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132. Tryon, G. W. Jr., A Monograph of the F. W. Mollusca of the U. S., 



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137. Vanatta, E. G., The Geographic Distribution of Planorbis umbili- 



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138. Vanatta, E. G., Planorbis Bicarinatus and Pleurodonte Angulata. 



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139. Vanatta, E. G., Viviparus contectoides in Philadelphia. Nautilus, 



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140. Vanatta, E. G., Rafmesque's Types of Unio. Pr. A. N. S. P., 1915, 



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142. Walker, Bryant, The Shell-bearing Mollusca of Michigan. Nauti- 



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143. Walker, Bryant, Changes with Growth of Lithasia obovata (Say). 



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144. WalkKr, Bryant, The Genuine Planorbis Corpulentus Say. Naut- 



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149. Walker, Bryant, Notes on Planorbis, I. Nautilus, XXI, 1907, pp. 



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