explanation of plate 15, 
27 
Oxford Museum, from the Lias at Lyme Regis, containing 
within the ribs, a coprolitic mass of digested bones, inter- 
^ersed with scales of fishes, a, Furcula. b, Clavicle, c, 
oracoid bone, d. Scapula, e. Humerus. (Fisher. Ori- 
ginal.) 
Plate 15. V. I. p. 187.) 
Th * ^ ^ 
A ne specimens are all of the natural size except where 
fhe figures denote otherwise. (Original.) 
1 and 2. Intestines of the two most common English 
species of Dog-Fishes, injected with Roman cement. 
The vascular structure, which is still apparent in 
the desiccated membrane, resembles the impressions 
on the surface of many Coprolites. 
3. Coprolite from the Lias at Lyme, exhibiting the spiral 
folding of the plate of digested bone, and impressions 
of the intestinal vessels and folds upon its surface. 
(See Note, V. I. p, 194. et seq.) 
3 . Magnified scale of Pholidophorus limbatiis, embedded 
in the surface of the Coprolite, Fig. 3. This scale 
IS one of those that compose the lateral line, by which 
a tube passes to convey mucus, from the head, along 
the body of fishes ; a. is the hook, on the superior 
margin, which is received by a depression on the 
inferior margin of the scale above it, corresponding 
with b. ; c. is the serrated edge of the posterior 
margin, perforated at e. for the passage of the mu- 
cous duct ; d. is a tube on the interior surface of the 
scale to carry and protect the mucous duct. (See 
^ note V. I. p. 191 .) 
Exterior of the scale 3'. ; the same parts are repre- 
sented by the same letters ; the larger portion is 
covered with enamel ; the smaller portion next d. is 
the bony root forming the anterior margin of the 
scale. 
