THE CARBONIFEROUS. 59 



preserved mandible shows eighteen teeth, which are strongly inclined 

 backward. The scales are very narrow, and there is a large thoracic 

 plate. The general form of body may have been as in the last specie,-, 

 but the skull was probably narrower and the feet longer. 



Another species of this genus, or belonging to a genus intermediate 

 between it and Hylonomus, is represented by a confused mass of bones 

 showing long and narrow jaws, armed with short and blunt teeth, of 

 which at least thirty occur on each side of the lower jaws. The 

 sculpture of the bones is as in the previous species, but the pulp- 

 cavities of the teeth are smaller and their walls stronger, and they 

 show no sculpture on the apex ; in which respects they resemble those 

 of Hylonomus. The vertebra? also are more elongated, and the femur 

 is a large bone indicating a powerful hind limb. The abdominal 

 scutes are very long and narrow, resembling slender semicylindrical 

 rods, a point in which this species differs from all the others found 

 with it, although it resembles some of those found in Ireland and 

 Ohio. This species I would name provisionally, in allusion to the 

 form of its teeth, Hylerpeton curtidentatum. 



In all these species of Hylerpeton the teeth are simple, and 

 are anchylosed to the bone and placed in linear series in a shallow 

 groove. 



3. Remains of Dendrerpeton. 



The remains of this genus will afford additional facts as to the 

 differences in individuals of various ages, and as to the details of the 

 skeleton in the species D. Owen/', previously known by only one im- 

 perfect example. The specimen now found would seem to show that 

 it resembled very much the larger species, except in the form of the 

 teeth and scales. But the most interesting facts presented by a cur- 

 sory examination of the specimens relate to the skin and its appendages. 

 It is now evident that in addition to the abdominal and gular scales, 

 Dendrerpeton possessed thoracic plates of considerable size, resem- 

 bling those of other labyrinthodonts. The large mass of skin found 

 in the tree of 1876, taken in connection with the smaller portions 

 found on previous occasions, and described in detail in my " Air- 

 breathers of the Coal-period," enables us to form a very good general 

 idea of the appearance and clothing of the animals of this genus. To 

 the naked eye the skin presents a shining and strongly rugose surface, 

 reminding one of that of modern newts when contracted by immersion 

 in alcohol, though on a coarser scale. Under the lens, the surface 

 appears granular, and with a higher power the granulation is seen to 

 result from minute scales embedded in. the cuticle, and much smaller 



