The substitution of other terms in the anatomical series there described—amœba, volvox, etc.—would not affect this result.
This, it is affirmed by Dr. Hicks, takes place in volvox, under circumstances which suggest a vegetable transformation.
Of the forms that are united in colonies one of the best known is volvox (Fig. 10).
In some cases (volvox) the cluster, or the compound plant, is round and moves briskly in the water, closely resembling an animal.
In all of these the structure of the cells is essentially as in volvox.
If a half-inch lens be now used, the structure of the volvox begins to be exhibited.
But in volvox division of labor and differentiation of structure have taken place.
One of the best examples of this secondary grade of complication is presented by the spherically aggregated cells of volvox.
Part of the surface of a colony of volvox globator, L. (Volvocidae), showing the intercellular connective fibrils.
volvox is also a spheroidal organism, composed often of a very large number of flagellated cells.
1798, from Latin volvere "to roll," from PIE root *wel- "to turn, revolve," with derivatives referring to curved, enclosing objects (cf. Sanskrit valate "turns round," ulvam "womb, vulva;" Lithuanian valtis "twine, net," apvalus "round;" Old Church Slavonic valiti "roll, welter," vluna "wave;" Greek eluo "wind, wrap," helix "spiral object," eilein "to turn, squeeze;" Gothic walwjan "to roll;" Old English wealwian "roll," weoloc "whelk, spiral-shelled mollusk;" Old High German walzan "to roll, waltz;" Old Irish fulumain "rolling;" Welsh olwyn "wheel").