350 



Pycnodus robustus. 



Leidy : Pr. Ac. Nat. Sc. 1857, 108. 

 Noticed page 293, and represented by Figs. 18, 19, Plate XXXVII. From 

 the Cretaceous of New Jersey. 

 Pycnodus carolinensis. 



Emmons: North Caroliua Geol. Sur. 1858, 244, Fig. 90. 

 Noticed page 294. From the Miocene of North Carolina. 



HADRODUS. 



Hadrodus priscus. 



Leidy : Pr. Ac. Nat, Sc. 1857, 107. 

 Described page 294, and represented by Figs. 17 to 20, Plate XIX. From 

 the Cretaceous of Mississippi. Specimen discovered by Dr. William 

 Spill man. 

 Since the determination of the reptilian character of the genus Placodus, 

 I have suspected that this one may also belong to the same order. 



Placoganoidei. 



ACIPENSER. 



ACIPENSER ORNATUS. 



Leidy: Pr. Ac. Nat. Sc. 1873, 15; Am. Jour. Sc. 1873, 312. 

 Among the fossils in Mr. C- M. Smith's collection from the Miocene forma- 

 tion of Virginia, previously mentioned, there is a dermal plate of a stur- 

 geon, especially interesting on account of the rarity of the remains of 

 fishes of the same family. 

 The specimen is represented of the natural size in Fig. 58, Plate XXXII, 

 and is nearly entire. It appears to have been one of the lateral plates, and 

 indicates a species about the size of our common sturgeon of the Delaware 

 River. Though exhibiting no positive distinctive character, it most probably 

 pertained to a species now extinct. 



ELASMOBRANCHI. 



Holocephali. 

 Edaphodontid^. 



EDAPHODON. 



Edaphodon mirificus. 



Leidy : Pr. Ac. Nat. Sc. 1850, 221. 

 Described page 306, and represented by Figs. 6 to 12, Plate XXXVII. 

 From the Cretaceous of New Jersey. 



