EXPLANATION OF PLATE 12. 



Figs. 1, 2. Millstones. 



(Cat. Ko. 151827. U. S. N. M. Bagdad, Turkey. C:ollected by Rev. Dr. John P. Peterf*.) 



Fig. 3. Goatskin Waterbag. 



(Cat. No. 74627, U. S. N. M. Palestine. Collected by George W. Samson.) 



