EXPLANATION OF PLATE 13, 



Lamps of Norton Sound. 

 Fig. 1. Sandstone lamp. 



(Cat. No. 49110, U.S.N.M. Korton Bay. Collected by E. W. Nelson.) 



Fig. 2. Small lamp. 



(Cat. No. 44:i38, U.S.N.M. Norton Soniul. Collecterl by E. W. Nelson.) 



Fig. 3. Sandstone lamp. 



(Cat. No. 30761, U.S.N.M. St. IMicbaels, Norton Sound. Collected by L. M. Turner.) 



Fig. 4. Lamp of concretion. 



(Cat. No. 43470, U.S.N.M. St. Michaels, Norton Sound. Collected by E. W. Nelson.) 



