54 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 6a 



Plate 2 



Dorsal view of skull of Kentriodon pernlx. Cat. No. 8060, U.S.N.M. About 

 three-fifths natural size. Allowance must be made for distortion, because this is 

 a photograph of the image of the dorsal surface in the mirror back of the skulL 

 on the skeleton now on exhibition. 



Plate 3 



Fig. 1, Posterior view of skull of Kentriodon pernix. Cat. No. 10670. 

 U.S.N.M. About eight-elevenths natural size. Left periotic, about seven-thirds, 

 natural size. Fig. 2, Tympanic or ventral view ; Fig. 3, External view ; Fig. 4^ 

 Cerebral or internal view. 



Plate 4 



Ventral view of skull and cervical vertebrae of Kentriodon pernix. Cat. No. 

 8060, U.S.N.M. About one-half natural size. 



Plate 5 



Lateral views of skulls of Kentriodon pernix. About eleven-twentieths natu- 

 ral size. Fig. 1, Skull, Cat. No. 8060, U.S.N.M. ; Fig. 2, Skull, Cat. No. 10670, 

 U.S.N.M. 



Plate 6 



Dorsal view of skull of Kentriodon pernix. Cat. No. 10670, U.S.N.M. About 

 eleven-twentieths natui'al size. 



Plate 7 



Ventral view of skull of Kentriodon pernix. Cat. No. 10670, U.S.N.M. 

 About eleven-twentieths natural size. 



Plate 8 



Views of seven teeth of Kentriodon pernix. Cat. No. 8060, U.S.N.M. About 

 three times natural size. Fig. 1, Anteriormost tooth in mandible ; Fig. 2, Tooth 

 from anterior end of middle portion of tooth row ; Fig. 3, Tooth from posterior 

 end of middle portion of tooth row ; Figs. 4-7, Teeth from near anterior end of 

 tooth row. 



Plate 9 



Lateral views of posterior dorsals and anterior lumbars of Kentriodon pernix. 

 Cat. No. 8060, U.S.N.M. About natural size. Fig. 1, Eighth dorsal, par- 

 tially concealed by shafts of fifth and eighth ribs ; Fig. 2, Ninth dorsal, par- 

 tially concealed by shafts of fifth, eighth, and ninth ribs, and with extremity 

 of neural spine restored ; Fig. 3, Tenth dorsal, partially concealed by extremity 

 of ninth rib, and with right transverse process and extremity of neural spine 

 restored ; Fig. 4, First lumbar, with extremity of neural spine and right trans- 

 verse process restored ; Fig. 5, Second lumbar, with extremity of neural spine 

 and right transverse process restored ; Fig. 6, Third lumbar, with centrum, right 

 neurapophysis, and right transverse process restored. 



