32 



PISCES 



serrated lateral borders. Vertebral centra tuith four radiating ridges which tuiden 

 outtoards. Tertiary and Recent. 



Hemijmstis, Ag. (Dirrhizodon, Klunzinger), (Fig. 59). Principal teeth 

 large, triangular 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. curvatus, Dames, from Oligocene, Birket- 

 el-Qurun, Egypt. One existing species. 



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

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



X' 



--<^ 



Fio. ail. 



Jlc'iiUjiristis sfrrri. Ail 

 Neudorfl, Hungaiy. 



i!0. 



A, Tooth of Cnleocenlo lulitncus, A^'. 

 Pliocene (Molasse) ; Pfiillendorf, Biden. 

 B, Section of vertebra of Galeocerdo. 

 Miocene (Molasse) ; Baltringen (after 

 Hasse). 



Galeus affinis, Probst. 

 Miocene (Molasse) ; Bal- 

 ti-ingen (after Probst.). 



from Bracklesham Beds and Maryland Miocene, 

 species, apparently ranging to the Pliocene. 

 triquetcr, East., from the American Miocene. 



Alopiojms, Lio\% and Fseudogaleus, Jaekel. 

 Upper Eocene, Monte Bolca, near Verona. 



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



G. ad uncus, Ag. (Fig. 60, A), 

 G. contortus, Gibbes, and G. 



Nearly complete fishes from 



Teeth small and oblique, the 

 ixiargins only serrated at the 

 base, and a deep notch pos- 

 teriorly. Eocene to Recent. 



Carcharias, Ciiv. (Fig. 62). 

 Teeth mostly oblique and tri- 

 angular, without lateral denticles, 

 usually different in the two jaws. 

 The lateral edges serrated to 

 the apex (Prionodon, Miiller 

 and Henle) or only at the base 

 {Hijpuprion, 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. 



JIustelus, Cuv. ; Triiienodon, Triads, ]\I. ami H. Recent. 



Fi»i. 62. 



.1, t'arcliuilu.< (Aprionodon) finiULiis. 1 fames. EociMn- 

 Birket-el-Qurun, Egypt (after Dames). J!, Ccirhurius (IJi/jju- 

 prion) ainijtduris, Probst. C, Carcharins (SrUiodon) kntu.isl, 

 Probst. D, CarrlmrUis (Prionodon) similit:, Probst. Mioceni 

 (Molasse) ; Baltringen (after Prob.st.). 



Family 4. Laranidae. Miiller and Henle. 



Dorsal jins without spines, tlie anterior situated opposite to the space between the 

 oral and pelvic fins. Teeth pointed and usually large, with or without lateral 



