42 
EXPLANATION OF PLATES 26^ 27. 
Fig. 16. Recent track of a Pea-hen. 
Fig. 17. Recent track of a domestic hen. 
Plate 26’’. 
Fig. 1. Ornithichnites giganteus. The natural cast here 
figured represents the form and size of tlie foot, and 
part of the claws. (Hitchcock.) 
Fig. 2. Ornithichnites diversus; with impressions of 
the appendage to the heel, drawn from a plaster 
mould sent by Prof. Hitchcock to the Geol. Soc. of 
London. (Original.) 
Fig. 3. Track of a small animal on Oolitic slate near 
Bath. See Journal of Royal Institution of London, 
1831, p. 538, PI. 5. (Poulctt Scrope.)* 
Plate 27. V. I.p. 269. 
Figs. 1 — 8. Tubercles and Scales, illustrating the four 
new Orders of Fishes, established by Professor 
Agassiz. (Agassiz.) 
* Mr. Poulctt Scrope has iiresented to the Geol. Soc. of Loudon 
a series of Slabs selected from the tile quarries worked iu the Forest 
Marble beds of the Oolite formation near Bradford and Bath. The 
surface of these beds is covered with small undulations or ripple mark- 
ings, such as are common on the sand of every shallow shore, and also 
with numerous tracks of small animals (apparently Crustaceans) 
which traversed the sand in various directions, whilst it w'as yet soft, 
and covered with a thin film of clay. These footmarks are in double 
lines parallel to each other, shewing two indentations, as if formed 
by small claws, and sometimes traces of a third claw. (See PI. 2fc'’, 
Fig. 3.) There is often also a third line of tracks between the other 
two, as if produced by the tail or stomach of the animal touching the 
ground. Where the animal passed over the ridges of the ripple 
markings or WTinkles on the sand, they arc flattened and brushed 
down. Thus a ridge between b. and d. (PI. 26\ Fig. 3) has been 
flattened, and there is a hollow at e. on the steep side of the ridge, 
which may have been produced by the niiimnl slipping down or 
climbing np the acclivity. 
