13G 
GEOLOGICAL SKETCH OF THE ESTUARY AND FRESH WATER DEPOSIT 
Thespesius occidental is, Leidy. 
Ischyrotlierium antiquum, “ 
Compsemys victus, “ 
Emys obscurus, “ 
Gyclas formosa, Meek and Hayden. 
Cyclas frayilis, “ 
Gyclas subellipticus, “ 
Gyrena moreauensis, “ 
Gyrena intermedia, “ 
Corbula mactriformis, u 
Unio priscus, “ 
Bullin us teres, “ 
Bulimus vermicuhus, “ 
Bulimus limneaformis , u 
Bulimies nebrascensis, u 
Pupa helicoides, “ 
Limnea tenuicosta, u 
Physa longiuscula, “ 
Pliysa nebrascensis, “ 
Planorbis subumbilicatus, “ 
Planorbis convolutus, u 
Planorbis frayilis, u 
Velletia ( Ancylus ) minuta, “ 
Paludina multilineata, “ 
Paludina Leai, “ 
Paludina retusa, u 
Paludina peculiaris, u 
Paludina trocliiformis, “ 
Paludina Leidyi, “ 
Valvata parvula, “ 
Melania minutula, “ 
Melania Anthonyi, “ 
Melania multistriata , “ 
Melania nebrascensis, “ 
Melania Warrenana, “ 
VERTEBRATA. 
Proc. Acad. 
. Nat. Sci. 
, Pa . 
, yin. P . 
311. 
U 
U 
a 
89. 
u 
U 
u 
312. 
u 
u 
u 
312. 
MOLLUSC A. 
Proc. Acad. 
Nat. Sci., 
Pa., 
VIII.. p. 
115. 
U 
U 
a 
U 
u 
a 
u 
u 
a 
u 
u 
a 
116. 
u 
u 
u 
117. 
a 
u 
u 
u 
u. 
u 
u 
u 
a 
118. 
u 
u 
a 
u 
u 
a 
u 
u 
u 
u 
a 
u 
119. 
a 
a 
a 
u 
u 
a 
u 
a 
a 
120. 
u 
a 
a 
u 
u 
a 
cc 
u 
a 
120. 
u 
u 
a 
u 
u 
a 
121. 
u 
u 
a 
122. 
a 
u 
a 
a 
u 
a 
u 
u 
a 
123. 
u 
u 
a 
u 
u 
u 
u 
a 
u 
124. 
cc 
u 
u 
u 
a 
u 
u 
a 
1857, 
137. 
