CHART V. 1,000 LITTORINA LITTOREA. CASCO BAY, ME. 



- 22-mm. 



18-19 mm. 



16-17 mm. 



-15 mm. 



80 Si 82 83 84 85 86 07 88 89 90 91 92 93 94 95 96 97 98 99 100101 102 103 104 105 106 



