534 ON CARBONIFEROUS LABYRINTHODONTS 
I propose the name of Pholidogaster pisciformis for the genus and 
species. 
The specimen (Pl. XI. [Plate 37] fig. 3) is in a very indifferent state 
of preservation, and is so disposed in the matrix as to show the under 
or ventral surface of the head and body. Its total length is about 43 
or 44 inches, of which the head occupies less than 4th, the ramus of 
the lower jaw being 7 inches long. At its hindmost or widest part, 
the head measures about 5 inches in transverse diameter. In shape it 
resembles an oval bisected along its short diameter, the snout being 
completely rounded off. In front of the symphysis of the mandible, 
the under surface of the premaxilla is visible, bearing the stumps of 
two teeth. These teeth are situated at some distance (about o'7 of 
an inch) from the middle line, and pass outside the ramus of the 
mandible. They are conical, and round in transverse section. 
Neither is entire ; but the fragment on the right side is the longer 
(o'2 inch), and is slightly curved, its convexity being directed for- 
wards. The basis of the teeth are marked by strong longitudinal 
grooves. 
The right ramus of the mandible is better shown than the left, 
though both rami are more or less distorted and crushed. The 
angular piece is large, and has the form and sculpture common 
among Labyrinthodonts. 
Between the hinder parts of the rami of the mandible, but nearer 
the left than the right, are two bony plates, having the form of right- 
angled triangles, with their bases backwards and their perpendicu- 
lars directed inwards, close to and parallel with one another. More 
of the right plate is visible than of the left, and its outer angle is 
seen to be produced into a process which is bent at a right angle 
towards the dorsal side of the body. A coarse sculpture, consisting 
of ridges which radiate fanwise from the outer angle of each plate 
towards its inner edge, and anastomose, so as to leave elongated pits, 
marks the surface of these plates. 
I conceive that these correspond with the lateral thoracic plates of 
the Labyrinthodonts, thrown out of their proper places and approxi- 
mated, so as to hide the anterior half of the lozenge-shaped median 
plate, distinct traces of the posterior half of which plate appear to 
me to be still visible. 
The ventral armour commences behind these thoracic plates, and 
forms an oblong sheet of scales, about 4 inches broad and 17 inches 
long, while each scale may measure half an inch long by ‘1§ broad. 
When the scales are well preserved and separately distinguishable, 
they are seen to be somewhat oat-shaped, the outer end being much 
