CHART X. 1,000 LITTORINA LITTUREA. NEWPORT, R.I. 

 BE 



18-19 mm. 



16-17 mm. 



-15 mm. 



I'u Si 82 83 84 85 86 87 88 89 go 91 92 93 94 95 96 97 yS 99 100 101 102 103 104 105 106 



