Art. II.] Bownocker, Comife7'otts Rocks of Ohio 39 
It appears therefore, that the difference between the faunas 
above and below the bone-bed in the central Ohio area is not 
great, that this difference is most conspicuous at Delaware and 
diminishes to the north, being least at Sandusky. 
ON THE CLASSIFICATION OF A FEW SPECIES. 
Stylastrea anna. Forms referred to this species have been 
frequently found at nearly all localities from Columbus to Kel- 
ley’s Island, also at White House. Various phases of preserva- 
tion were to be seen. The specimens all agree in not having 
the septa run to the center. 
Blocks containing a hundred polyps failed to show one in 
which the septa violated the rule just given. Moreover the 
septa are plainly denticulate. Tabula prominent. The forms in 
question agree very closely with Whitfield’s description.^ 
This species is easily distinguished from Acervularia and 
Cyatkophylhim by the septa which in these two genera reach the 
center. 
Conocardium ciineus. This name has been adopted by the 
writer for what has commonly been known among Ohio Paleon- 
tologists as C. trigojtale. Hall names the form in question C. 
cuneiis var. trigonale^ and states that this name is given to those 
forms found in the Corniferous limestone.^ 
A large number of specimens of this prolific form have 
been collected. Their comparison with Hall’s plates of C. ciineus 
fails to show any difference on which a new species could be es- 
tablished, or even a new variety. The form of the species var- 
ies considerably, but these variations graduate into each other 
to such an extent that it does not seem advisable to divide the 
forms. 
Dalmanites aspectans. To this species are referred the forms 
known as D. helena. 77., and D. okioense. M. These names 
were applied to specimens shaped like the pygidium of D. as- 
pectans, but differing from this species in having the surface 
^ Geol. Surv. of Ohio, Vol. VII, page 420, pi. II. 
^ Pal. N. Y., Vol. V, Pt. I, Lamm. II, p, 410. 
