EXPLANATION OF PLATES. 



PLATE 1. 



(All figures are of the natural size.) 



Figs. 1-4. Carcharias (Prionodon) sp. hid., Station 2. All of these specimens are seen 



from the inner or convex face ; the original of Fig. 1 is an anterior lower 

 tooth, and the remainder are postero-lateral teeth referable to the upper 

 dentition. 

 " 5, 6. Carcharias (Prionodon) sp. hid., Station 13. Inner face of an anterior and 

 an antero-lateral tooth of a small species possibly distinct from that illus- 

 trated in Figs. 1-4. 

 " 7, 8. Hemipristis sp. inch, Station 2. Inner face of two much decomposed crowns. 

 " 9, 10. Lamna sp. ind., Station 2. Two anterior teeth of a small species seen in 

 profile and from the inner or posterior aspect. 

 Fig. 11. Oxyrhina crassa Ag., Station 2. Inner face of a small anterior tooth. 



Figs. 12, 13. Oxyrhina crassa Ag., Station 2. Inner face of two large anterior teeth. 

 " 14-18. Oxyrhina crassa Ag., Station 2. Average-sized examples of the postero- 

 lateral dentition. 

 Fig. 19. Oxyrhina crassa Ag., Station 13. Inner face of a large specimen belonging 



to the lateral series. 

 " 20. Oxyrhina crassa Ag., Station 2. A rather heavily encrusted lateral tooth 



corresponding in size to the anterior teeth shown in Figs. 12 and 13. 

 Figs. 21-23. Carcharodon megalodon Ag., Station 2. Rather lightly encrusted lateral teeth. 

 Fig. 24. Supposed Cetacean incus from Station 2 ; also shown in PI. 2, fig. 30. 



PLATE 2. 



(All figures are of the natural size.) 



Fig. 25. Eight petrous bone of Globicephalus (?). Station 2. 



" 26. Left tympanic and petrous bones still retained in natural association and 



apparently referable to Globicephalus. Station 13. 



" 27. Left tympauo-pteriotic of Globicephalus (?). Station 2. 



" 28. Left petrous bone of a Ziphioid whale. Station 2. 



" 29. Left tympano-§jteriotic of a Ziphioid whale. Station 13. 



" 30. Supposed Cetacean incus, also shown in PI. 1, fig. 24. Station 2. 



" 31. Carcharodon megalodon, Ag., Station 173. A comparatively large-sized and 



very heavily encrusted specimen. 



" 32. Carcharodon, megalodon, Ag., Station 173. A lateral tooth having a moder- 



ately thin coating of manganese on the outer face, and a very thick deposit 

 on the inner, which presumably lay uppermost. 



" 33. Carcharodon megalodon Ag., Station 173. A lateral tooth evidently buried 



in reverse positiou to that shown in the preceding figure. 



PLATE 3. 



Track of the " Albatross " from San Francisco to Yokohama, 



191 



