This species, which I have taken the liberty of naming after Captain
FitzRoy, the Commander of the Beagle, approaches in some respects to the
_Delphinus superciliosus_ of the “Voyage de la Coquille,” but that
animal does not possess the oblique dark-gray bands on the sides of the
body; it likewise wants the gray mark which extends from the angle of
the mouth to the pectoral fins. In the figure the under lip of the _D.
superciliosus_ is represented as almost white, whereas in the present
species it is black: judging from the figures, there is likewise
considerable difference in the form. The figure which illustrates this
description agrees with the dimensions, which were carefully taken by
Mr. Darwin immediately after the animal was captured, and hence is
correct.
“This porpoise, which was a female, was harpooned from the Beagle in the
Bay of St. Joseph, out of several, in a large troop, which were sporting
round the ship. I am indebted to Captain FitzRoy for having made an
excellent coloured drawing of it, when fresh killed, from which the
accompanying lithograph has been taken.”—D.