. Bulletin. Science. BLUE MARLIN FROM LATE MIOCENE OF ORANGE COUNTY 49 a-a. Fig. 2. Skull of Makaira nigricans Lacepede 1802 (OCPC 31001), Capistrano Formation, late Miocene, Orange County, California. A. Dorsal view; B. Ventral view; C. Cross section of rostrum at L; D. Cross section of rostrum at L. See text for definition of abbreviations. Scale bar equals 10 cm (A, B) and 5 mm (C, D). (mx) is better preserved than its counterpart, with the former containing both the articulation for the vomer (fv) and the internal process (ipr). The right dentary (de) is well preserved, except for
. Bulletin. Science. BLUE MARLIN FROM LATE MIOCENE OF ORANGE COUNTY 49 a-a. Fig. 2. Skull of Makaira nigricans Lacepede 1802 (OCPC 31001), Capistrano Formation, late Miocene, Orange County, California. A. Dorsal view; B. Ventral view; C. Cross section of rostrum at L; D. Cross section of rostrum at L. See text for definition of abbreviations. Scale bar equals 10 cm (A, B) and 5 mm (C, D). (mx) is better preserved than its counterpart, with the former containing both the articulation for the vomer (fv) and the internal process (ipr). The right dentary (de) is well preserved, except for most of its denticles. The right angulo-articular (a-a) is incomplete posteriorly and is rotated clockwise with respect to the right de. In ventral view (Figs. 2B, 3B), the distal segment of the rostrum is completely covered with denticles for approximately 261 mm (DZ) and then the denticles divide to form a narrow edentulous zone along the midline that terminates at the division (VSPM) of the right and left maxillae. Most of the right mx, including a large part of the maxillary (posterior) process, is visible. The rugose joint surface on the ventral margins of the left pn and na that articulates with the left mx (triangular region) is well preserved. The interior (ventral) surface of the left fr contains a fragment of the lateral ethmoid (le) and sphenotic (sph). The lateral surface of the left quadrate (qu) is complete; however, the entire element has undergone deformation that gives it a slightly melted appearance. The occipital condyle and ventral surface of the basioccipital (bo) are present. The lower jaw is complete from the distal tip of the predentary (pd) to the posterior part of the de. A small portion of the left a-a and most of the right a-a are visible, and both have been displaced and rotated from their normal anatomical position with respect to their dentaries. A large fragment of the left pterygoid (ecto- and entopterygoid) rests on the right lower jaw. Two fl
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