R. I. A. PROC. 



VOL. IX. PLATE 



Fig. 1. 



No. 1 measures 6| inches in diameter from outside to outside of the circular line. 



„ 2 do. 6* do. do. 



, 3 do. 6| do. do. 



„ 4 do. 4§ do. do. 



,. 5 do. 6i do. do, 



,, 6 do. 4f do. do. 



„ 7 do. 9 * do. do. 



Fig. 2. 



No. 1 measures of inches in diameter from outside to outside of the circular lines. 



2 do. 9 do. do. 



3 do. 8 do. do. 



4 do. 9 do. do. 



5 do. 7| do. do. 



6 do. 5 do. do. 



7 do. 4| do. do. 



