POTER. 



738 



Fosidonia P (Estheria ? ) H. D. Rogers' Geology of Penn- 

 VIII c^^^ sylvania, 1858, page 827, fig. 664. Hamilton for- 

 mation. This is possibly Clarke's Estheria pulex^ 

 Amer. Jour. Sci. [3] Vol. 23, 1882. Hamilton. 

 VIII c. 



Posidonomya (now Ambonichya) lelUstriata, Owen^ 



1852, Geol. Wis. etc., p. 2, fig. 

 He. ..atfiiifPlP"ffl|i|«iii«ii . 195 a cast from the shell beds 



of strata F. 3. A. at Prairie du 

 Ohien. Hall, Pal. N. Y., Vol. 1, 

 1847. Trenton, H. Riv. and 

 Mid. Silurian. — 77 0, 7/7 J, and 



Ow. A.b. 



.^"Z 



Posidonomya fracta, Meek, Pal. Ohio, Vol. 2, 1875, page 



;a 333, plate 19, fig. 7a, right valve; l^ 



\ left valve (perhaps of another species ?) 



presenting exactly all the external 



.v^ wr^fi characters of an oblique Inoceramus^ 



^^^' ^"^^^0}' ^S- ^(^-i being an exact miniature of tJie 

 'j-^:^^^\iio iC^^^^' ^^ji ^^^^^ Cretaceous shell I pro 



ilematicusj and therefore a great curiosity. Until the hinge is 

 discovered nothing certain can be known of it. Found in the 

 dark shales of Flint Ridge coal measures in Ohio. Meek 

 thought he had seen imperfect specimens in the Illinois coal 

 XIII 



measures. 



Poteriocrinites (Dendrocrinus) caduceus, Hall. Pamph. 



WW. 



lb 





Pal. W 



Ohto.ljll' 



Cincinnati 

 g g roup . — 

 m. Pal. Ohio, 

 § Vol . 1, 

 ^ 1873, page 

 26, plate 3 

 Jis, fig. la, 

 p age 403, 

 diagram 

 natural 

 size^ side 



