Cope.] 310 [February 17, 



Descriptions of some Extinct Fishes previously unknown. 

 By E. D. Cope. 



TELEOSTEI. 



Histiophorus homalorhamphus Cope.i 



Established on an osseous muzzle procured by Wm. S. Vaiix, 

 from the Eocene or Miocene Green-sand of the neighborhood of 

 Squankura, New Jersey, with a portion of the muzzle of Calorhync- 

 lus ornatus Leidy. Form nearly cylindrical, with a slight depression; 

 the transverse diameter (one inch) exceeding the vertical by less than 

 one eighth of the former. Dentigerous inferior bands not separated 

 by a groove, width of each two thirds the lesser diameter; each forms 

 with the other a strong, but obtuse angle, and is basally flattened, 

 then curved upwards at the external margin. Alveolos numerous, 

 small, five in the tenth of an inch. The base is broken, but the 

 longer diameter is 4.66 of the length. Surface of the bone not den- 

 tigerous, with numerous anastomosing strias. Total length 4.4 inches. 



Four extinct species of this genus of sword fishes have been de- 

 scribed; the H. iwiscus Agass., from the London clay, the beak of 

 which is not known; H. minor Agass., which Is deeply fluted, and H. 

 robustus Leidy (Post-pliocene Foss. S. Car., 119, Xiphluft), which Is 

 from the Post-jiliocene of Ashley River, S. Carolina; it is much de- 

 pressed, the dentigerous surface is a continuous plane, separated by a 

 deep groove. The H. anfiquus (^Xiphias Leidy), from the New Jersey 

 Eocene, is also a more depressed species, with the dentary surfaces 

 on one plane. 



Pogonias multidentatus Cop6. 



This S2iecies is indicated by a left superior pharjTigeal bone, with 

 the dental scars and several successional teeth In their respective 

 alveolfB. The form of the bone is an elongate oval, the inner free 

 margin many times heavier than the outer, and strongly bevelled. 

 The inner edge is slightly broken away. The general form is that of 

 the Pogonias chromis, now living on om- coasts; the size is one third 

 less, and the number of teeth in the same area, relatively, consider- 

 ably greater. The inner series has consisted of seven teeth, of which 

 the median three were larger ; all but the terminals had parallelo- 

 grammlc bases. Of the second row nearly seven enter an inch, and 

 on the outer edge seven enter a half inch. The sizes graduate from 

 the Inner series, and If there have been any brush-like teeth, as in 

 /*. cliromis, their bases have been broken away. On the middle of 



1 Proc. Acad. Nat. Sc. Philad., 1855, 414. 



