188 



EXPEDITION OF THE '• ALBATROSS," 1899-1900. 



onal margin is well shown in tlie Jicconipanjing toxt- 

 figure 4, which represents the outer fiice 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 1.3 belong, but a closer 

 identification than this appears impo.ssible. 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 

 !(,. .— a)r«(im,ssp. lilt. pQ^tgro-lateral teeth belonging to tlie upper iaw. 



Station 2. Outer face ' ° ° I I J 



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

 in PI. 1, fig. 4. X }. po.ssibly represent a distinct species from tlio.se shown 



in Figs. 5 and 6, which are from Station 13. All these teeth agree in their 

 considerable thickness with certain Miocene sjjecies rather than with most 

 existing forms. 



Hemipristis Agassiz. 



Plate 1, Figs. 7, S. 



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



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

 guishable from those of Galeus, Galeocerdo, Carcharias, 

 and the like by the peculiar denticulation of their 

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

 two teeth belonging to an unidentified species of 

 Hemipristis, both from Station 2. An enlarged view 

 sliowing the .serrations of the coronal margin is given 

 in the accompanying text-figure 5. Two Hemipristis 

 teeth were also obtained by the " Challenger " Expe- 



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



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



teeth. 



Fig. .5. — fleutlj/ritlis sp. iiid. 

 Station 2. Inner faco 

 of same specimen shown 

 in PI. 1, fig. S. X }. 



