A comparison of the skeletons of the three individuals from the Atlantic
coast of the United States reveals a number of differences of more or
less importance. Were it not for the lack of reliable differences in the
skulls, it might be considered that these variations in other parts of
the skeletons indicated specific difference. I am disposed, however,
since the Barnegat and Newport specimens are of opposite sexes, to regard
them partly as sexual and partly as individual. In the case of the
Charleston specimen (_semijunctus_), the skeleton, besides being
immature, has been very much damaged by careless handling, and nearly all
the bones are somewhat abraded. It is, therefore, only available to a
limited extent for purposes of comparison. As no description of a
_Ziphius_ skeleton from the coast of the United States has, so far as I
am aware, been published hitherto, and as descriptions of skeletons of
Old World specimens are few and rather brief, I shall give below a
detailed comparative description of the American specimens. For the sake
of brevity, I shall refer to each specimen merely by the locality.