136 Geological Society. 
The reputed humerus is the interclavicle. 
scapula is the humerus. 
19 9 
3 35 supra-scapula is the left coracoid (fig. 2). 
af 5 55 » » right scapula (fig. 1). 
y i. right and left elavicles are the ribs, 
p ts right and left coracoids are the pre-coracoid and 
coraco.d of the right side. 
Five digits are identified in place of four in 1878. These osteo- 
logical identifications are inconsistent with reference of the type to 
the Labyrinthodontia, and it is accordingly described as a new genus, 
which is placed in association with Procolophon as a separate family 
in the tribe Procolophcnia. 
The Author discusses various views which have been expressed 
with regard to the position of the Labyrinthodonts. He has already 
separated these animals from the Amphibia and combined them with 
the Ichthyosauria in a group of reptiles named Cordylomorpha, and 
he enumerates a series of characters which constitute so close a link 
between the two types ‘that it is not possible, in the absence of 
evidence, to conceive of their being referred to different classes of 
animals.’ 
‘But if the order Labyrinthodontia is transferred to the Reptilia, 
it is then manifest that by including such genera as Branchiosaurus 
and Archegosaurus, in which gill-arches are found, it introduces into 
the Reptilia a character hitherto unknown,and commonly regarded as 
Amphibian. ... If the osteology of an ordinal type is Reptilian, it 
cannot be placed in the Amphibia, because two or three genera, or 
the whole group preserve gill-arches. ... The Labyrinthodontia may 
or may not be a homogeneous subclass or order, though the cireum- 
stance that many writers have separated its groups on different 
principles, and into a varying number of orders, is some evidence 
that it includes a wide range in character....In no part of the 
skeleton is there a close correspondence between living Amphibia, 
which are probably unknown before the Tertiary period, and the 
extinct Labyrinthodontia, which are only known with certainty in 
the Carboniferous, Permian, and Triassic periods of time.’ 
‘Tf the sub-orders of Labyrinthodoatia are sub-orders of Reptilia 
and not of Amphibia, the transition which Parecasaurus exhibits 
from Labyrinthodonts to Mammals ceases to be an anomaly.’ 
‘The close resemblance of form of the bones in the several parts 
of the skeleton now described with Monotremata and Anomodontia 
makes the border-line between Reptiles and Mammals more difficult 
to define.’ 
The fossil is identified as an Anomodont reptile, chiefly on the 
pasis of resemblance to Procolophon and Pareiasaurus. It is shown 
not to be a mammal by the large parietal foramen, the composite 
structure of the lower jaw, and the presence of the prefrontal bone. 
Tt differs from known Anomodonts in making a somewhat closer 
approximation to Monotreme mammals than has hitherto been 
evident, and this correspondence extends to successive segments of 
both the fore- and hind-limbs. 
