30 BuiletiJi of Laho 7 'atories of Denison University [Voi. Xl. 
Lamellibranchiata. Glyptodesma erecta. Con., Grammys- 
ia bisulcata. Con., Paracyclas lirata. Con. 
Gastropoda, Callonema lichas. H., Platyceras attenua- 
tum. H. 
Pteropoda. Tentaculites scalariformis. H. 
Cephalopoda. Gomphoceras eximium. H. 
Crustacea Phacops cristata. H., Phacops rana. Green. 
This fauna is the largest found above the bone bed in this 
State. The corals seem identical with those found below. The 
brfachiopods are also quite similar, but Athyris spuifetoidcs and 
Chonctes yandellanus have not been found by the writer beneath 
the bone-bed. Among the lamellibranchs, Grammysia bisid- 
cata and among the pteropods Tentacidites scalariformis are 
forms which have not been found positively below the bone bed. 
Two species which elsewhere are common above the bone- 
bed are rare or absent here. These are L, rhomboidalis and 
S', ziczac. 
Kelley’s isf.and. 
This island is composed of Corniferous rocks. The best 
exposures are in two quarries, one on the north side of the 
island and the other on the southwest. The maximum thickness 
of the exposed section is about 36 feet. Near the surface the 
rock is shaly, but it becomes thicker below, and near the bot- 
tom of the quarry a bed 10 feet thick is found. This stone is 
softer than that to the south. It is lighter in color, also, and 
freer from siliceous impurities. 
The bone-bed has not yet been reported on the island and 
it is not yet certain that it exists there. Professor Orton thinks 
that the shales at the surface represent the Delaware or San- 
dusky horizon of the Corniferous. 
The fauna is not conclusive on this point. The writer found 
a single specimen of Tentacidites scalariformis^ but it was picked 
up in a pile of fragments and so is of undetermined location. 
Similarly Spirifera ziczac is found, but it appears to extend well 
down into the section. If this species here extends below the 
hypothetical line of junction of two great divisions of the Cor- 
niferous, why may not the former species do the same ? To 
