188 



EXPEDITION OF THE "ALBATROSS," 1899-1900. 



onal margin is well shown in the accompanying text- 

 figure 4, which represents the outer face of the same 

 specimen as shown in PI. 1, fig. 4. It is evidently 

 with the group represented by Prionodon that five 

 small serrated teeth from Station 2 and three some- 

 what similar ones from Station 13 belong, but a closer 

 identification than this appears impossible. The nar- 

 row erect teeth shown in PI. 1, figs. 1 and 5, are 

 evidently anterior and lower in position, and those 

 shown in Figs. 2, 3, 4, and 6 are by the same token 

 postero-lateral teeth belontrinyr to the upper iaw. 



Station 2. Outer face l ° ° 1 1 J 



of same specimen shown The originals of Figs. 1-4 are all from Station 2, and 

 in PL i, fig. 4. x *. possibly represent a distinct species from those shown 



in Fio;s. 5 and 6, which are from Station 13. All these teeth asrree in their 

 considerable thickness with certain Miocene species rather than with most 

 existing forms. 



Pig. 4. — Carcharias sp. ind. 



Hemipristis Agassiz. 



Plate 1, Figs. 7, 8. 



This genus comprises several Tertiary and one still living species, the 

 latter being an inhabitant of the Red Sea. The teeth are readily distin- 

 guishable from those of Galeus, Galeocerdo, Carcharias, 

 ami the like by the peculiar denticulation of their 

 coronal margins. In PI. 1, figs. 7 and 8, are shown 

 two teeth belonging to an unidentified species of 

 Hemipristis, both from Station 2. An enlarged view 

 showing the serrations of the coronal margin is given 

 in the accompanying text-figure 5. Two Hemipristis 

 teetli were also obtained by the " Challenger" Expe- 

 dition, and are figured in the volume on Deep-Sea Deposits, PI. V., figs. 

 10 and 11. Figs. 8 and 9 of the same plate are probably of Carcharias 

 teeth. 



Fig. 5. — Hemipristis sp. ind. 

 Station 2. Inner face 

 of same specimen shown 

 in PI. 1, fig. 8. X \- 



