[3°]

The above differences would perhaps affect the outline of the terga, but I am not able to follow the precise manner; nor should I have thought them sufficient to have produced the amount of variation presently to be described in the terga; but possibly other scuta may vary still more. At first I concluded that the upper part of the inner occludent edge, which in Var. I ll is deeply furrowed, received in it the occludent edge of the tergum (as the furrow on the tergal side of the apex of the scutum receives the edge of the tergum in the recent Pollicipes mitella), but this on consideration I do not think can possibly be the case, although it would amply account for the variation in the terga.