266 NOTES. 
NOTE D, PaGe 72. 
See “F oot-Prints of the Creator,” pages 75-80, where the struc- 
ture of the head of the Osteolepis is fully described and figured. 
NOTE E, Pace 93. 
In “The Testimony of the Rocks” the flora of the Old Red is 
treated at great length. See pages 433-462. See also, on the 
same subject, ‘ Foot-Prints of the Creator,” pages 209-222. 
NOTE E, (No. 2) PAGE 126. 
The genus Cephalaspis (Agas.) has been confounded with the 
Pteraspis (Kner.). Cephalaspis rostratus is a Pteraspis ; and Professor 
Huxley and Mr. Salter describe Cephalaspis Lewisii and Lloydii as 
Pteraspides. Sir P. de Grey Egerton has determined two new 
species of Cephalaspis (C. Salweyt and C. Murchisoni). — Proce. 
Geol. Soc., August, 1857. 
NOTE F, Paq@es 128 anv 143. 
Sixteen years ago, when “The Old Red Sandstone” was writ- 
ten, the Cephalaspis was little understood. Since then, however, 
a few specimens have been found in the neighborhood of Ar- 
broath, which demonstrate that the animal was provided with a 
large and powerful tail, and with equally powerful pectorals, so 
that its impetus need not have been, as here stated, “ compara- 
tively slow.” It is now also well ascertained that the peculiar 
“cutting-knife ” or “ bolt”-like shape of the head, so generally 
noticeable in the earlier specimens, was the result of accident. 
A single cephalic shield of bone, thickly covered with discoidal 
bony plates of beautiful workmanship, was bent round the whole 
of the upper portion of the creature’s head, including the sides, 
somewhat after the fashion of a lady’s bonnet shade; with this 
difference, that, instead of the pointed ends, or “ horns,” being 
fastened, as in the case of the bonnet, they projected freely back- 
