1896.] 



Trees in Coal Formation of Nova Scotia. 



365 



Hylerpeton intermedium, s. n. 



This species is known as yet only by the mandibles and portions of 

 the skull, which are rather shorter than those of adult individuals of 

 JET. longidentatum, a few scattered bones and portions of the scaly skin 

 and veniral armature. The extremity of the mandible and the 

 cranial bones have the same slightly waved surface as in the other 

 species. Mandibles 3 cm. long, and the teeth, which are about 

 fifteen in each ramus of the lower jaw, are simple, with large pulp 

 cavities : those of the maxillary bone slightly enlarging upwards, 

 and intermediate in form between the long slender teeth of R. longi- 

 dentatum and the thick obtuse teeth of H. Dawsoni. The ventral 

 surface was armed with thoracic plates and long oat-shaped scales 

 closely placed in chevron. The upper parts were covered with a 

 shining skin, in places ornamented with scales or rows of vandyked 

 processes, as in the other species of the genus. The limbs seem to 

 have been well developed. 



Genus Platystegos, Dawson. 



Head broad and short ; orbits very large ; cranial bones deeply 

 sculptured ; teeth strongly plicated and curved, with sharp edges at 

 apices, especially the inner palatal teeth, which are very large; many 

 minute teeth on the vomerine bones ; vertebras ossified, biconcave ; 

 limb bones imperfectly ossified, short ; lower surface protected with, 

 a thoracic plate and thick, densely imbricated oval or quadrate bony 

 scales in transverse, chevron-wise rows ; body above with, thin, 

 rounded scales, concentrically marked. 



Platystegos loricatum, s. n, 



Characters as above. Head about 8 cm. long; when flattened, 

 9 cm. broad across parietal foramen ; squamosal or suprateinporal 

 bones projecting backward much behind the condyles ; parietal 

 foramen small ; orbits large ; length of longest tooth seen 7 mm. ; 

 cranial bones closely and deeply pitted; humerus with very thin 

 bony walls, cartilaginous within, 3*5 cm. long. 



This animal seems, in its teeth and the form and sculpture of the 

 skull, to have been intermediate between Dendrerpeton andBaphetes. 

 The bones of the best specimen are unfortunately dispersed in a very 

 hard matrix. 



These new discoveries have not added much to our list of species ; 

 and they show that no material change of land fauna occurred 

 during the deposition of 400 ft. of beds. I hope in the course of this 

 year to work out, photograph, and prepare for publication the principal 

 portions of the new species, and also some new points relating to 



2 C 2 



