U.S. NATIONAL MUSEUM 



BULLETIN 294, PLATE 7 



6 



Dorsal Views of Dorsal Vertebrae. USNM 23794, Thinocetus arthritus 



1, second dorsal; 2, third dorsal; 3, fourth dorsal; 4, fifth dorsal; 5, sixth dorsal; 6, seventh dorsal; 7, eighth dorsal; 8. ninth 



dorsal; 9, tenth dorsal; 10, eleventh dorsal. 



