. Edinburgh New Philosophical Journal . IDEAL GRADATION OF THE CLASS OF MAMMALIA. The trunk of Edentata sends out three diverging stems, the Monotremata, the Edentata proper, and the Tardi- grada :* an herbivorous stem (Tardigrada s. Gravigrada), * The graphic representation on a plane surface has caused the stem of Tar- digrada to be separated from its trunk; but in bringing into contact both edges of the plate, we would obtain a figure similar to that of Marsupialia. Instead of a flattened surface, we want an ideal cone for both trunks.

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Keywords: ., bookcentury1800, bookcollectionbiod, bookdecade1850, bookyear1853