. Bulletin - United States National Museum. Science. SHARP-NOSED CETOTHERE 167 are directed obliquely outward and backward. These grooves serve as channels for the nutrient vascular vessels and nerves that supply the palate and attached baleen of the living mysticetes. Except for a relatively few short ones more anteriorly along the outer border, the majority of. Figure 76.—Ventral view of skull, USNM 23690, of Aglaocetus patulus. For abbreviations, see figure 74. the anterior grooves run lengthwise or nearly so. The right maxillary terminates 1370 mm. anterior to the posterior margin of the v
. Bulletin - United States National Museum. Science. SHARP-NOSED CETOTHERE 167 are directed obliquely outward and backward. These grooves serve as channels for the nutrient vascular vessels and nerves that supply the palate and attached baleen of the living mysticetes. Except for a relatively few short ones more anteriorly along the outer border, the majority of. Figure 76.—Ventral view of skull, USNM 23690, of Aglaocetus patulus. For abbreviations, see figure 74. the anterior grooves run lengthwise or nearly so. The right maxillary terminates 1370 mm. anterior to the posterior margin of the vomer and the right premaxillary extends 95 mm. beyond the maxillary. The distance from the anterior end of the right maxillary to the anterior edge of the optic channel at the base of the right supraorbital process is 1230 mm. The inner edges of the opposite maxil- laries commence to diverge slightly on the ventral surface of the rostrum 115 mm. behind the anterior end of the right maxillary. At a point 130 mm. in advance of the posterior end of its horizontal plate the ventral keel of the vomer develops a narrow flattened surface, which is extended backward at the same horizontal level for 75 mm., and then, as a con- tinuing thin vertical partition between the choanae, diminishes in vertical diameter until it disappears about at the posterior end of the vomer. The horizontal plate of the posterior end of the vomer conceals the basisphenoid from a ventral view and laterally is in contact with the corresponding edge of the vaginal process of the pterygoid. Although the posterior border of each palatine is broken off and the precise termination of the anterior end uncertain on account of sloughing off of the thin borders of this bone, the anteroposterior diameter of each palatine was at least 300 mm. Each palatine anteriorly and externally over- spreads the ventral surface of the corresponding maxillary. Posteriorly each palatine is suturally united with the pterygoid which con
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