230 BAL^NOPTERA MUSCULUS. 



Explanation of Plates. 



PLATE VI. 



Fig. 1. Superior aspect of skull ; a and h mark certain prominences on tbe supra-occipital mentioned in 

 the text ; c, edge of parietal ; d, frontal ; e, orbital plate ; /, vomer ; g, superior maxilla ; A, intermaxilla ; i, 

 nasal. 



Fic^ 2. Inferior aspect of skull ; a, cxoccipital ; &, articular portion of squamosal; c, periotic ; f/, alisphe- 

 noid ; e, orbital plate ; /, groove fi-om optic foramen ; g, vomer ; A, palatal ; j, superior maxilla ; J, intermax- 

 illa ; Ic, molar ; I, lachrymal. 



Fig. 3. Anterior aspect of Atlas; a, tubercle at origin of transverse process. 



Fig. 4. Superior aspect of Atlas ; a, tubercle at end of articular surface ; 5, true atticular surface ; c, same 

 as in fig. 3. 



Fig. 5. Anterior aspect of Axis ; a, odontoid ; h, points to tuberosities on diapophyses ; c, true articular 

 process. 



Fig. 6. Posterior aspect of Axis; a, zygapopbysis. 



Fig. 7. Lateral " " 



Fig. 8. Last (63d) Vertebra. Natural size. 



Fig. 9. First rib. 



Fig. 10. Anterior surface of Sternum. 



Fig. 11. Humerus. 



Fig. 12. Radius. 



Fig. IB. Ulna. 



Fig. 14. Left Pelvic Bone (drawn inverted). 



PLATE VU. 



Fig. 1. Dorsal aspect of Whale. 



Fig. 2. Ventral « " " 



Fig. 3. Lateral " « " 



Fig. 4. Blowholes. 



Fig. 5. Eye. 



