AMPHIBIA. 
49 
imperfect ossification, nearly all the skulls of these animals Wall-case 
are flattened by pressure in the rocks. Other remains of Tab ^' case 
Loxomma and Anthracosaurus are exhibited from the English v. 
Coal Measures, and these include short biconcave vertebrae 
which resemble those of Ichthyosaurus, except that they^are 
Fig. 45.—Vertebra of Euchirosaurus rochei , left lateral (A) and posterior 
(B) views, from the Lower Permian of France; about nat. size. al. 
lateral expansion of neural arch ; c. facette for rib; c.r. neural canal; 
d. transverse process of neural arch; ic. hypocentrum or intercentrum; 
n. neural spine; not. space originally occupied by notochord; pl.c. 
pleurocentra; s. suture between neural arch and spine; z.a., z.p., 
anterior and posterior zygapophyses. (After A. Gaudry.) 
pierced by a hole for a remnant of the notochord. In Wall- 
case 19 there is also an incomplete skeleton of Pholidogaster 
from the Lower Carboniferous of Scotland. The limbs of the 
Lower Carboniferous Labyrinthodonts are unknown. 
Sub-order 2.—Mierosauria. 
In Upper Carboniferous and Lower Permian rocks there are Wall-case 
remains of numerous small lizard-shaped Stegocephalia, Tab }^‘ caB( 
named Mierosauria (“ little lizards ”), which are in some res- a jj~ ase 
pects intermediate between the Amphibia and the true Reptilia. 
E 
