GEOLOGY OF THE FOURTH DISTRICT. 



ORGANIC REMAINS OF THE OLD REDSANDSTONE. 



No. 70. — No. 130, page 281. 

 Fig. 1. Scale of Sauripteris Taylori, H. 

 Fig. 2. Scale of Holoptychus nobilissimus, Agass. (Silurian Researches, plate 2 bis. figs. 1, 



2, 3, 4, 8 and 9). 

 Fig. 3. A smaller scale of Holoptychus 1 

 Fig. 4. A fragment of a tooth watcrworn before being imbedded. 



No. 71. —No. 131, page 282. 

 Jaw-bone and teeth of Holoptychus. 



For further illustration of the fossils of the Old red sandstone, see plate 3 of this report. 



No. 72. — Page 186. 

 Cypricardia ? angustata. Report of Third District. 



ORGANIC REMAINS OF THE CONGLOMERATE. 



No. 73. — No. 139, page 291. 

 Fig. 1. Euomphalus depressus, H. (Reference E. serpens, Phil. Pal. Fossils, pi. 36, fig. 



172.) 

 Figs. 2 and 3. Cypricardia rsho?nbea, H. 

 Fifc. 4. Cypricardia contracta, H. 



These fossils are all from a single locality in Chautauque county, and the only place where 

 I have seen fossils in the conglomerate. 



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