148 
JOURNAL OF MAMMALOGY 
Pomatodelphis gen. nov. 
Diagnosis, — Long-beaked dolphins resembling Schizodelphis in general form 
of the skull except that the rostrum has a convex expansion of the maxillary 
outline at the proximal end of the tooth rows; combined width of lower jaws 
narrower than the upper so that the lower tooth rows close inside the upper (like 
the lid of a pot — rw/xa); teeth of lower jaw directed upward into the maxillary, 
where the tips of the more posterior are received in shallow pits, instead of being, 
as in Schizodelphis, directed outward and interlocking with the maxillary teeth 
outside the tooth rows. 
Genotype, — Pomatodelphis inaequalis sp. nov. 
Pomatodelphis inaequalis sp. nov. 
Plates 10, 11 
Type, — A fragment, 15750 M.C.Z., from the base of the right maxilla, 114 mm. 
long, comprising one-half the breadth of the palate, from Brewster, Polk County, 
Florida. Gift of Amalgamated Phosphate Co., through Anton Schneider and 
Thomas Barbour. 
Description. — The type fragment includes thirteen small and much compressed 
alveoli, of which the posteriormost are close together but the more anterior are 
much farther apart. All are round-edged and contract forward to a point; they 
are mere slits and probably did not support functional teeth. Internal and 
parallel to this row of thirteen alveoli is a series of some ten or eleven shallow 
pits made by the tips of the mandibular teeth, which closed perpendicularly 
against the maxilla inside the line of the upper tooth row. The palate itself is 
quite flat. The external border of the maxilla is abruptly and strongly rounded. 
Three specimens in the collection of the Florida Geological Survey supplement 
the type most acceptably. They comprise a cranium, which though in several 
fragments v/ants little more than the terminal part of the beak and the middle 
portion of the brain case; a second imperfect rostrum, comprising most of the 
base of the beak; and a third fragment from near the tip of another rostrum. 
From these a fairly clear idea of the cranium may be gained. 
The summit of the cranium instead of culminating in the elevated nasals, as 
in modern Delphinid^, is formed by a transverse crest along the line of union 
of the frontals and the supraoccipital. The latter seems to have been nearly 
perpendicular to the long axis of the cranium, so that the back of the skull is 
rather squarely truncate. The interparietal appears medially at the apex of the 
skull, as a narrow transverse bone wedged in between thje large supraoccipital 
and the frontals. It is about 40 mm. from side to side and 6 mm. in antero-pos- 
terior extent in the midline, tapering to a point at each side. In front of it appears 
a slightly depressed rectangular field formed by the frontals, some 25 mm. square 
against the anterior side of which abut the remains of the nasals. 
The blowholes are embraced by the proximal ascending portions of the inter- 
maxillse, the tips of which are here contracted to a blunt point in contact with 
the middle of the frontal on either side, some 10 mm. in advance of the transverse 
occipito-frontal ridge. A large foramen opens under the posterior margin of 
