CHART XI. 1,000 LITTORINA LITTOREA. BRISTOL, R.I. (SHINGLE) 



22-mm. 





iS-i<j mm. 



16-17 mm. 



-15 mm. 



So Si 82 83 84 85 86 87 88 89 go 91 92 93 94 95 96 97 98 99 100101102103104105106 



