FRANKLIN COUNTY. | 627 
Nucleocrinus Vernewls belongs between two flint courses just under the 
bone-bed. It is very abundant in this horizon. 
Platyceras dumosum is also found abundantly in the same stratum, but 
it may not be limited to it. 
Spirifera mata has been found only in the lowest courses of the Dela- 
ware beds. The same is true of Athyris vittata, which occurs zn the bone- 
bed. 
Grammysia bi-sulcata occurs near the bottom of the Delaware beds, but 
is rarely met. 
Rhynchonella Carolina belongs very near the bone-bed—is found some- 
times, indeed, in it. , 
The only tentaculite known in the system (Tentaculites sp.?) belongs 
in the Delaware beds, and mainly in the uppermost portions. 
In the fifteen feet below the bone-bed the following forms are found. 
Those marked with a star are not known to occur elsewhere, but more 
extended observations on these points are necessary : 
Spirifera acuminata. 
Spirifera manni.” 
Spirifera duodenaria.* 
Spirifera gregaria. 
- Strophomena rhomboidalis. 
Strophodonia hemispherica. 
Chonetes laticosta.” 
Atrypa reticularis. 
Nucleospira concinna.* 
Platyceras dumosum.” 
Proetus planimarginatus. 
Dalmania Ohioensis. 
Phacops bufo. 
Nucleocrinus Verneuili.* 
Cystiphyllum Americanum.* 
Favosites. 
Cyathophyllum Zenkeri ? 
Eridophyllum Verneuilanum.* 
Fenestella. 
Allusion has already been made to the peculiar interest with which 
the remains of ancient fishes, contained in the Corniferous limestone, 
must be viewed. They mark the presence of a higher type of animal 
life in this formation than any of the strata below it contain. They 
constitute the lowest and oldest remains of vertebrates that we meet in 
ascending the geological scale of the continent. The vertebrate type 
appears here as well as elsewhere in its lowest class, viz., Fishes. 
