ELASMOBRANCHII. 71 



appears to be the broader base with the lower crown. It has not 

 before been reported from New Jersey. 



Formation and locality. I have eight teeth from near Allo- 

 waystown in Salem County, probably from the Miocene beds (H. 

 C. Yarrow). 



Genus HEMIPRISTIS Agassiz. 



Hemipristis Agassiz, Poiss. Foss., Ill, 1843, pp. 237, 302. Type Hemipristis 

 serra Agassiz, first species, restricted by Woodward, Cat. Foss. Pish. Brit. 

 Mus., I, 1889, p. 450. 



Dirrhizodon Klunzinger, Verh. Z. B. Ges. Wien., XXI, 1871, p. 664. Type 

 Dirrhisodon elongatus Klunzinger, monotypic. 



Body elongated. Teeth elevated, triangular, mostly curved or 

 inclined backward towards apex, both coronal' edges becoming 

 coarsely serrated. Root divided with two divergent branches. 

 Upper teeth relatively large, broad, flat. Front lower teeth 

 slender, subulate, curved inward, without denticles or only one or 

 two minute basal points. Gill-openings wide. First dorsal close 

 behind pectoral base. Second dorsal over anal. Caudal with 

 upper lobe much longer, notched near end. 



A single living species in the Red Sea, and seven extinct species 

 have been described. 



Hemipristis serra Agassiz. 



Hemipristis serra Cope, Proc. Amer. Philos. Soc. Phila., XIV, 1875, p. 362. 

 (Cumberland Co. Miocene.) 



Lateral teeth broadly triangular, well compressed, and with 

 moderate thickness. Crown elevated, well compressed, falcate, 

 surfaces convex, but outer slightly flattened, and smooth. Some- 

 times a few short basal wrinkles vertically on outer surface. 

 Cutting-edges strongly serrated, serrse becoming slightly en- 

 larged, or remaining subequal in size well on apex, though not 

 extending to its tip. Apex usually strongly deflected laterally, 

 usually inner serrse more numerous and much smaller than those 

 on external edge. Often surfaces of crown are slightly twisted 

 or undulated in places, giving quite irregular profiles. No basal 

 cusps. Root well compressed, inner surface often flattened or 



