38 PROCEEDINGS OF THE NATIONAL MUSEUM. vor.. 63, 



Platk S. 



Fig. 1. Right tympanic of Platanista gangetica Lebeek, External view ; 2, 

 Rigtit tympanic of Zarhachis flagellator Cope, External view ; 3, Left tympanic 

 of Platanista gangetica Lebeek, Inferior view; 4, Left tympanic of Zarhachis 

 flagellator Cope, Inferior view ; 5, Atlas of Zarhachis flagellator Cope, Dorsal 

 view. Figs. 1^, about tu natural size ; Fig. 5, about Mj natural size. 



Plate 9. 



Fig. 1, Basihyal, ceratohyals, and tbyrohyals of Zarhachis flagellator Cope 

 Dorsal view ; 2, Right stylohyal of Zarhachis flagellator Cope, Dorsal view ; 3, 

 Left stylohyal of Zarhachis flagellator Cope, Dorsal view. All figures about 

 % natural size. 4, Paddle bones of Zarhachis flagellator Cope. The bones have 

 been arranged in a graded series, but do not represent necessarily their true 

 positions. About tt natural size. 



Plate 10. 



Vertebral column and ribs of Zarhachis flagellator Cope. Viewed as found 

 in the matrix. 1, Atlas ; 2, First dorsal ; 3, Second dorsal ; 4, Third dorsal ; 5, 

 Fourth dorsal; 6, Fifth dorsal; 7, Sixth dorsal; 8, Seventh dorsal; 9, Eighth 

 dorsal ; 10, Nintli dorsal ; 11, Tenth dorsal ; 12, First lumbar ; 13, Second 

 lumbar ; 14, Third lumbar, centrum missing ; 15, Fourth lumbar ; 16, Posterior 

 caudal ; 17, Posterior caudal ; 18, Posterior caudal ; 19, First rib, right side ; 

 20, Fourth rib, right side; 21, Third rib, left side; 22, Fourth rib, left side; 

 23, Fifth rib, left side; 24, Eighth rib, left side; 25, Ninth rib, left side; 26, 

 seventh rib, right side. All elements about Ys natural size. 



Plate 11. 



Fig. 1, Presternum of Zarhachis flagellator Cope, Superior view ; 2, Mesoster- 

 num of Zarhachis flagellator Cope, Superior view. Both figures about M: natu- 

 ral size. 



Plate 12. 



Fig. 3, Posterior view of atlas of Zarhachis flagellator Cope; 4, Anterior view. 

 Both figures about % natural size. 



Plate 13. 



Dorsal vertebrae of Zarhachis flagellator Cope. About % natural size. Fig. 

 1, Eighth dorsal vertebra, Anterior view ; 2, Fourth dorsal vertebra, Anterior 

 view, showing missing epiphysis. 3, Fourth dorsal vertebra, Lateral view; 4, 

 Eighth dorsal vertebra, Lateral view. 



Plate 14. 



Dorsal vertebra of Zarhachis flagellator Cope. About Y^ natural size. Fig. 

 1, Fourth dorsal vertebra, Posterior view; 2, Eighth dorsal vertebra. Posterior 

 view. 



Plate 15. 



Ribs of Zarhachis flagellator Cope, Left side. About % natural size. Fig. 

 1, Sixth rib ; 2, Seventh rib ; 3, Eighth rib ; 4, Ninth rib ; 5, Tenth rib ; 6, Fourth 

 lumbar vertebra (about % natural size). 



