E24. ON SOME AMPHIBIAN AND REPTILIAN REMAINS 
extend back nearly to the posterior extremity of the ramus. The 
precise boundaries of the third distinguishable component of the 
mandible, the articular bone, are not to be made out; but on the 
left side, the matrix which fills the posterior end of the ramus 
extends forwards, becoming narrower until it ends by a slender 
rounded extremity, coated with a bony sheath, between the angular 
and the dentary, and near the anterior termination of the latter. 
On the right side, in the counterpart, the section of this style-like 
process of the matrix is seen, and seems to be connected with a 
narrow bony plate, which appears on the inner side of the ramus 
between the dentary and the angular. 
The posterior end of the articular element is broad and somewhat 
produced internally, so as to afford sufficient space for the adjustment 
of the wide articular end of the suspensorial peduncle. 
On the under surface of the skull (fig. 3), a whitish patch may be 
observed on the inner side of the anterior part of the right ramus of 
the mandible, and a much larger transverse band, of a similar aspect, 
stretches from the posterior part of the left ramus, two-thirds of the 
way across to the opposite one. 
When these patches are minutely examined, they are seen to 
consist of a multitude of small, flat, polygonal scutes, of very various 
dimensions and forms, but none exceeding jth of an inch in 
diameter. These minute scutes are fitted together by their edges ; 
and their surfaces are marked by irregular grooves and pits, which 
are so disposed as to leave a narrow, clear margin (fig. 7). 
Between the posterior extremities of the rami, the same surface of 
the fossil exhibits on each side the indistinct impression, and part of 
the bony substance, of a broad, flat, triangular plate, whose base is 
turned inwards, and whose apex is produced and bent upwards. 
Two other fragmentary bones, of apparently a similar character, lie 
behind these; and still further back, on the counterpart, are the 
remains of what I take to be a portion of the pectoral arch and its 
appended member ; but the parts are so indistinct and fragmentary 
that it would be vain to describe them particularly, 
The teeth (fig. 6) are very numerous and close-set, slender, conical, 
sharply pointed, and either straight or concave inwards. They are 
stronger in the lower jaw than in the upper, and in the anterior than 
in the posterior part of the lower jaw. I could observe no distinct 
traces of those longitudinal grooves which characterize the teeth of 
the larger Labyrinthodonts ; but they seem to have possessed a large 
pulp-cavity. While the teeth of the mandible appear (as I have 
said) to be lodged in distinct though shallow alveoli, those of the 
