32 



PISCES 



CLASS I 



serrated lateral hm'ders, Vertehral cerdra with four radiating ridges which widen 

 outwards. Tertiary and Recent. 



Hemipristis, Ag. (JDirrhizodon, Klunzinger), (Fig. 59). Principal teeth 

 large, triangulär and compressed, with coarsely serrated edges ; anterior 

 lower teeth slender, subulate, inwardly curved, and without denticulations or 

 with one or two minute points at the base. H. serra, Ag. (Fig. 59), common 

 in the Miocene of Europe and in the Tertiary Phosphate Beds of South 

 Carolina and Maryland Miocene. H. ciirvatus, Dames, from Oligocene, Birket- 

 el-Qurün, Egypt. One existing species. 



Galeocerdo, Müller and Henle (Fig. 60). Teeth oblique, serrated on both 

 margins, with a deep notch posteriorly. Eocene to Recent. G. latidens, Ag., 



J'io. 59. 



Hemipristis serni, Ag. 

 Neudörtt, Hungarj'. 



Miocene ; 



Fig. 60. 



A, Tooth of Galeocerdo aduncus, Ag. 

 Miocene (Molasse) ; PfuUendorf, Baden. 

 B, Section of vertebra of Galeocerdo. 

 Miocene (Molasse) ; Baltringen (after 

 Hasse). 



m9b 



Fig. 61. 



Galeus aßnis, Probst. 

 Miocene (Molasse) ; Bal- 

 tringen (after Probst.). 



from Bracklesham Beds and Maryland Miocene. 

 species, apparently ranging to the Pliocene. 

 triqueter, East., from the American Miocene. 



Alopiopsis, Lioy, and Fsevdogaleus, Jaekel. 

 Upper Eocene, Monte Bolca, near Verona. 



Galeus, Ag. (Protogaleus, Molin.), (Fig. 61). 



G. aduncus, Ag. (Fig. 60, ^), 

 G. contortus, Gibbes, and G. 



Nearly complete fishes from 



J^ Ä <wbi 



Fig. 62. 



Teeth small and oblique, the 

 margins only serrated at the 

 base, and a deep notch pos- 

 teriorly. Eocene to Recent. 



Carcharias, Cuv. (Fig. 62). 

 Teeth mostly oblique and tri- 

 angulär, without lateral denticles, 

 usually difFerent in the two jaws. 



A, Carcharias (Aprionodon) frequens, Dames. Eocene; The lateral edgCS SCrratcd tO 



Birket-el-Qurun, Egypt (after Dames). B, Carcharias (Hypo- .v^ „^^,, / D .'^ ^ at-ii 



pHon) singiUans, Probst. C, Carcharias (Scoliodon) kraussi, ^üe apex {Fnonodon, Mullcr 



Probst. D, Carcharias (Prionodon) similis, Probst. Miocene onH TTpnlp\ nv c\W\\t af f>io Kqoo 



(Molasse) ; Baltringen (after Probst.). '^"^ Xienie; or Oniy at tüe Dase 



{Hypoprion, M. and H.), or sharp- 

 edged but not serrated {Scoliodon, Physodon, M. and H.), sometimes also erect 

 and sharp-edged {Aprionodon, Gill). Tertiary and Recent. 



Sphyrna, Raf. {Zygaena, Cuv.). Hammerhead sharks. Tertiary and Recent. 

 S. prisca, Ag. 



Mustelus, Cuv. ; Triaenodon, Triacis, M. and H. Recent. 



Family 4. Lamnidae. Müller and Henle. 



Dorsal fins without spines, the anterior situated opposite to the space bettveen the 

 pectoral and pelvic fins. Teeth pointed and usually large, with or tuithout lateral 



