

A NEW FOSSIL PORPOISE FROM MARYLAND. 193 



PLATE XVIII 



Fig. 1. Skull, posterior aspect. 

 Fig. 2. Mandible, right ramus, exterior. 

 Fig. 3. Mandible, left ramus, interior. 

 Fig. 4. Mandible, superior aspect. 

 About one-half natural size. 



PLATE XIX. 



Fig. 1. Lower teeth. Natural size. 



Fig. 2. Upper teeth. Natural size. 



Fig. 3. Atlas, anterior aspect. 



Fig. 4. Atlas, posterior aspect. 



Fig. 5. Axis, anterior aspect. 



Fig. 6. Axis, posterior aspect. 



Fig. 7. Third cervical vertebra, anterior aspect. 



Fig. 8. Third cervical vertebra, posterior aspect. 



Fig. 9. Fourth cervical vertebra, anterior aspect. 



Fig. 10. Fourth cervical vertebra, posterior aspect. 



Fig. 11. Fifth cervical vertebra, anterior aspect. 



Fig. 12. Fifth cervical vertebra. Dosterior a&nect. 



Fig 



Sixth and seventh cervical vertebrae in the matrix, anterior aspect, 

 vertebrae about seven-tenths natural size. 



PLATE XX. 



m^ ¥ l G& I to . 9 \ T horacic vertebrae > lateral aspect. Fig. 1, first; fig. 2, third; fig. 3, fourth; fii 

 fifth; fig. 5, sixth; fig. 6, seventh. * 



Figs. 10-14. Lumbar vertebrae, lateral aspect. 



Figs. 15-19. Caudal vertebrae, lateral aspect. Fig. 15, first caudal. 

 About two-thirds natural size. 



PLATE XXI. 



Figs. 1- 9. Thoracic vertebrae. (Fig. 5 should stand behind fig. 6 instead of in front of it.) 

 Pigs. 10-14. Lumbar vertebrae. 

 Figs. 15-19. Caudal vertebrae. 



aspect. About seven-tenths 



PLATE XXII. 



Figs. 1- 6. Thoracic vertebrae, anterior aspect. 

 Figs. 7-12. Thoracic vertebrae, posterior aspect. 

 fourth; figs. 4 and 10, fifth; figs. 5 and 11, seve 

 About seven-tenths natural size. 



figs 



XXIII 



Pigs. 1- 6. Lumbar vertebrae, anterior aspect. 



au GS * ^ _11 - Caudal vertebrae, anterior aspect. 

 About seven-tenths natural size. 



PLATE XXIV. 

 Ribs. About two-thirds natural size. 



Fig. 1. Right scapula, internal surface. 



£ig. 2. Left humerus, external surface. 



Fig. 3. Radius. 



Fig. 4. Ulna. 



Fig. 5. Hyoid bones. 



Fig. 6. Left periotic bone, internal aspect 



Fig. 7. Left • - ■ y 



XXV 



water- 08 ° ot ^ er periotic bones of the same species, from Chesapeake Beach. More or lest 



vl„' }?* S- 8 ! 1 * t y m P anic bone. Inferior aspect. 

 Fir ii Rjght tympanic bone. Exterior aspect. 

 Water-w Other fragmentary tympanic bones of the same species, from Chesapeake Beach. 



Figs. 1-4, about seven-tenths natural size: fie. 5. about two-thirds natural size: fies. 6-17. natural 



JOURN. ACAD. NAT. SCI. PHILA 



