226 THE AMERICAN MIDLAND NATURALIST 



Pale Pinkish Buff in French Cr. 



Pale Pinkish Buff in Mahoning River. 



Sea-shell Pink in Racoon Cr. 

 In Lake Erie: 



Presque Isle apparently has a larger proportion of Salmon colors 

 than La Plaisance Bay. 



Observation on Sex Correlative Coloration, etc. (5 shells). 



Pearl Blue preponderates in males. 

 ■Females have redder colors, with a large proportion of Buff. 



6. — Anodonta grandis. 



SIMPSON RIDGEWAY. 



Bluish White Pearl Blue, Pale Grayish Blue Violet 



Tinted with Purple Vinaceous Pink, Pale Aniline Lilac. 



Cream Color Pale Pinkish Buff. 



Distribution of Colors as a Whole in Upper Ohio Drainage and 

 L. Erie. (119 shells ). 



Pearl Blue, etc 40% 



Pale Grayish Blue Violet 15 % 



Pale Pinkish BuflF 33% 



Vinaceous Pink.. 5% 



Distribution of Colors as a Whole in Upper Ohio Drainage. (97 

 shells.) 



Pearl Blue, etc 46% 



Pale Grayish Blue Violet, etc 24% 



Pale Pinkish Buff, etc 8% 



Vinaceous Pink, etc 10% 



Distribution in Upper Ohio Tributaries. 



Allegheng Beaver Mgnong. Tuscarawas 



Tribs. Tribs. River River 



Pearl Blue, etc 43 % 25 % 100% 100% 



Pale Grayish Blue Violet, etc.. 33% 50% 



Pale Pinkish BufT, etc.... 21% 25% 



Distribution of Colors as a Whole in L. Erie. (22 shells.) 



Pearl Blue, etc 55% 



Pale Pinkish Buff, etc 15 % 



Pale Grayish Blue Violet, etc 20% 



Pale Aniline Lilac, etc 10% 



Deduction from Tables of Percentages and PI. IIII. 



Pearl blue has a proportionally larger representation in L. Erie 

 than in the Upper Ohio. L. Erie has additionally more pinkish and 



