Hylonomus lyelli Dawson. 1, maxillse and skull bones; la, sternal bones; 2, mandible; 3, humerus, ribs, and 

 vertebra; 4, posterior limb; 5, pelvis; 6, caudal vertebra. Nearly natural size. Erect tree, Coal 

 formation. South Joggins, Nova Scotia. Photograph by Dawson, published through the courtesy of 

 Dr. Arthur Willey. Original in the British Museum. 



