PLATE II. 



(The specimens are figured natural size except wlien otherwise stated.) 



Figs. 1,2. Valvaia ieh'coidea T)a.U, magnified four diatneters. The umbilicus 

 is partly hidden hy a calcareous deposit ; p. 123. 



3. Lymnaa fetersi Dall ; p. 66. 



4, 5. Lymnira anticostiana Dall; p. 79. 



6. Lymncea ? perfolita Dall ; p. 78. 



7. 9. Lymncea atkaensis Dall ; p. 66. 



8. Lymnrea ? perpolita Dall, magnified two diameters; p. 78. 

 10, II. Planorbula christyi TisW, magnified two diameters; p. 99. 



(156) 



