482 <A. E. Verrili—Radiata from the Coast of N. Carolina. 
Some of the most salient topographical features of the U 
Menomonee had been sculptured to the depth of two hannah 
feet or more before that time, and were afterward buried and 
wholly obliterated by the Lower Silurian deposits, and have been 
partially restored by the subsequent erosion to which that valley 
now owes its features). We now find ridges, consisting of the 
nearly vertical beds of Huronian quartzite and iron ores, ca 
with the horizontal sandstone, of which last patches still remainin 
sey on the end and side declivities. Where the sandstone was 
eposited at the base of these cliffs, we find it consisting largely 
of a breccia of the debris of quartzite and iron ore, identical in 
character with these substances in the unbroken ledge It 
would probably be perfectly safe to apply the same remark to the 
Cupriferous series. . Its members were formed, as we have seen 
in the previous pages, before the elevation of the Huroniam 
rocks. The deposition of the Silurian rocks bordering on Lake 
sandstone over an area, which after having undergone an enor — 
for instance, by supposing them to have thinned out, when ata 
distance of 18 miles they have a thickness measured by m 
a thickness they exhibit wherever they are known, at pomls 
hundreds of miles apart on the north and south shores. 
=——— 
Art. LVII.— Brief Contributions to Zoology frem the Museum of 
Yale College. No. XXIL— On Radiata from the Coast of North — 
Carolina; by A. E. VERRILL. 
Potyrs; ALCYONARIA. 
Corallum somewhat flabelliform, branching nearly in om 
eon but the branches are not normally coalescent. a 
are irregularly pinnate and sometimes partially he 
the branchlets are alternate and diverge at a wide ang 
times nearly at right angles, and are usually from ‘2 
one i 
