6o S. W. WILLISTON 



my restorations of the creature with that part of the body hidden 

 in the water or under the ferns. Its skin was doubtless bare, and 

 its tail more or less flattened for use in the water, like that of a 

 gigantic salamander, its nearest living modern relative. 



There can be no doubt that the creature was amphibious, 

 though probably not strictly aquatic in habit, like Trimerorhackis, 



Fig. 2. — Skull of Trimerorhackis insignis, an aquatic amphibian about three feet 

 in length. 



remains of which are sometimes found in bone beds in great num- 

 bers. This animal, of which a restoration will be given in a future 

 number of this Journal, had a more elongate and flattened head 

 with the eyes far in front, and with almost vestigial limbs, as has 

 Diplocaulus, which is often found associated with it. 



Another animal of this order, which must be placed in a family 

 all its own, the Trematopsidae, is shown in Fig. 3, as based upon 



