State Microscopical Society of Illinois · Chicago, Ill. : State Microscopical Society of Illinois · leaf 77
y adopted, I shall continue to usethem. If we pass now to figure 3, we have a more decided depart-ure from the navicula in the curved raphe and more or less curvedventral margin. Let us now look at these frustules in front viewand end view. Figure 4, represents the navicula in front view; aand d… … While the valves, as seen in figures 4 and 5, are slightly convex, thesutural zone, or hyaline part which has upon it the sutural lines, isof the same width at the two ends c and d, figure 4, and again atthe middle of the frustule, as seen in figure 5. Suppose now thesutural zone to become wider at…
Microscopy
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