus, Ball, . 
A. cancellatulus, McCoy, 
A. Caroli, ( Winchell) Ball, . 
A. celsus, Ball, 
A. Cleon, Ball, 
A. convexus, Ball, 
A. Coxanus, Meek cf Worthen, 
A. dolabriformis, Ball, . 
A. duplicatus, Ball, . 
A. ellipticus, Ball, 
A. exacutus, Ball, 
A. fasciculatus, Ball, 
A. formio, Ball, 
A. Balleanus, D’Orbigny, 
A. Idas, Ball, . 
5, 6, 8,10 
11 , 14, 22 
9,11, 12,14 
