ART. 9 A POLLACK WHALE FEOM FLORIDA MILLER. 13 



Greatest diameter of auditory bulla, 223 mm. 



Distance from stapes to tip of anterior petrous process, 173 mm. 



Distance from stapes to tip of posterior petrous process, 360 mm. 



EXPLANATION OF PLATES. 



Skeleton of Balwnoptera borealis. 



Plate 1. 



Skull from above. 



Plate 2. 



Skull from below. 



Plate 3. 



Skull from the side. 



Fig. 1. Skull from right side. 



2. Left mandible from outer side. 



3. Left mandible from inner side. 



4. Iveft mandible from above. 



Plate 4. 



Oblique view of braincase. 



Fig. 1. No. 236680 U. S. Nat. Mus. (Florida). 



2. No. 34871 Amer. Mus. Nat. Hist. (Japan). 



fr. frontal. occ. occipital. 



i. intermaxillary. p. parietal. 



ip. interparietal. sg. squamosal. 



mx. maxillary. sq. sulc. squamosal sulcus. 

 n. nasal. 



Plate 5. 



Cervical vertebrae Nos. 1, 2, and 3. 



Fig. 1. Viewed from the side. 

 2. Viewed from in front. 



Plate 6. 



Cervical vertebrae Nos. 4 (fig. 1), 5 "(fig. 2) and 6 (fig. 3) viewed from in front. 



Plate 7. 



Cervical vertebra No. 7 (fig. 1) and dorsal vertebra No. 1 (fig. 2) viewed from 

 in front. Fig. 2 is slightly moi*e reduced than fig. 1. 



Plate 8. 



Cervical vertebrae Nos. 4 (fig. 1), 5 (fig. 2), 6 (fig. 3), and 7 (fig. 4) ; dorsal 

 vertebra No. 1 (fig. 5) viewed from the side. 



