62 Review of the New York Geological Reports. 
On the Mississippi, a little below the mouth of Rock River, in 
limestone, probably an extension of the lowa City rock, a coral 
abounds resembling Fig. 3, but the cylinders of which the group 
is composed are of larger size. We have been disposed to con- 
sider it Cyathophyllum cespitosum, inasmuch as it shows no ap- 
pearance of a syphon nor transverse connecting tubes. 
Along with these are found Cyathophyllum flecuosum, and 
C. ceratites ; hence Eaton’s name for this limestone, “ ceratial 
rock.” 
Corals are far more numerous than shells in the Onondaga lime- 
stone ; in Vanuxem’s report, however, the following Testacea are 
figured, which we are informed are generally diffused in, and ap- 
pear to be confined to this rock in the third district. 'They do 
not appear, however, to have a wide range beyond this region of 
the state. 
Vanuxem’s Report, p. 137. 
Fig. 1. Pentamerus elongata. 2. Hipparionyx (Atrypa 2) consimilaris. 3. Del- 
thyris undulatus. 
