1 (See Proboscidea.) The upper tusks of the early mastodons differ from those of elephants in retaining longitudinal bands of enamel. ( 2 X 300.) by a nervure and traversed by two A, With  bladder, b, longitudinal nervures, or the nervuration protruded; B, retracted, may be altogether degenerated.
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Compute the cost per page of the paper you use. For example, if you purchase paper by the case, a standard case contains five reams of 500 sheets each for a total of 2,500 sheets. If the case costs $30, then $30 divided by 2,500 equals $0.012 or 1.2 cents per page.aintenance items tend to figure less in your long-term per-page printing costs, but are necessary for an accurate number. If the cost of paper is 1.2 cents per page, toner is 1 cent, and the printer drum is 0.27 cents, the total per-page cost is 2.47 cents. Step 6.