REMARKS ON CEPHALASPIDES. 
141 
puzzles me, as I am not aware of any sucli neutral ground, tlie one 
being always supposed to follow the other consecutively. 
Again, he mistakes in calling beds in the quarry in the drive to 
Downton Hall (at bottom of page) Tilestones- They are unques- 
tionably Old Red beds of thick sandstone, and with the same corn- 
stone as he found at the Devil's mouth, containing Cei^halaspis 
Lyellii and Pterasins rostratus. 
I will take this opportunity of noticing that my friend Marston 
has made little mistake in his list of fossils from the Old Red near 
Ludlow. I will venture to assert that no Cejjhalasjjis Saliveyi has 
ever been found in Oakley Park quarry, which lies in the lower beds 
of the Old Red, probably but little above the Passage beds. It does 
contain a Cephaspid, but as yet it is unnamed, and the original speci- 
men of C. Saliveyi came from beds very much higher up, at Acton 
Beauchamp, near Bromyard. — I remain, dear Sir, yours obediently, 
ROBEET LiGHTBODY, Ludlow. 
CEPHALASPIS FROM OLD RED SANDSTONE NEAR 
LUDLOW. 
"We think it a very necessary appendix to the above correspondence 
on Mr. Roberts' article to give an outline figure of a very nearly 
perfect Cephalaspis Lyellii, found in the Old Red Sandstone strata 
near Ludlow, by Mr. A. Marston, who kindly transmitted it to us in 
October last, with another large and more beautifully preserved head. 
Cephalaspis from Old Red near Ludlow. 
These specimens we have just forwarded to Mr. Salter, so we may 
hope for a full and efficient notice of them in the forthcoming mono- 
graph of the Government paleontologists on these ancient fishes. — 
Ed. Geol. 
