File:Recent memoirs on the Cetacea pl. 3.jpg

Fig.

1. The skull of the thirteen feet long newborn Greenland whale , six times diminished,

2. The skull of the forty-three feet long hump-back (Megaptera boops, Fbr.), twenty times diminished.

3. The skull of the fifty-three and two thirds feet long fin-whale (Balaenoptera musculus), J. Miill., Rorqual de la Méditerranée, Cuv.), twenty times diminished.

All three seen from above. The letters have the following significations in all the figures:

:b. That part of the parietal which covers the superior surface of the orbital process of the frontal.

:f. The orbital process of the frontal,

:'f. The middle piece ,,

:i. The intermaxillary.

:k. The condyle of the occipital.

:l. The lachrymal.

:m. The portion of the superior maxillary belonging to the superior surface of the upper jaw.

:m'. The posterior process of the superior maxillary.

:m°. The external „ „

:n. The nasal bone.

:o. The squamous portion of the occipital,

:o'. The articular „ „

:q. The condyle of the lower jaw.

:r. The rami „ ,,

:t. The lateral process of the temporal.

:v. The internal surface of the vomer, exposed by the removal of the primordial vomer,

:x (in fig. 1). Ligaments between the lateral processes of the frontal and the temporal.