REMAINS IN THE COAL-FORMATION OE NOYA SCOTIA. 
635 
and maxillary teeth conical, grooved at apex. Abdominal scales slender and rod-like. 
One species, Fritschia curtidentata. 
5. Amblyodon. —A genus characterised by stout cylindrical teeth, blunt at the 
apices ; but otherwise imperfectly known. 
The Labyrinthodontia are represented in these trees by the genus Dendrerpeton 
alone. 
Dendrerpeton may be characterised as having a lizard-like form of body, with 
the anterior and posterior extremities nearly equal; the skull somewhat elongate with 
small orbits, and the nostrils placed at the front. The cranial bones sculptured. The 
teeth plicated at the base, more especially on their inner sides. A series of large 
teeth on the palate. The body was covered above with imbricated horny scales and 
had lappets or pendants at the sides. The abdomen was protected by thin bony 
scales semi-elliptical or oat-sbaped in form, and arranged in a chevron pattern. There 
was probably also a thoracic plate. Two species, D. Acadianum and D. Oweni. 
Of the above species six were more or less perfectly known previous to the recent 
explorations, but additional material has been obtained illustrating some of their 
characters. In the following notes these new facts will be stated, with more full 
descriptions of the new species. 
1 . Hylonomus Lyelli, Dawson (Plate 39, figs. 1 to 14, and fig. 27 ; also Plate 45, fig. 140). 
[Journal of Geological Society of London, vol. xvi., 1859, p. 268. ‘Air-breathers of 
the Coal Period,’ 1868, p. 40. ‘Acadian Geology,’ 3rd edition, 1880, p. 370.] 
This species is by much the most abundant in the erect trees examined. It is the 
type of the genus Hylonomus and of the family Microsauria. Its characters may 
now be given somewhat completely, as follows :— 
General form lizard-like, with the hind limbs rather larger than the fore-limbs. 
Length when mature, 5 to 6 inches. 
Head somewhat elongate; bones of skull smooth or with microscopic striae, per¬ 
fectly united, except at parietal foramen. Occipital condyle double, and apparently 
bony. Teeth simple, conical, numerous, about forty in each mandible, and nearly equal, 
except that a few of the anterior ones are rather larger than the others. The teeth 
are anchylosed to the jaw in a furrow protected by an external bony plate. 
Vertebrae with cylindrical bodies, slightly concave at the ends. When partly 
exfoliated they appear hourglass-shaped, in consequence of the internal cartilage 
having the form of two cones attached by their apices. Zygapophyses conspicuous 
above; neural arches united to the bodies of the vertebras, and with broad neural 
spines. Dorsal vertebrae with strong lateral processes. Caudal vertebrae apparently 
simple and cylindrical. Number of vertebrae in neck and trunk about thirty. 
Bibs long and curved, with capitulum and tubercle, cartilaginous within. 
