INDEX. 
Leptodesma umbonatum, Sail, 
Iumbonatum vai\ depressum, Sail, 199, 
Lima gldber, Hall, .... 
macroptera, Conrad, 
obsoleta, Hall, . 
rugcestriata, Hall, . 
Thmoptera, Sail, 
cancellata, Sail, . 
cancellata var. occidens, H. &. W., 
curvata, Sail, 
macroptera, ( Conrad ) Sail, 
obsoleta, Sail, 
pauperata, Sail, 
Lyuiofecten, Sail, 
anomiaeformis, Sail, . 
cymbalon, Sail, 
Dardanus, Sail, 
fasciatus, Sail, 
interradiatus, Sail, 
macrodontus, Sail, 43, 45 , 46 
magnificus, Sail, . 45, 
orbiculatus, Sail, . 
parallelodontus, Sail, 
Polydorus, Sail, . 
Priamus, Sail, . 
solox, Sail, . 
tricostatus, ( Vanuxem) Sail, 
Meristina, Sail, .... 
Modiola, Lamarck, 
M. metella, Hall, 
M. prcecedens, Hall, 
M. (Mytilops) metella, Sail, 
M. M. ) praecedens, Sail, 
Modiomorpha, Sail, 
Monotisprinceps, Conrad, 
Mytilarca, Sail, .... 
arenacea, Hall, 
attenuata, Sail, 
carinata, Sail, 
Chemungensis, (Conr.) S., 257, 258, 25£ 
fibristriata, (White <f Whitfield) Sail, 
gibbosa, Sail, ... 
lata, Sail, .... 
occidental^, (White <f Whitfield) Sail 
oviformis, (Conrad) Hall, . 
ponderosa, Hall, . 
pyramidata, Sail, 
radiata, Hall, 
regularis, Sail, 
simplex, Sail, 
triqueter, (Conrad) Hall, 
umbonata, Sail, . 
(Plethomytilus) arenacea. Sail, . 
) cordiformis, Hall, 
) Knappi, Sail, 
) mytilimera, Conrad, 
) ovata, Sail, 
) oviformis, Sail, 
) ponderosa, Sail, . 
a ) lata, Hall, . 
) metella, Hall, . 
) prcecedens, Hall, . 
) simplex, Hall, . 
50, 52, 55 
18, 50, 51 
41, 42 
Mytilus, ..... 
M. Chemungensis, (Conrad) Phillips 
M. fibristriatus, White & Whitfield, 
M. occidentcilis. White & Whitfield, 
M. Whitfieldianus, Winchell, . 
PaetEOPinna, Sail, 
P. flabella, Sail, . 
P. recurva, Sail, 
Pecten cancellatus, Hall, 
P. ? convexus, Hall, 
P. ? crenulalus, Hall, 
P. ? dolabriformis, Hall, 
P. duplicdtus, Hall, 
P. Salleanus, D’Orbigny 
P. striatus, Hall, . 
P. Tranquebaricus, Gme 
P. undulatus, McCoy, 
Pernopecten, Winchell, . 
P. fasciculatus, Hall, 
Plethomytilus, Sail, 
P. ponderosus, Hall, 
Pterinea, Goldfuss, 
P. avis, Hall, 
P. Boydi, Conrad, 
P. Chemungensis, (Conr 
P. consimilis, Sail, 
P. costulata, Roemer, 
P. dispanda, Sail, 
P. fasciculata, Goldfuss, 
P. flabella, Sail, . 
P. grandis, Sail, 
P. interstrialis, Sail, 
P. longispina, (Hall) S. A 
P. pinguis, Sail, 
P. prora, Sail,. 
P. protexta, (Conrad) 3. A. Millei 
P. reprobus, Hall, 
P. reversa, Hall, 
P. reversa var. avis, Hal 
P. rigida, Sail, 
P. ? suborbicularis\ Hall 
P. triqueter, Conrad, 
P. (Vertumnia) avis, Sal 
P. (V. ) reproba, 
P. (V. ) reversa, Sail, 
Pteronites, McCoy, 
P. inoptatus, Sail, 
P. lasvis, (Hall) S. A. Mil 
P. muricatus, Hall, . 
P. profundus, Sail, 
P. rostratus, Sail, 
P. spinigerus, (Conrad; 
P. subdecussata, Hall, 
Pterinopecten, Sail, 
P. conspectus, Sail, . 
P. crenicostatus, Sail, 
P. crenulatus, Hall, . 
P. dignatus, Sail, 
P. dispandus, Sail, . 
P erectus, Sail, . 
P. exfoliatus, Sail, 
P. filitextus, Sail, 
P. Hermes, Sail, 
P. imbecilis, Sail, 
d) Sail, 
Miller, 
Sail, 
.. Miller, 
59, 60 
67, 
63, 64, 66, 67, 
