Verrill, A. Hyatt (Alpheus Hyatt), 1871-1954 · New York, R. M. McBride & co. · leaf 216
e sur-face of the water are practically invisible, whenseen from above, and many of them are so trans-parent that you can scarcely see them, even afterthey have been caught and placed in a jar or pail ofwater. Some of them become quite opaque whenpreserved in alcohol or formaline, however, andmake… … Fig. 24 Fig. 25
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